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CN119203860A - A Synchronizable Adaptive On-Time Generator Circuit in a Wide Frequency Range - Google Patents

A Synchronizable Adaptive On-Time Generator Circuit in a Wide Frequency Range Download PDF

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Publication number
CN119203860A
CN119203860A CN202411335803.2A CN202411335803A CN119203860A CN 119203860 A CN119203860 A CN 119203860A CN 202411335803 A CN202411335803 A CN 202411335803A CN 119203860 A CN119203860 A CN 119203860A
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circuit
current
voltage
frequency
resistor
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Inventor
陈庆
郝明
林叶
胡正海
田宇凡
蒲长意
曾泫鸿
尹文波
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Jiangsu Huachuang Micro System Co ltd
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Jiangsu Huachuang Micro System Co ltd
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Priority to CN202411335803.2A priority Critical patent/CN119203860A/en
Publication of CN119203860A publication Critical patent/CN119203860A/en
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/30—Circuit design
    • G06F30/32—Circuit design at the digital level
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/38—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
    • G06F7/48—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
    • G06F7/52—Multiplying; Dividing
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/081—Details of the phase-locked loop provided with an additional controlled phase shifter
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
    • H03L7/0891—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses the up-down pulses controlling source and sink current generators, e.g. a charge pump
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
    • H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
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  • Pure & Applied Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Computational Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • Evolutionary Computation (AREA)
  • Geometry (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

The invention discloses a synchronous self-adaptive conduction time generation circuit in a wide frequency range, which utilizes a multiplier to combine a reference frequency, a current proportional to the reference frequency and a signal of a sampling circuit to generate a filling current of a ramp wave generation circuit, and utilizes a comparator, a latch and a loop of the ramp wave generation circuit to regulate the conduction time of a MOS tube. The invention tunes the on-time by introducing an external reference frequency variable, so that the switching frequency can be synchronized by the external frequency, the switching frequency can be accurately maintained unchanged under the condition of stable load and is not influenced by the nonlinearity and the matching precision of the circuit, moreover, the ramp current generating the on-time can be inversely proportional to the frequency and the phase difference to improve the tuning gain of the on-time, the frequency synchronization range is also improved, and the input and output voltage range of the whole architecture application is widened.

Description

Synchronous self-adaptive on time generation circuit in wide frequency range
Technical Field
The invention relates to the technical field of integrated circuit design, in particular to a synchronous self-adaptive on-time generation circuit in a wide frequency range.
Background
The adaptive on-time circuit is a relatively common structure in a power control system, for example, in a dc-dc inductance capacitance type step-down power system, and is used for generating a fixed on-time inversely proportional to an input voltage and directly proportional to an output voltage, so as to control the on-time of an upper power tube. Since the switching period is proportional to the on-time of the upper power transistor and the input voltage and inversely proportional to the output voltage in the continuous current mode in the lc buck system, the switching period is also fixed over a range of loads when an adaptive on-time circuit is employed, and the overall system is commonly referred to as a pseudo-constant frequency control system.
At present, a BUCK circuit with a self-adaptive on-time function generally comprises an input/output sampling circuit, a ramp wave generating circuit and a comparison circuit, when the BUCK circuit works in a continuous mode, the BUCK circuit can be obtained according to the output voltage and the input voltage, wherein the switching period of a system is the switching period of the system, namely the inverse of the switching frequency of the system, and the switching frequency can be obtained. The system has the advantages of rapid load transient response in a frequency modulation mode, and can keep the system frequency unchanged basically when the input and the output are stable. But this circuit has the following drawbacks in generating on-time:
1) The switching frequency is unstable:
When the input/output voltage variation range is relatively large, especially under extreme conditions, such as the condition that the input voltage is highest and the output voltage is lowest or the condition that the input voltage is lowest and the output voltage is highest, the on-time cannot be changed in a nonlinear manner, so that the switching frequency cannot be kept constant within the full voltage range;
2) The frequencies between different chips are difficult to be consistent:
Non-ideal factors on circuit design include offset voltage of an operational amplifier, matching performance of a resistor and an MOS device, and the like, which can lead to certain deviation of switching frequency between different chips even under the same input and output conditions, namely, the frequency between the chips cannot be guaranteed to be completely consistent;
3) The switching frequency range is small and the selectable device range is small:
After the internal correlation coefficient of the chip is designed, for example, the ratio of R2 to R1, the ratio of R3 to R4, and the value of Gm1 are designed, the switching frequency of the chip is also designed within a small frequency range, and the switching frequency cannot be modified at will according to the requirement of the user, which further limits the type selection range of the peripheral devices of the user.
Disclosure of Invention
Aiming at the three problems, the invention aims to provide a synchronous self-adaptive on-time generation circuit in a wide frequency range, which can lead the switching frequency of a system to be synchronous by external frequency by introducing external reference frequency variable, can accurately maintain the switching frequency unchanged under the condition of stable load, is not influenced by nonlinearity and matching precision of a circuit, is convenient for device type selection, can improve the tuning gain of the on-time by inversely proportional to frequency and phase difference of ramp current for generating the on-time, also improves the frequency synchronous range, widens the input and output voltage range of the application of the whole architecture, reduces the range requirement on loop control voltage, and greatly reduces the problems of continuous frequency conversion and smaller range caused by circuit nonideal factors.
The method is realized by the following technical scheme:
An adaptive on-time generation circuit capable of synchronizing IN a wide frequency range is used for frequency synchronization of a power supply system and an external system and comprises an external current introduction module, a multiplier, a ramp wave generation circuit, an input sampling circuit, an output sampling circuit, a voltage-to-current conversion circuit 1, an external introduction circuit, a comparator and an SR latch, wherein the external current introduction module is used for receiving the switching frequency of the power supply system and the reference frequency of the external system and generating a current I_PHASE, transmitting the current I_PHASE to an IN3 input end of the multiplier, the input sampling circuit is used for receiving an input voltage VIN and generating VINO signals, converting VINO signals into the current I_VIN through the voltage-to-current conversion circuit 1 and transmitting the current I_VIN to an IN1 input end of the multiplier, the external introduction circuit adopts a first direct current source to transmit the current I_OSC which is proportional to the reference frequency to an IN2 input end of the multiplier, and an output end of the multiplier outputs The output end of the comparator is connected with the ramp wave generating circuit through the SR latch, and the SR latch is used for outputting the conduction time of the MOS tube.
The synchronous switching frequency control circuit has the advantages that the external current introduction module is additionally arranged, so that the synchronous switching frequency function can be realized by introducing information of reference frequency or phase difference with the outside while the on-time is generated, the defect that a user cannot customize the switching frequency in the traditional self-adaptive on-time module is overcome, the switching frequency can be accurately maintained unchanged under the condition of stable load and is not influenced by nonlinearity and matching precision of a circuit, the synchronous switching frequency control circuit can greatly increase the synchronous frequency range by introducing the current I_OSC which is in direct proportion to the reference frequency, so that the on-time can be adjusted in a wide frequency range, and in addition, the ramp wave generation circuit is utilized for tuning, so that the on-time is effectively controlled.
Preferably, the external current introducing module comprises a PHASE frequency detector, a charge pump, a loop filter circuit and a voltage-to-current circuit 2, wherein the input end of the PHASE frequency detector receives the switching frequency of the power supply system and the reference frequency of an external system, the output end drives the charge pump to generate a control voltage VCTRL, the loop filter circuit is used for carrying out loop filtering on the control voltage VCTRL, and the voltage-to-current circuit 2 converts the control voltage VCTRL subjected to loop filtering into a current I_PHASE. The phase frequency detector can effectively acquire the phase difference and the frequency difference, and further can generate control voltage together with the charge pump so as to adjust the frequency and the phase of the two systems to be consistent.
Preferably, the loop filter circuit includes a resistor R6, a capacitor C2 and a capacitor C3, wherein a first end of the resistor R6 is connected in parallel between the charge pump and the voltage-to-current circuit 2, a second end of the resistor R6 is grounded through the capacitor C2, and the capacitor C3 is connected in parallel between the capacitor C2 and the ground and between the charge pump and the voltage-to-current circuit 2. The loop filter circuit can effectively filter noise and smooth signals, so that signals introduced by the external current introduction module are more stable.
The ramp wave generating circuit comprises a second direct current source, an MOS tube and a capacitor C1, wherein the capacitor C1 is grounded, the second direct current source receives AVDD power and is connected with the output end of the multiplier for generating a current I_SLOPE, the current I_SLOPE flows through the capacitor C1 to generate a ramp wave voltage signal V_SLOPE, the positive input end of the comparator receives the ramp wave voltage signal V_SLOPE, the drain electrode of the MOS tube is connected between the second direct current source and the capacitor C1, the source electrode of the MOS tube is connected between the capacitor C1 and the ground, and the grid electrode of the MOS tube is connected to the output end of the SR latch. The ramp wave generating circuit adopts the MOS tube to adjust ramp wave voltage signals, so that tuning gain of on time can be improved, frequency synchronization range is effectively improved, and input voltage and output voltage range of the whole circuit are widened.
The input sampling circuit and the output sampling circuit are both in a resistor voltage division structure, the input sampling circuit comprises an input voltage VIN, a resistor R1 and a resistor R2 which are sequentially connected, the resistor R2 is grounded, the voltage-to-current circuit 1 is connected between the resistor R1 and the resistor R2, the output sampling circuit comprises an output voltage VOUT, a resistor R3 and a resistor R4 which are sequentially connected, the resistor R4 is grounded, and a negative input end of the comparator is connected between the resistor R3 and the resistor R4. The adoption of the resistor voltage division structure can simplify the design and is easy to adjust the voltage division proportion.
Preferably, the voltage-to-current circuit 1 is of the type employing a resistive switching circuit or an operational amplifier switching circuit. The resistance type conversion circuit has low cost, and the operational amplifier type conversion circuit has high precision and is convenient to control.
Compared with the prior art, the invention has the following beneficial effects:
The invention has the advantages that the switching frequency of the system can be synchronized by the external frequency by introducing the external reference frequency variable to tune the on-time, the switching frequency can be accurately maintained unchanged under the condition of stable load, the nonlinear and matching precision of the circuit are not influenced, the device model selection is convenient, the ramp wave current generating the on-time can be inversely proportional to the frequency and the phase difference to improve the tuning gain of the on-time, the frequency synchronization range is also improved, the input and output voltage range of the whole architecture application is widened, the range requirement on loop control voltage is reduced, and the problems of continuous frequency conversion and smaller range caused by the circuit nonideal factor are greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a synchronous adaptive on-time generation circuit over a wide frequency range;
FIG. 2 is a schematic diagram of a waveform of frequency synchronization in a synchronous adaptive on-time generation circuit over a wide frequency range;
fig. 3 is a waveform diagram showing the synchronization of a switching frequency and three corresponding voltage waveforms.
Detailed Description
The following describes the technical solution in the embodiment of the present invention in detail with reference to the drawings in the embodiment of the present invention.
As shown in fig. 1, a schematic diagram of a synchronous adaptive on-time generation circuit in a wide frequency range is provided, which is used for frequency synchronization of a power supply system and an external system, and comprises an external current introduction module, a multiplier, a ramp wave generation circuit, an input sampling circuit, an output sampling circuit, a voltage-to-current conversion circuit 1, an external introduction circuit, a comparator and an SR latch, wherein parameters of the external current introduction module and the external introduction circuit are introduced through the multiplier to increase the frequency synchronization function and widen the frequency range.
IN this embodiment, the external current introducing module is configured to receive the switching frequency of the power supply system and the reference frequency of the external system, generate a current i_phase, and transmit the current i_phase to the IN3 input terminal of the multiplier. Specifically, the external current introduction module includes a phase frequency detector, a charge pump, a loop filter circuit, and a voltage-to-current circuit 2. The input end CLK_REF of the phase frequency detector receives the switching frequency F SW of the power supply system, the input end CLK_DIV of the phase frequency detector receives the reference frequency F OSC of an external system, the frequency difference or the phase difference of the two frequencies is obtained, and the charge pump can be driven to work at the output end based on the frequency difference or the phase difference to generate the control voltage VCTRL. The voltage-to-current circuit 1 and the voltage-to-current circuit 2 may each be of a resistive type conversion circuit or an operational amplifier type conversion circuit. Aiming at the two conversion circuits, the resistance type conversion circuit has low cost and wide application, the operational amplifier type conversion circuit has high precision and is convenient to control, and a user can freely select from the two schemes. The specific structures of the resistor-type conversion circuit and the operational amplifier-type conversion circuit are not described in detail herein, and the corresponding scheme is already mature at present and can be selected from the existing schemes.
The loop filter circuit is used for carrying out loop filter on the control voltage VCTRL, effectively filtering noise and smoothing signals, and enabling the control voltage signal introduced by the external current introduction module to be more stable and gentle. Specifically, the loop filter circuit may have a structure in which a first end of the resistor R6 is connected in parallel between the charge pump and the voltage-to-current circuit 2, a second end of the resistor R6 is grounded AGND through the capacitor C2 to form an RC filter, and the capacitor C3 is connected in parallel between the capacitor C2 and ground and between the charge pump and the voltage-to-current circuit 2 to perform high-frequency filtering. The voltage-to-current circuit 2 converts the loop-filtered control voltage VCTRL into a current i_phase, which is introduced into the IN3 input of the multiplier.
At the same time, the external lead-IN circuit uses a first direct current source connected to ground to transmit a current i_osc proportional to the reference frequency to the IN2 input of the multiplier.
The input sampling circuit is used for receiving an input voltage VIN and generating VINO signals, converting VINO signals into a current I_VIN through the voltage-to-current circuit 1 and transmitting the current I_VIN to an IN1 input end of the multiplier. The input sampling circuit adopts a resistor voltage division structure, so that the design can be simplified, and the voltage division proportion can be easily adjusted. In the input sampling circuit, a resistor R1 is connected to a power supply VIN, a resistor R2 is grounded, and a voltage-to-current circuit 1 is connected between the resistor R1 and the resistor R2. The input voltage VIN generates VINO signals through the input sampling circuit, VINO signals generate current i_vin proportional to the input voltage signal VIN through the voltage-to-current module 1, and the current i_vin flows into the IN1 port of the multiplier.
Thus, the multiplier can output at the output terminal based on the signals obtained from the three input terminalsThe output end of the multiplier is connected to the ramp wave generating circuit, so as to generate a current filling to control the on time.
In this embodiment, the ramp generating circuit generates a ramp current for controlling the on-time based on IOUT by using the MOS transistor. The ramp wave generating circuit comprises a second direct current source, an MOS tube and a capacitor C1, wherein the capacitor C1 is grounded, the second direct current source receives AVDD power and is connected with the output end of the multiplier for generating a current I_SLOPE, the current I_SLOPE flows through the capacitor C1 to generate a ramp wave voltage signal V_SLOPE, the forward input end of the comparator receives the ramp wave voltage signal V_SLOPE, the drain electrode of the MOS tube is connected between the second direct current source and the capacitor C1, the source electrode of the MOS tube is connected between the capacitor C1 and the ground, and the grid electrode of the MOS tube is connected to the output end of the SR latch. The ramp wave generating circuit adopts the MOS tube to adjust ramp wave voltage signals, so that tuning gain of on time can be improved, frequency synchronization range is effectively improved, and input voltage and output voltage range of the whole circuit are widened.
The three signals i_phase, i_vin and i_osc generate a current i_slope after passing through the multiplier, the current i_slope flows through the capacitor C1 to generate a ramp voltage signal v_slope, the drain of the MOS transistor MN0 is connected to the upper plate of C1, the source is connected to ground with the end of the capacitor C1, and the gate is connected to the output VDRN of the subsequent SR latch to form a closed loop for periodic reset of the whole module. IN the application, the current I_PHASE which is IN direct proportion to the frequency or the PHASE difference is specially connected to the IN3 end of the multiplier, namely the inverse relation between the output current I_SLOPE of the multiplier and the I_PHASE is used for further increasing the tuning gain of the equivalent voltage-controlled oscillator, thereby ensuring that the switching frequency can be always locked with the external frequency.
It should be noted that the sink current actually refers to a current that charges the capacitor C1, and may also be referred to herein as a ramp current, because when the current passes through the capacitor C1, charge is accumulated on the capacitor, thereby generating a voltage that varies linearly with time across the capacitor, that is, a ramp voltage v_slope. When a current i_slope flows through the capacitor C1, it gradually increases the voltage across the capacitor, forming a ramp-shaped waveform, i.e. the current is used to generate the ramp voltage signal.
The positive terminal of the comparator is connected with the ramp voltage signal V_SLOPE voltage, and the negative terminal of the comparator is connected with the output sampling terminal VOUT0. The output sampling circuit also adopts a resistor voltage division structure, wherein a resistor R3 is connected with an output voltage VOUT, a resistor R4 is grounded, and a negative input end of the comparator is connected between the resistor R3 and the resistor R4 to obtain a voltage VOUTO. The output end of the comparator is connected with the reset end R of the SR latch, the set end S of the SR latch is connected with a short pulse signal VCOMP for starting the upper power tube in the power supply system, and the pulse width of the output signal VDR of the SR latch is the on time of the upper power tube in the whole power supply system.
The whole module of the application is integrated into a power supply system and can be equivalent to a phase-locked loop system, and the switching frequency Fsw of the power supply system can be in the same frequency and phase with the external frequency Fosc through a feedback principle. If the system switching frequency Fsw is higher than the external frequency Fosc, the loop control voltage VCTRL becomes high and thus the i_phase becomes high, and since i_ SLPOE is inversely proportional to i_phase, the on-time becomes large and thus the system switching frequency Fsw is reduced, and the system is not stable until Fsw is the same as Fosc in frequency and PHASE. On the other hand, if the system switching frequency Fsw is lower than the external frequency Fosc, the loop control voltage VCTRL becomes lower, and thus the i_phase becomes smaller, and since i_ SLPOE is inversely proportional to the i_phase, the on-time becomes smaller, and thus the system switching frequency Fsw is increased, and the system is not stable until Fsw is the same as Fosc in frequency and PHASE.
As shown in fig. 2, a waveform diagram of frequency synchronization in a synchronous adaptive on-time generation circuit in a wide frequency range is shown, so long as the external frequency Fosc is unchanged, the switching frequency Fsw of the power supply can also be kept constant, and the control voltage VCTRL, the current i_phase and the current i_slope can also be kept stable.
Similarly, as shown in fig. 3, a waveform diagram of the switching frequency synchronized with the waveforms of the corresponding three voltages is shown, where t represents time, and the short pulse signal VCOMP, the voltage VOUTO, the voltage v_slope, and the output signal VDR of the latch remain stable on the basis of the stable switching frequency F SW.
In the synchronous self-adaptive on-time module in the wide frequency range, the generation of the on-time is not only related to the input voltage and the output voltage, but also realizes the synchronous function of the switching frequency by introducing frequency or phase difference information with external frequency, thereby not only solving the defect that a user cannot customize the switching frequency in the traditional self-adaptive on-time module, but also accurately maintaining the switching frequency unchanged under the condition of stable load, and being not influenced by nonlinearity and matching precision of a circuit because the switching frequency is always synchronous with the external frequency.
Second, the addition of the current information i_osc proportional to the external frequency in the on-time generation module can greatly increase the synchronizable frequency range. When the input and output voltages are fixed, the ratio of the on time to the switching period of the system is the ratio of the output voltage to the input voltage, namely, the higher the switching frequency is, the smaller the on time is, otherwise, the larger the on time is. Therefore, when the variable frequency range of the user's demand is relatively large, it means that the change of the on-time is also large, and i_osc is proportional to the variable frequency, i.e. i_slope is also proportional to the external frequency, whereas the on-time generated in the present application is inversely proportional to the current of i_ SLPOE, so that when the external frequency is higher, the on-time generated in the present application is smaller and is in a fixed linear proportion to the external frequency.
In summary, the invention tunes the on-time by introducing the external reference frequency variable, so that the switching frequency of the system can be synchronized by the external frequency, the switching frequency can be accurately maintained unchanged under the condition of stable load, the influence of nonlinearity and matching precision of a circuit is avoided, the device is convenient to select, the ramp current generating the on-time can be inversely proportional to the frequency and the phase difference to improve the tuning gain of the on-time, the frequency synchronization range is also improved, the input and output voltage range of the whole architecture application is widened, the range requirement on loop control voltage is reduced, the problems of continuous frequency change and smaller range due to circuit nonideal factors are greatly reduced, and the invention has remarkable progress.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereto, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention.

Claims (6)

1. The self-adaptive on-time generation circuit capable of being synchronized in a wide frequency range is used for frequency synchronization of a power supply system and an external system and is characterized by comprising an external current introduction module, a multiplier, a ramp wave generation circuit, an input sampling circuit, an output sampling circuit, a voltage-to-current conversion circuit 1, an external introduction circuit, a comparator and an SR latch;
The external current lead-IN module is used for receiving the switching frequency of the power supply system and the reference frequency of the external system and generating a current I_PHASE, transmitting the current I_PHASE to the IN3 input end of the multiplier, the input sampling circuit is used for receiving an input voltage VIN and generating VINO signals, converting VINO signals into the current I_VIN through the voltage-to-current circuit 1 and transmitting the current I_VIN to the IN1 input end of the multiplier, the external lead-IN circuit adopts a first direct current source and transmits the current I_OSC which is proportional to the reference frequency to the IN2 input end of the multiplier, and the output end of the multiplier outputs The output end of the comparator is connected with the ramp wave generating circuit through the SR latch, and the SR latch is used for outputting the conduction time of the MOS tube.
2. The circuit for generating the self-adaptive on-time capable of being synchronized within a wide frequency range according to claim 1, wherein the external current introducing module comprises a phase frequency detector, a charge pump, a loop filter circuit and a voltage-to-current circuit 2;
The input end of the PHASE frequency detector receives the switching frequency of the power supply system and the reference frequency of an external system, the output end drives the charge pump to generate control voltage VCTRL, the loop filter circuit is used for carrying out loop filtering on the control voltage VCTRL, and the voltage-to-current circuit 2 converts the control voltage VCTRL subjected to the loop filtering into current I_PHASE.
3. The circuit of claim 2, wherein the loop filter circuit comprises a resistor R6, a capacitor C2 and a capacitor C3, wherein a first end of the resistor R6 is connected in parallel between the charge pump and the voltage-to-current circuit 2, a second end of the resistor R6 is grounded via the capacitor C2, and the capacitor C3 is connected in parallel between the capacitor C2 and ground and between the charge pump and the voltage-to-current circuit 2.
4. The self-adaptive on-time generation circuit capable of being synchronized within a wide frequency range according to claim 1, wherein the ramp generation circuit comprises a second direct current source, a MOS tube and a capacitor C1, the capacitor C1 is grounded, the second direct current source receives AVDD power and is connected with an output end of a multiplier for generating a current I_SLOPE, the current I_SLOPE flows through the capacitor C1 to generate a ramp voltage signal V_SLOPE, a positive input end of the comparator receives the ramp voltage signal V_SLOPE, a drain electrode of the MOS tube is connected between the second direct current source and the capacitor C1, a source electrode of the MOS tube is connected between the capacitor C1 and ground, and a grid electrode of the MOS tube is connected with an output end of the SR latch.
5. The self-adaptive on-time generation circuit capable of being synchronized within a wide frequency range according to claim 1, wherein the input sampling circuit and the output sampling circuit are of a resistor voltage division structure, the input sampling circuit comprises an input voltage VIN, a resistor R1 and a resistor R2 which are sequentially connected, the resistor R2 is grounded, the voltage-to-current circuit 1 is connected between the resistor R1 and the resistor R2, the output sampling circuit comprises an output voltage VOUT, a resistor R3 and a resistor R4 which are sequentially connected, the resistor R4 is grounded, and a negative input end of the comparator is connected between the resistor R3 and the resistor R4.
6. The circuit according to claim 1, wherein the voltage-to-current circuit 1 is of a resistive type or an operational amplifier type.
CN202411335803.2A 2024-09-24 2024-09-24 A Synchronizable Adaptive On-Time Generator Circuit in a Wide Frequency Range Pending CN119203860A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202411335803.2A CN119203860A (en) 2024-09-24 2024-09-24 A Synchronizable Adaptive On-Time Generator Circuit in a Wide Frequency Range

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202411335803.2A CN119203860A (en) 2024-09-24 2024-09-24 A Synchronizable Adaptive On-Time Generator Circuit in a Wide Frequency Range

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CN119203860A true CN119203860A (en) 2024-12-27

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