Clamping control circuit suitable for switching power supply chip
A technology of switching power supply chip and control circuit, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc. It can solve problems affecting safety and reliability, large overshoot, etc., and achieve complete safety functions and good dynamic response , a wide range of effects
Active Publication Date: 2021-06-18
无锡英迪芯微电子科技股份有限公司
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Problems solved by technology
[0006] However, the existing circuit structure has the following disadvantages: when an output short circuit or output overcurrent occurs, the system will reduce the output voltage VOUT by limiting the duty cycle of the power tube switch. At this time, EA will gradually increase VC_EA, The final clamp is at the VCLP_REF voltage. When the output abnormality is released, VC_EA will gradually decrease from VCLP_REF, because VCLP_REF corresponds to the maximum duty cycle, which means that VC_EA will cause a large overshoot of VOUT during the recovery process, which will affect safety. sex and reliability
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[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0028] This application discloses a clamp control circuit suitable for switching power supply chips, please refer to figure 2 , The circuit structure of the switching power supply chip can be referenced figure 1 That is, in the switching power supply chip, the error amplifier EA generates a modulation signal Vc_ea to the pulse modulator PWM_C_EA to the pulse modulator PWM_C_ea and the ramp voltage RAMP based on the modulation signal Vc_ea and the ramp voltage RAMP according to the modulation signal Vc_ea and the ramp voltage RAMP. The square wave signal V_PWM drives the upper tube MP1 and drives the tube MN1 by driving the module, converting the battery input signal VIN to the corresponding output signal Vout, the clamp control circuit connection error amplifier EA and the common end of the pulse modulator PWM_COMP Modulation signal Vc_ea is clamped. Other partial circuits and working principles can be referenced figure 1 ...
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The invention discloses a clamping control circuit suitable for a switching power supply chip, and relates to the field of power supply chips. In the clamping control circuit, one end of a mirror current source formed by a third NMOS tube and a fourth NMOS tube is connected with a second current source, and the other end is connected with a source electrode of a fifth NMOS tube; a drain electrode of the fifth NMOS tube is connected to an inverted input end of a second error amplification circuit to provide a clamping voltage, and the grid electrode is controlled by an overcurrent indication signal and is conducted when a driving tube is in an abnormal state so that the fourth NMOS tube pulls down the current from the inverted end of the second error amplification circuit to reduce the clamping voltage; and therefore, the risk that the clamping position is fixed and too high and cannot play a role when a traditional circuit is abnormal and recovered, and a too high overshoot voltage is generated at the output end is avoided. The clamping control circuit is good in dynamic response, wide in application range, complete in safety function, sound in abnormal protection mechanism and high in reliability, and can be widely applied to a switching power supply chip.
Description
Technical field [0001] The present invention relates to the field of power supply chips, in particular a clamp control circuit suitable for switching power supply chips. Background technique [0002] In consumer electronics and automotive electrons, because the electronic components of various specifications and the demand of the power supply are different, and their energy is derived from the battery terminal, so it is necessary to boost or press down the battery voltage using the power supply chip. Therefore, the application of power chips in consumer electronics, industrial electronics, and automotive electrons is everywhere. [0003] For example, in the automotive electronic chip, its input is usually battery voltage, and its voltage range is about 8V to 20V, and the electricity end is usually an LED lamp bead, a sensor chip, an interface chip, and a master chip, and its operating voltage range is 3V ~ 5V, therefore requires the BUCK (buck converter) chip to supply the batter...
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IPC IPC(8): H02M3/158H02M1/088H02M1/32
CPCH02M3/158H02M1/088H02M1/32
Inventor 董渊李响蔡胜凯张军庄健
Owner 无锡英迪芯微电子科技股份有限公司