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A kind of buck chip circuit and buck chip

A circuit and chip technology, applied in the field of power chips, can solve problems such as breakdown of driving MOS tubes, and achieve the effects of shortening time, improving work reliability, and avoiding too short effective time.

Active Publication Date: 2021-10-26
INSPUR BUSINESS MACHINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a BUCK chip circuit and BUCK chip to solve the problem in the prior art that the gate-source parasitic capacitance of the BUCK chip has not yet completed discharge after the Tri-state signal ends, resulting in the breakdown of the drive MOS tube

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  • A kind of buck chip circuit and buck chip
  • A kind of buck chip circuit and buck chip
  • A kind of buck chip circuit and buck chip

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Embodiment Construction

[0034] In addition to the situation mentioned in the background art, another situation will also lead to similar failures. As mentioned above, if the load suddenly changes from high to low, the controller will send out a Tri-state waveform, and there is a minimum time requirement for the effective part of the Tri-state waveform. If the load current is constantly switching between high and low at a certain higher frequency, then a sudden load current change from high to low will make the controller think that it needs to enter Tri-state, and then a change from low to low A high load current change will make the controller think that it needs to exit Tri-state immediately. When the changing frequency of the load current reaches a specific frequency, the receiving end will exit the Tri-state just after entering the Tri-state. At this time, the minimum time requirement will not be met, causing damage to the IC.

[0035] It should be noted that this failure situation is not an ext...

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Abstract

The invention discloses a BUCK chip circuit, which includes a low-pass driving circuit and a pulse signal circuit; the low-pass driving circuit includes driving a low-pass MOS tube, executing a low-pass MOS tube and gate-source parasitic capacitance; the pulse signal circuit includes A blocking circuit and a forward pulse circuit; the pulse signal circuit is connected to the input end of the driving low-pass MOS tube; the blocking circuit is used for when the PWM input signal is a high-level signal or a low-level signal, Short circuit the forward pulse circuit; the forward pulse circuit is used to output a forward voltage pulse to the cathode of the gate-source parasitic capacitance when the PWM input signal is a Tri-state signal. The present invention avoids the safety hazard caused by the too short effective time of the Tri-state signal due to circuit interference, and the gate-source parasitic capacitance is not fully discharged after the signal ends. At the same time, the present invention also provides a BUCK chip with the above beneficial effects.

Description

technical field [0001] The invention relates to the field of power chips, in particular to a BUCK chip circuit and a BUCK chip. Background technique [0002] In the configuration of the Buck step-down circuit (step-down conversion circuit), a mosfet (metal-oxide-semiconductor field-effect transistor, also referred to as a MOS transistor) is required as a switch. In the existing commonly used voltage regulation circuits, the switching frequency has reached a relatively high level, and the higher switching frequency is to adapt to a higher output current. When the current required by the load changes suddenly, such as from high output current to low output current, the circuit needs to release excess power at this time. The time left for the circuit to discharge excess electric energy is very small, and the minimum duration of this discharge electric energy is usually defined in the chip to ensure the safety of the circuit. [0003] figure 1 A part of the circuit in the exi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M3/155
CPCH02M1/32H02M3/155H02M1/322
Inventor 刘昊
Owner INSPUR BUSINESS MACHINE CO LTD