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Circuit for preventing power supply voltage from influencing turn-off time delay

A power supply voltage and circuit technology, which is applied in the field of circuits that prevent the power supply voltage from affecting the turn-off time delay, can solve the problems of power consumption and other problems, and achieve the effect of saving power, simple method and low power consumption

Pending Publication Date: 2022-05-03
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this way, the system enable control process consumes a lot of power

Method used

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  • Circuit for preventing power supply voltage from influencing turn-off time delay
  • Circuit for preventing power supply voltage from influencing turn-off time delay
  • Circuit for preventing power supply voltage from influencing turn-off time delay

Examples

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Embodiment Construction

[0027] The application will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present application.

[0028] figure 1 It is a structural schematic diagram of an enabling control circuit in the prior art of the present invention. Such as figure 1 As shown, the enable control circuit in the prior art includes a mirror unit and first and second inverters. Wherein, the mirror unit includes the enable input power transistor Mn0, and other parts can be used to generate the mirror current of the power transistor Mn0, and calculate the actual current through the source and drain of the power transistor Mn0 during the conduction process. In addition, a plurality of inverters are cascaded after the drain of the power transistor Mn0 in the circuit, and after passing through the inverters, the output signal...

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Abstract

The invention discloses a circuit for preventing power supply voltage from influencing turn-off time delay. The circuit is characterized by comprising an enabling output unit, a mirror current generation unit and a negative feedback unit, wherein the enabling output unit is respectively connected with the feedback unit and the mirror current generating unit, and is used for generating a chip enabling signal based on the input of a system enabling signal and outputting the chip enabling signal; the mirror current generation unit is used for generating stable mirror current based on the state of the chip enable signal and replacing a high-end mirror tube in the enable output unit; and the feedback unit is used for receiving the chip enable signal from the enable output unit, controlling a mirror image tube in the enable output unit to be conducted, and stabilizing the time delay of the chip enable signal relative to the system enable signal based on the mirror image current generated by the mirror image current generation unit. The method is low in cost, low in power consumption in the system enabling process, and stable and predictable in turn-off time delay.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a circuit for preventing the power supply voltage from affecting the turn-off time delay. Background technique [0002] At present, in the control circuit such as DC-DC (Direct Current-Direct Current, also known as DC-DC) converter, the upper and lower transistors are turned on or off, the system enable signal is usually used as the input of the circuit, and the multi-stage inversion After the device, output the control signal of on or off. There is usually a certain turn-off delay between the turn-on or turn-off control signal generated in this way and the enable signal at the input end. [0003] Generally speaking, this delay includes the charging delay t caused by the parasitic capacitance of the power transistor where the enable signal is located. 0 , The transmission delay t caused by the multi-stage inverter 1 and t 2 Wait. Generally speaking, the charging time delay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/284H03K17/687
CPCH03K17/284H03K17/6871
Inventor 林克龙
Owner SG MICRO
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