A current-limiting protection circuit with wide supply voltage range
A current-limiting protection and voltage range technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., to achieve the effect of eliminating current-limiting threshold changes, widening the voltage range, and improving the accuracy of current-limiting thresholds
Active Publication Date: 2022-03-15
湖南崧顺科技有限公司
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Problems solved by technology
In the circuit design, we also want to pay special attention to the cooperative work between different voltage domains and different devices under one power supply voltage, which also brings challenges to the design of power management chips.
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[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.
[0036] In all the circuits of this embodiment, the drain of the MOS transistor is a DMOS transistor with a high drain-source breakdown voltage (that is, a high-voltage device that can withstand high voltage) with two horizontal lines, and a horizontal line that represents an ordinary MOS transistor (that is, an ordinary device with a standard supply voltage). .
[0037] Such as figure 1As shown, a current limiting protection circuit with a wide power supply voltage range includes a bootstrap boost circuit, a load current sampling circuit, a comparator circuit, a level conversion and a latch circuit; the input terminal of the bootstrap boost circuit is connected to T...
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The invention discloses a current limiting protection circuit with a wide power supply voltage range. The circuit includes a bootstrap boost circuit, a load current sampling circuit, a comparator circuit, a level conversion and a latch circuit, and the input terminal of the load current sampling circuit is connected to a power supply. The voltage VCC and the boost signal Vg, the sampling voltage Vsen is used as the output terminal to connect to the comparator circuit; the reference voltage Vref is used as the input terminal of the comparator, and the overcurrent high-voltage domain logic imaxh is obtained by comparing Vref and Vsen. Output low-voltage domain logic imax, which is used to indicate over-current fault, and pull down the gate drive voltage Vg to limit the current of the power switch. There are two voltage domains in the entire current-limiting protection circuit, the first voltage domain: VCC and VSD, the second voltage domain: VDD and GND; the present invention proposes a current-limiting protection circuit with a wide power supply voltage range, which has a sampling circuit without Loss additional power consumption, eliminate absolute resistance error, and can be used in high-voltage, high-current automotive-grade applications and other advantages.
Description
technical field [0001] The invention relates to the field of integrated circuits, in particular to a current limiting protection circuit with a wide power supply voltage range. Background technique [0002] The power management chip needs to provide the appropriate voltage and current to the load. When the load suddenly becomes heavy (for example, the load impedance suddenly decreases), the output current of the power management chip tends to increase suddenly. A sudden increase in current will bring the risk of burning the power management chip itself. For this reason, power management chips usually need to design a current-limiting protection (over-current protection) circuit. When the load current exceeds the limit value set by the chip, the power tube must be turned off in time to reduce or even turn off the output current, thereby achieving protection. Purpose of power management chip and load. [0003] In the power management chip, because of the high voltage involv...
Claims
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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 杨俊魏访
Owner 湖南崧顺科技有限公司