Voltage stabilizing circuit for preventing abnormity of starting voltage of power management chip
A technology of power management chip and voltage regulator circuit, which is applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of small resistance value of starting resistance, voltage of power management chip failing to meet test requirements, and poor start-up.
Active Publication Date: 2016-12-07
SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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[0002] The power management chip is a very important chip in electronic equipment. The power management chip is responsible for the transformation, distribution, detection and other power management of electric energy in the electronic equipment system. However, some power chips are in the process of testing before leaving the factory. There will be poor starting at low temperature. The reason is that the starting pressure will decrease at low temperature, and the starting voltage is generated by connecting the current source to a starting resistor. The resistance of the starting resistor will become smaller at low temperature, resulting in The start-up voltage becomes smaller, which causes the output voltage of the power management chip to fail to meet the test requirements
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[0016] Below, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0017] see figure 1 , the preferred embodiment of the voltage stabilizing circuit for preventing abnormal starting voltage of the power management chip of the present invention includes an OR gate circuit 10, a multiplexer MUX, an operational amplifier OP, a first comparator COMP1 and a second comparator Device COMP2, a first input terminal (0) of the multiplexer MUX is used to receive a start-up voltage V starup , the output end of the multiplexer MUX is connected to the non-inverting input end of the operational amplifier OP, and the output end of the operational amplifier OP is connected to the positive input end of the first comparator COMP1 through a first voltage divider circuit 70 Phase input terminal, the inverting input terminal of the first comparator COMP1 receives a first reference voltage, the non-inverting input terminal of the se...
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The invention provides a voltage stabilizing circuit for preventing abnormity of starting voltage of a power management chip. The voltage stabilizing circuit comprises an or gate circuit, a multiplexer, an operational amplifier, a first comparator and a second comparator, wherein a first input end of the multiplexer is used for receiving starting voltage; an output end of the operational amplifier is connected with a normal phase input end of the first comparator through a first voltage division circuit; an inverse phase input end of the first comparator is used for receiving first reference voltage; a normal phase input end of the second comparator is used for receiving second reference voltage; the inverse phase input end of the first comparator is connected with a second input end of the multiplexer, and the first input end is connected with an inverse phase input end of the second comparator; an output end of the first comparator and an output end of the second comparator are connected with a selective control end of the multiplexer through the or gate circuit; an output end of the multiplexer is used for outputting the first reference voltage when the starting voltage is abnormal and is smaller than the second reference voltage.
Description
technical field [0001] The invention relates to the field of power supplies, in particular to a voltage stabilizing circuit for preventing abnormal starting voltage of a power supply management chip. Background technique [0002] The power management chip is a very important chip in electronic equipment. The power management chip is responsible for the transformation, distribution, detection and other power management of electric energy in the electronic equipment system. However, some power chips are in the process of testing before leaving the factory. There will be poor starting at low temperature. The reason is that the starting pressure will decrease at low temperature, and the starting voltage is generated by connecting the current source to a starting resistor. The resistance of the starting resistor will become smaller at low temperature, resulting in The start-up voltage becomes smaller, causing the output voltage of the power management chip to fail to meet the tes...
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Login to View More IPC IPC(8): G05F1/56
CPCG05F1/562
Inventor 李文芳张先明
Owner SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD