Overcurrent protection chip and setting method for power supply
A technology of power supply and protection chip, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as lack of efficiency and inaccuracy
Active Publication Date: 2014-05-14
WELTREND SEMICON INC
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Problems solved by technology
[0005] However, the existing over-current protection setting method for power supplies needs to gradually adjust the resistance value of the variable resistor VR manually, which is not only inaccurate but also inefficient.
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[0038] Please also refer to figure 2 and image 3 , figure 2 It is a schematic diagram of the overcurrent protection circuit 200 of the power supply of the present invention, image 3 It is a schematic diagram of the overcurrent protection chip 210 of the power supply of the present invention in a setting state. As shown in the figure, the overcurrent protection circuit 200 of the present invention includes a first resistor R1 , a second resistor R2 , and an overcurrent protection chip 210 . A first end of the first resistor R1 (current detection resistor) is coupled to the voltage input terminal Vcs, and a second end of the first resistor R1 is coupled to a load 120 . The first terminal of the second resistor R2 is coupled to the voltage input terminal Vcs. The overcurrent protection chip 210 includes a first pin P1, a second pin P2, a third pin P3, a fourth pin P4, a comparator 212, a reference signal adjustment unit 214, and a storage unit 216 , and a decoder 218. T...
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Provided is an overcurrent protection chip and a setting method for a power supply. The overcurrent protection chip for a power supply comprises a comparator, a reference signal adjusting unit, and a storage unit. The first input end of the comparator is used for receiving a load current detecting signal. The second input end of the comparator is used for receiving a reference signal. The comparator is used for comparing the voltage level of the load current detecting signal with the voltage level of the reference signal in order to output a compared signal via an output end of the comparator. The reference signal adjusting unit is coupled to the second input end and is used for adjusting the voltage level of the reference signal according to multiple setting values of a set of setting data in a setting state. The storage unit is coupled to the reference signal adjusting unit and is used for storing a corresponding setting value in the set of setting data when the compared signal outputted from the comparator in the setting state is changed, and controlling the reference signal adjusting unit in an operating state according to the corresponding setting value.
Description
technical field [0001] The invention relates to an overcurrent protection chip of a power supply and a setting method thereof, in particular to an overcurrent protection chip of a power supply which can be automatically set according to setting data and a setting method thereof. Background technique [0002] The power supply is used to supply power to the electronic device. In order to prevent the load of the electronic device from being too large and exceeding the safe load range of the power supply, the power supply is usually equipped with an over-current protection circuit for detecting the load current, and based on the load current When the load is higher than the upper limit, an over-current protection signal is output to notify the power supply to take corresponding protection measures, such as shutting down. [0003] Please refer to figure 1 , figure 1 It is a schematic diagram of an overcurrent protection circuit 100 of a conventional power supply. Such as figu...
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IPC IPC(8): G05F1/573
Inventor 林恺江谢伯州郑健铭
Owner WELTREND SEMICON INC