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Soft start business unit circuit diagram

2015-01-01 00:00  
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This article introduces the soft start circuit diagram of public institutions. The circuit is very simple, very cheap, but it is very effective. If you want to more thoroughly grasp the principle, you can have an idea of the circuit is the important component, such as: L200, LM317 . Two soft start power supply. Slowly increase the output voltage to the desired output. The output voltage is slowly rising, 15 V in 5 seconds. In order to perform the function of the soft start, LM317 voltage regulator IC need an external general PNP transistors and L200 to use its internal comparator (pin 2). After connect, rising voltage electrolytic capacitor charging on the positive side of the slow rotation (the first conductive) transistor closed, thus improve the voltage (relatively) adjust pin LM317. In the L200 circuit, the corresponding electrolytic capacitor voltage current loop in L200 gradually rise to relax. 



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