Integrated regulated power supply circuit

Published:2011/4/1 1:03:00 Author:Nicole | Keyword: regulated power supply | From:SeekIC

This is a integrated regulated power supply with continuously adjustable output, the output voltage is continuously adjustable between 1.25-37V, the maximum output current is up to 1.5A. The circuit is simple, and can be made by E-lovers, it is used for power supplying to all kinds of small electrical. The circuit diagram is shown in figure1. LM317 output current is 1.5A, the output voltage can be continuously adjustabled between 1.25-37V, it is determined by two external resistors R1, RP1, the Voltage difference between output terminal and adjustment terminal is 1.25V, this voltage will produce a few milliamps current, to groud through R1, RP1, added the voltage from RP1 to adjustment terminal, the oputput voltage can be changed by changing RP1. A note which is, in order to obtain steady output voltage, the current flowing through R1 is less than 3.5mA. Without the radiator, the maximum power consumption of LM317 is 2W, with the 200×200×4mm3 radiator, then the maximum power consumption is 15W. VD1 is used to protect diode, prevent regulator output terminal from shorting and damaging IC, VD2 is used to prevent input shorting and damaging IC. After weld and inspect to be flawless, the machine can be normal used, don't need to debug. When it is welding, capacitor C2 should close to the input terminal of IC, C3 should close to the output terminal, it is better to suppress ripple. 编　号 名　称 型　号 数　量 R1 电阻 100Ω 1 RP1 可调电阻 5.1K 1 C1 电解电容 2200u/50V 1 C2 涤纶电容 0.33u 1 C3 电解电容 10u/50V 1 C4 电解电容 100u/50V 1 VD1、VD2 整流二极管 IN4002 2 U 整流全桥 3A/50V 1 IC 可调三端稳压 LM317 1 T 电源变压器 28V 1



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