7815稳压电源电路图

　　连续可调的双电源（正负对称电源）。此电路由一块７８１５和一块７９１５三端稳压器对称连接，即可获得一组正负对称的稳压电源，而且输出电压值可各自单独调节，也可同步调节。



　　电路如图所示，由变压器输出的交流双１８Ｖ电压经Ｄ１～Ｄ４整流，Ｃ１、Ｃ２滤波得到一直流电压，其中变压器双电源的中心抽头作为公共接地端，然后分别把该直流电压正负极接入７８１５的①脚和７９１５的③脚。７８１５的③脚接到电位器Ｗ２的滑动触片“ｄ”上，７９１５的①脚接到电位器Ｗ１的滑动触片“Ｃ”上。当将触片“Ｃ”滑到“０”端接地时，调节Ｗ２，即可从“ａ”端得到“＋６～＋１５Ｖ”的正向可变电压；若将触片“ｄ”滑到“０”端接地，调节Ｗ１，在“ｂ”端就可得到“－６～－１５Ｖ”的负向可变电压，将Ｗ１、Ｗ２换成同轴电位器，将获得正负对称的可调电源，输出电压值在±６Ｖ～±１５Ｖ之间连续可调，可达到同步调节的目的。



　　本电路的７８１５、７９１５三端稳压块上应加装散热片，做散热用。

　　如图所示7815稳压电源电路图

7915/LM7915应用电路

作者：本站  来源：www.elecfans.com  发布时间：2008-10-14 16:18:24  [收 藏] [评 论]

7915/LM7915应用电路

*Required if regulator is separated from filter capacitor by

more than 3". For value given, capacitor must be solid

tantalum. 25μF aluminum electrolytic may be substituted.

†Required for stability. For value given, capacitor must be

solid tantalum. 25μF aluminum electrolytic may be substituted.

Values given may be increased without limit.

For output capacitance in excess of 100μF, a high current

diode from input to output (1N4001, etc.) will protect the

regulator from momentary input shorts.

7915 Typical Applications (Continued)

Load Regulation at DIL = 1A 40mV 2mV

Output Ripple, CIN = 3000μF, IL = 1A 100 μVms 100 μVms

Temperature Stability 50mV 50mV

Output Noise 10Hz £ f £ 10kHz 150 μVms 150 μVms

*Resistor tolerance of R4 and R5 determine matching of (+) and (−) outputs.

**Necessary only if raw supply filter capacitors are more than 3" from regulators.

7815稳压电源电路图