Thursday, January 28, 2010

Adjustable power supply using LM317

Adjustable power supply using LM317

For the LM317:

R2 = (192 x Vout) - 240, where R2 in ohms, Vout is in volts and must be at between 1.2 V and 35 V.

Vin should be at least 2.5V greater than Vout. Select a wall adapter with a voltage at least 2.5 V greater than your regulated output at full load

Maximum output current is 1 A. Use proper heatsink for LM317 if it has to dissipate more than 1W.

The tab of the LM317 is connected to the center pin.

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