LM317LM datasheet(13/17 Pages) NSC

Part #	LM317LM

Description	3-Terminal Adjustable Regulator

PDF	17 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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13 / 17 page

Typical Applications (Continued)

Precision High Voltage Regulator

DS009064-30

Q1, Q2: NSD134 or similar

C1, C2: 1µF, 200V mylar**

*Heat sink

**Mylar is a registered trademark of DuPont Co.

Tracking Regulator

DS009064-31

A1 = LM301A, LM307, or LF13741 only

R1, R2 = matched resistors with good TC tracking

Regulator With Trimmable Output Voltage

DS009064-32

Trim Procedure:

—If VOUT is 23.08V or higher, cut out R3 (if lower, don’t cut it out).

— Then if VOUT is 22.47V or higher, cut out R4 (if lower, don’t).

— Then if VOUT is 22.16V or higher, cut out R5 (if lower, don’t).

This will trim the output to well within ±1% of 22.00 VDC, without any of

the expense or uncertainty of a trim pot (see LB-46). Of course, this

technique can be used at any output voltage level.

LM317LM Datasheet(PDF) 13 Page - National Semiconductor (TI)