OUT

ADJ

2

R2

‚‚ 9

9

,

5

R1

§

·

¨

¸

©

¹

Copyright © 2017, Texas Instruments Incorporated

LM138QML

ADJ

VIN > 28 V

C1*

0.1 µF

R1**

240

R2**

5 k

C2‚

1 µF

+

LM138QML

ADJ

R1

120

R2

1.4 k

D1

LM329

Copyright © 2017, Texas Instruments Incorporated

17

LM138QML

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SNVSAA9 – OCTOBER 2017

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8.3 System Examples

Figure 21. Regulator and Voltage Reference

Full output current not available at high input-output voltages

† Optional—improves transient response. Output capacitors in the range of 1 μF to 1000 μF of aluminum or tantalum

electrolytic are commonly used to provide improved output impedance and rejection of transients.

* Needed if device is more than 6 inches from filter capacitors.

** R1, R2 as an assembly can be ordered from Bourns:

MIL part no. 7105A-AT2-502

COMM part no. 7105A-AT7-502

Figure 22. 1.2-V to 25-V Adjustable Regulator