*0.8

R1

120

W £

£

W

OUT

1.250V

I

=

R1

LM137, LM337-N

SNVS778E – MAY 1999 – REVISED JANUARY 2016

www.ti.com

Typical Applications (continued)

8.2.3 Current Regulator

LM137. By regulating a constant 1.25 V between these two terminals, a constant current can be delivered.

(3)

(4)

8.2.4

−5.2-V Regulator with Electronic Shutdown

The LM337-N can be used with a PNP transistor to provide shutdown control from a TTL control signal. The PNP

can short or open the ADJ pin to GND. When ADJ is shorted to GND by the PNP, the output is

−1.3V. When

ADJ is disconnected from GND by the PNP, then the LM337-N outputs the programmed output of

−5.2 V.

Minimum output

≃ −1.3 V when control input is low

14

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