LM385/LM385B

5

-

+

-

+

7µA

1.2

FB

-

+

FB

PIN +

-

sinks current with a range from 20

µA to 20mA for normal applications. And a stable positive voltage,

relative to Pin-, occurs on Pin+.

PIN -

-

Pin- sources current for normal application. The current value is the same as Pin+.

PIN NC -

Not connected.

120K

R2

120K

R1

-

+

LM385

2N2219

R3

1K

50

µA<I<200mA

FB

2.5V

R4

100µA<I<5mA

FB

-

+

R3

LM385

2N5115

2.4M

R2

120K

R1

25V

Fig. 9

200mA Shunt Regulator

Fig. 10

25V Low Current Shunt Regulator

R2

R1

2N2905

2N3964

FB

-

+

120K

R3

200

D1

<-12V

LED ON

R2

1M

FB

120K

R1

-5V

-

+

Fig. 11 Current Source

Fig. 12

Voltage Level Detector