4

LR12

A081605

Typical Application Circuits

LR12

to 100V

ADJ

R

1.20V

R

+

-

100nF

Figure 3: High Voltage Adjustable Constant Current Source

PWM IC

LR12

Vout1

Vout2

+

+

-

-

Vcc

VAuxiliary

V

OUT

ADJ

V

IN

FB

Figure 2: SMPS Start-Up Circuit

LR12

V

OUT

ADJ

V

IN

*

R1

6.04KΩ

±1%

R2

18.2KΩ

±1%

C2

100nF

C1

V

V

R2

R1

Figure 1: High Input Voltage, 5.0V Output Linear Regulator