AMC7660

Copyright

© 2006 ADDtek Corp.

8

DD057_C

--

JUNE 2006

Figure 3 – Voltage Inverting Converters

S

Q

R

7

4

6

3

1

Q2

Q1

8

1.25V

5

2

100

OC2

OC1

I sense

Oscillator

C

T

V

IN

0.24

953

8.2K

88uH

1000uF

D1

4.5V to 6.0V

V

OUT

-12V/100mA

1.5nF

100uF

Note: For step-up, step-down or voltage inverting applications requiring peak current greater than 1.5A, external boost current circuitry by NPN or

PNP transistors can be used.

Rsc

R1

R2

Co