UNIVERSAL DC/DC CONVERTER

2007-1-25

3/10

FSP34063

used, the following output drive condition is recommended:

Forced βof output switch:

7.0

C

C

I output

I driver

mA

−

10

*The 100Ω resistor in the emitter of the driver device requires about 7.0mA before the output switch conducts.

APPLICATION CIRCUITS

(1) Step-Up Converter

Test

Conditions

Results

Line Regulation

20mV=0.035%

Load Regulation

15mV=0.035%

Output Ripple

500mVPP

Efficiency

80%

Vin

-

+

470µF

5

8

56k

4

Ipk

R2

120µH

Comparator

10k

1

R1

Vout

Q1

180

Vout

R

Vcc

Q2

Optional Filter

0.24

CT

100

IN5189

Rsc

2

1.0µH

28V/200mA

12V

Oscillator

7

S

3

1.25V

CT

6

Reference

pF

470µF

Regulator

680

Q

Co