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34063AM

1.5A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER

BCD Semiconductor 

1.5A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER

Typical Applications

L1 150µH

Data Sheet

AZ34063A

R3 180 8

VIN 12V

7

Rsc

0.22

6

+

C1

100µF

5

R2

2.2k

B

SQ

A

R

IIpPkK

OSC CT

1.25V

+

Reference

Regulator

-

U1 AZ34063A

R1 47k

1

2

D1

1N5819

3

CT

470pF

4

VOUT

28V/175mA

+

C2

330 µF

L2 1.0 µΗ

Optional

Filter

VOUT

+

C3

100 µF

Figure 10. Step-Up Converter (Note 5)

Note 5: This is a typical step-up converter configuration. In the steady state, if the resistor divider voltage at pin

5 is greater than the voltage in the non-inverting input, which is 1.25V determined by the internal reference, the

output of the comparator will go low. At the next swithching period, the output switch will not conduct and the

output voltage will eventually drop below its nominal voltage until the divider voltage at pin 5 is lower than 1.25V.

Then the output of the comparator will go high, the output switch will be allowed to conduct. Since VPIN5=VOUT*

R2/(R1+R2)=1.25(V), the output voltage can be decided by VOUT=1.25 * (R1+R2)/R2 (V).

Sep. 2006 Rev. 1. 3

BCD Semiconductor Manufacturing Limited

8

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