AZ34063D Datasheet, PDF (10/14 Pages) BCD Semiconductor Manufacturing Limited – 1A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER

1A STEP-DOWN/STEP-UP/INVERTING DC-DC CONVERTER
Typical Applications (Continued)
Data Sheet
AZ34063D
8
V_IN 25V
7
Rsc
0.33
6
+ _C1
100µF
5
R2
1.2k
B
SQ
A
R
IIp_Pk_K
OSC ^CT
1.25V
+
Reference
Regulator
-
U1 AZ34063D
R1 3.6k
1
2
D1
1N5819
3
CT
470 pF
L1
220 µH
4
V_OUT
5V/500mA
+
C2
470 µF
L2 1.0 µH
Optional
Filter
V_OUT
+
C3
100 µF
Figure 15. Step-Down converter (Note 6)
Note 6: This is a typical step-down converter configuration. The working process in the steady state is similar to
step-up converter, V_PIN5=V_OUT*R2/(R1+R2)=1.25 (V), the output voltage can be decided by V_OUT=1.25*
(R1+R2)/R2 (V).
Mar. 2010 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
10