SP34063A Datasheet, PDF (7/10 Pages) Sipex Corporation – 1.5A Buck/Boost/Inverting DC-DC Switching Regulator

TYPICAL INVERTING CONVERTER CIRCUIT
8
7
RSC
0.24
VIN = 4.5V - 6V
6
+ _C1
100µF
5
SP34063A
B
S
A
Q
R
Ipk
OSC ^CT
+
-
1.25V
Reference
Regulator
R2 8.2k
R1 953k
1
2
L1
88 µH
3
CT
1500 pF
D1
4
1N5819
VOUT
L2 1.0 µH
-12V/100mA
VOUT
C2
+ 1000 µF
Optional
Filter
C3
+ 100 µF
This is a typical boost converter configuration. The working process in the steady state is similar to a boost converter,
the difference in this situation is that the voltage at the non-inverting pin of the comparator is equal to 1.25V +V_OUT,
then Vpin5 = V_OUT*R2/(R1+R2) = 1.25V, + V_OUT. The output voltage can be decided by V_OUT = -1.25V*(R1+R2)/R1
(V).
Date: 1/11/05
SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator
7
© Copyright 2005 Sipex Corporation