UNIVERSAL DC/DC CONVERTER
FSP34063
used, the following output drive condition is recommended:
Forced
βof
output switch:
I
C
output
≥
10
I
C
driver
−
7.0
mA
∗
*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
120µH
8
180
S
R
7
Rsc
0.24
Vin
12V
6
470µF
Vcc
Ipk
Oscillator
CT
Q
Q2
Q1
1
2
3
1.25V
Reference
Regulator
4
IN5189
CT
680
pF
Comparator
+
-
5
R2 56k
R1 10k
470µF
Vout
28V/200mA
Co
1.0µH
Vout
100
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Efficiency
Conditions
Vin=9V to 12V, I
O
=200mA
Vin=12V, I
O
=50mA to 200mA
Vin=12V, I
O
=200mA
Vin=12V, I
O
=200mA
Results
20mV=0.035%
15mV=0.035%
500mVPP
80%
3/10
2007-1-25
FOSLINK [ FOSLINK SEMICONDUCTOR CO.,LTD ]
