AMC7660 Datasheet, PDF (7/11 Pages) ADDtek Corp – DC - DC CONVERTER CONTROL CIRCUIT

AMC7660
Figure 1 – Step-Up Converter Application Circuits
180
V_OUT
28V/175mA
170uH
D1
Co 330uF
8
OC2
1 ^{OC1 Q2}
Q1
100
2
0.22
Rsc
7
6
S
QR
I sense
C_T
Oscillator
47K
R1
1.25V
V _IN
12V
100uF
5 R2
2.2K
4
3
1.5nF
Figure 2 – Step-Down Converter Application Circuit
8
OC2
0.33
Rsc
7
S
3.6K
R1
V _IN
25V
6
100uF
5 _R2
1.2K
V_OUT
5V/500mA
220uH
Co 470uF D1
1 ^{OC1 Q2}
Q1
100
2
QR
I sense
C_T
Oscillator
3
470pF
1.25V
4
Copyright © 2006 ADDtek Corp.
7
DD057_C -- JUNE 2006