SMSA SERIES
5 WATT
DC/DC CONVERTERS
6
1
Positive
Output
Positive
Input
Output Filter
Error
Amp
5
VR
2
Inhibit
Output
Common
PWM
Control
Input
7
8
Common
3
Negative
Output
Output Filter
Feedback
Case
Ground
= DUAL OUTPUT
FIGURE 1: SMSA BLOCK DIAGRAM
SMSA
Positive
Input
6
12 k ꢀ
5 k ꢀ
400 ꢀ
5
Inhibit
50 k ꢀ
200 pF
10 K
2N3904
7
Vcc
Typically 1.5 V
when inhibited
10 k ꢀ
3.9 K
Input
Common
FIGURE 2: INHIBIT INTERFACE
4