SG1543/SG2543/SG3543
APPLICATION INFORMATION
(continued)
The values for the external components are
determined as follows:
1000
Current limit input threshold, V
TH
≈
R
1
C
S
is determined by the current loop dynamics
V
V
R
2
Peak current to load, I
P
≈
R
TH
+ R
O
R
2
+R
3
SC
SC
V
TH
Short circuit current, I
SC
= R
SC
2.5 (R
4
+R
5
+R
6
)
Low output voltage limit, V
O
(Low) =
R
5
+R
6
2.5 (R
4
+R
5
+R
6
)
High output voltage limit, V
O
(High) =
R
6
(
)
Voltage sensing delay, t
D
= 10,000 C
D
FIGURE 9 - TYPICAL APPLICATION CIRCUIT
V
IN
- 5
SCR trigger power limiting resistor, R
G
> 0.2
FIGURE 10 - SENSING MULTIPLE SUPPLY VOLTAGES
FIGURE 11 - OVERCURRENT SHUTDOWN
11/91 Rev 1.1 2/94
Copyright
©
1994
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INFINITY
Microelectronics Inc.
MICROSEMI [ MICROSEMI CORPORATION ]
