UC17131/2/3
UC27131/2/3
UC37131/2/3
APPLICATION INFORMATION (cont.)
VREF
11
6V
PRE-REGULATOR
7
I
CC
C
REF
6
CSH
LS
5
INPUT
COMPARATOR
OUT
C
CC
LOAD
VCC
+L
IN
13
72V
POWER
SUPPLY
Q
OUT
HS
4
TURN-ON/OFF
AND SHORT
CIRCUIT
PROTECTION
CSL
3
R
CSL
2
GND
–L
I
GND
VREF
GND
1/2
VREF
12
HYST
9
LED
R
HYST
CDEL
10
C
CDEL
UDG-98028
Figure 2b. Low side application.
t
INT
VCC
t
V
CDEL_MAX
= 5.8V
V
CDEL
V
FAULT_H
= 4.9V
V
FAULT_H
t
OUTPUT
DRIVER
t
D(ON)
DISABLED
ENABLED
INDETERMINATE
STATE
UDG-98029
ENABLED
t
Figure 3a. Power interrupt ignore operation, high side configuration, V
IN
= 5VDC.
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8
ETC [ ETC ]
