TOP242-250
Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins (cont.)
QR can be an
+
+
QR can be an optocoupler
output or can be replaced by
a manual switch.
optocoupler output or
can be replaced
by a manual switch.
QR
ON/OFF
RMC
47 kΩ
DC
Input
Voltage
DC
Input
Voltage
D
S
45 kΩ
CONTROL
C
D
L
CONTROL
C
X
ON/OFF
QR
47 KΩ
S
-
-
PI-2625-040501
PI-2621-040501
Figure 22. Active-on (Fail Safe) Remove ON/OFF.
Figure 23. Active-off Remote ON/OFF. Maximum Duty Cycle
Reduced.
+
QR can be an
+
QR can be an optocoupler
output or can be replaced
by a manual switch.
QR
optocoupler output
or can be replaced
by a manual switch.
ON/OFF
RMC
47 kΩ
For RIL =12 kΩ
45 kΩ
ILIMIT = 69%
DC
Input
Voltage
DC
Input
D
S
D
L
For RIL = 25 kΩ
CONTROL
CONTROL
ILIMIT = 43%
Voltage
C
C
X
S
X
RIL
RIL
ON/OFF
QR
47 kΩ
-
-
PI-2627-040501
PI-2626-040501
Figure 24. Active-on Remote ON/OFF with Externally Set Current
Limit.
Figure 25. Active-off Remote ON/OFF with Externally Set Current
Limit.
VUV = IUV x RLS
VOV = IOV x RLS
QR can be an optocoupler
output or can be replaced
by a manual switch.
+
+
RLS 2 MΩ
DCMAX@100 VDC = 78%
DCMAX@375 VDC = 38%
2 MΩ
RLS
QR
For RLS = 2 MΩ
ON/OFF
QR can be an optocoupler
output or can be replaced
by a manual switch.
47 kΩ
DC
Input
Voltage
VUV = 100 VDC
VOV = 450 VDC
D
S
L
CONTROL
DC
Input
Voltage
C
For RIL =12 kΩ
D
L
ILIMIT = 69%
CONTROL
C
X
QR
RIL
ON/OFF
S
47 kΩ
-
-
PI-2622-040501
PI-2628-040501
Figure 26. Active-off Remote ON/OFF with LINE-SENSE.
Figure 27. Active-on Remote ON/OFF with LINE-SENSE and
EXTERNAL CURRENT LIMIT.
M
16 12/04
POWERINT [ Power Integrations ]
