TOP242-250
Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins (cont.)
VUV = IUV x RLS
VOV = IOV x RLS
+
+
QR can be an optocoupler
output or can be replaced by
a manual switch.
For RLS = 2 MΩ
2 MΩ
RLS
VUV = 100 VDC
VOV = 450 VDC
DC
Input
Voltage
DC
Input
Voltage
300 kΩ
DCMAX@100 VDC = 78%
DCMAX@375 VDC = 38%
D
S
L
D
S
L
CONTROL
CONTROL
C
C
For RIL = 12 kΩ
ILIMIT = 69%
X
See Figure 54b for
other resistor values
(RIL) to select different
ILIMIT values
ON/OFF
QR
RIL
12 kΩ
47 kΩ
-
-
PI-2640-040501
Figure 28. Line-Sensing and Externally Set Current Limit.
Figure 29. Active-on Remote ON/OFF.
Typical Uses of MULTI-FUNCTION (M) Pin
+
+
VUV = IUV x RLS
VOV = IOV x RLS
C
D
S
S
S
M
S
For RLS = 2 MΩ
VUV = 100 VDC
VOV = 450 VDC
RLS
2 MΩ
DC
Input
DC
Input
Voltage
Voltage
DCMAX@100 VDC = 78%
DCMAX@375 VDC = 38%
D
S
M
D
S
M
C
D
S
CONTROL
CONTROL
C
C
-
-
PI-2508-081199
PI-2509-040501
Figure 30. Three Terminal Operation (MULIT-FUNCTION Features
Disabled).
Figure 31. Line-Sensing for Undervoltage, Over-Voltage and Line
Feed-Forward.
+
+
VOV = IOV x RLS
VUV = RLS x IUV
2 MΩ
2 MΩ
For Values Shown
VOV = 450 VDC
For Value Shown
VUV = 100 VDC
RLS
RLS
DC
Input
Voltage
DC
Input
Voltage
22 kΩ
30 kΩ
1N4148
D
S
M
D
S
M
CONTROL
CONTROL
C
C
6.2 V
-
-
PI-2516-040501
PI-2510-040501
Figure 33. Line-Sensing for Overvoltage Only (Under-Voltage
Disabled). Maximum Duty Cycle Reduced at Low Line
and Further Rediction with Increasing Line Voltage.
Figure 32. Line-Sensing for Under-Voltage Only (Overvoltage
Disabled).
M
12/04
17
POWERINT [ Power Integrations ]
