TOP242 Power Integrations Inc., TOP242 Datasheet - Page 18

• Manufacturer Part Number: TOP242
• Description: Family Extended Power/ Design Flexible/Integrated Off-line Switcher
• Manufacturer: Power Integrations Inc.

Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins (cont.)
Figure 28. Line-Sensing and Externally Set Current Limit.
18
TOP242-249
Voltage
Input
E
7/01
DC
+
-
August 8, 2000
D
S
R
CONTROL
LS
X
12 kΩ
R
L
IL
2 MΩ
C
For R
DC
DC
For R
I
See fig. 55 for other
resistor values (R
to select different I
values
V
V
LIMIT
V
V
MAX
MAX
UV
OV
UV
OV
LS
@100 VDC = 78%
@375 VDC = 38%
= I
= I
= 100 VDC
= 450 VDC
= 69%
IL
= 2 MΩ
OV
UV
= 12 kΩ
PI-2629-040501
x R
x R
LS
LS
IL
LIMIT
)
Figure 29. Active-on Remote ON/OFF.
Voltage
Input
DC
+
-
D
S
CONTROL
L
300 kΩ
Q
output or can be replaced by
a manual switch.
R
C
can be an optocoupler
Q
R
47 kΩ
PI-2640-040501
ON/OFF