TOP242 Power Integrations Inc., TOP242 Datasheet - Page 17

• 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 24. Active-on Remote ON/OFF with Externally Set Current
Figure 22. Active-on (Fail Safe) Remote ON/OFF.
Figure 26. Active-off Remote ON/OFF with LINE-SENSE.
Voltage
Voltage
Voltage
Input
Input
Input
DC
DC
DC
+
+
+
Limit.
-
-
-
ON/OFF
47 kΩ
D
S
D
S
D
S
Q
R
Q
CONTROL
R
CONTROL
CONTROL
LS
R
X
X
L
2 MΩ
R
47 kΩ
IL
Q
output or can be replaced by
a manual switch.
R
Q
output or can be replaced
by a manual switch.
Q
C
C
C
can be an optocoupler
R
R
Q
output or can be replaced
by a manual switch.
can be an optocoupler
R
ON/OFF
can be an optocoupler
47 kΩ
For R
For R
For R
V
V
UV
OV
I
I
LIMIT
LIMIT
IL
IL
PI-2626-040501
= 100 VDC
= 450 VDC
PI-2625-040501
PI-2622-040501
=
=
ON/OFF
LS
12 kΩ
25 kΩ
= 69 %
= 43 %
= 2 MΩ
Figure 27. Active-on Remote ON/OFF with LINE-SENSE and
Figure 25. Active-off Remote ON/OFF with Externally Set Current
Figure 23. Active-off Remote ON/OFF. Maximum Duty Cycle will
Voltage
Voltage
Voltage
Input
Input
Input
DC
DC
DC
+
+
+
EXTERNAL CURRENT LIMIT.
Limit.
-
-
-
be reduced.
ON/OFF
ON/OFF
47 kΩ
47 kΩ
D
D
S
D
S
S
August 8, 2000
R
Q
Q
CONTROL
CONTROL
CONTROL
LS
R
R
X
X
R
L
L
L
2 MΩ
IL
45 kΩ
R
45 kΩ
R
R
IL
MC
MC
C
C
C
TOP242-249
DC
DC
Q
output or can be replaced
by a manual switch.
R
Q
MAX
MAX
can be an optocoupler
R
Q
optocoupler output or
can be replaced
by a manual switch.
V
V
Q
optocoupler output
or can be replaced
by a manual switch.
UV
OV
R
47 kΩ
R
@100 VDC = 78%
@375 VDC = 38%
can be an
= I
= I
For R
can be an
OV
UV
PI-2627-040501
I
PI-2628-040501
PI-2621-040501
x R
LIMIT
x R
IL
ON/OFF
7/01
=
E
LS
LS
12 kΩ
= 69 %
17