TOP242 Power Integrations Inc., TOP242 Datasheet - Page 20

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

Figure 36. Active-on (Fail Safe) Remote ON/OFF.
Figure 38. Active-on Remote ON/OFF with Externally Set
Typical Uses of MULTI-FUNCTION (M) Pin (cont.)
20
ON/OFF
TOP242-249
ON/OFF
Voltage
Input
Voltage
DC
E
7/01
Input
+
DC
47 kΩ
-
Current Limit.
+
47 kΩ
-
Q
R
IL
R
Q
R
August 8, 2000
D
S
D
S
CONTROL
CONTROL
M
M
Figure 40. Active-off Remote ON/OFF with LINE-SENSE.
Voltage
Q
output or can be replaced by
a manual switch.
Input
Q
output or can be replaced
by a manual switch.
C
DC
R
R
C
can be an optocoupler
+
can be an optocoupler
For R
For R
-
ON/OFF
I
I
LIMIT
LIMIT
IL
IL
=
=
12 kΩ
25 kΩ
= 69 %
= 43 %
PI-2519-040501
PI-2520-040501
47 kΩ
D
S
Q
R
R
CONTROL
LS
M
2 MΩ
Figure 37. Active-off Remote ON/OFF. Maximum Duty Cycle will
Figure 39. Active-off Remote ON/OFF with Externally Set
C
Voltage
Q
output or can be replaced
by a manual switch.
Voltage
Input
DC
Input
R
+
DC
-
can be an optocoupler
+
-
be Reduced.
Current Limit.
R
For R
V
V
ON/OFF
IL
UV
OV
ON/OFF
= 100 VDC
= 450 VDC
12 kΩ
LS
PI-2523-040501
= 2 MΩ
47 kΩ
D
S
47 kΩ
D
S
CONTROL
Q
Q
CONTROL
R
R
M
M
45 kΩ
R
R
MC
MC
C
C
Q
output or can be replaced
by a manual switch.
24 kΩ
Q
output or can be replaced
by a manual switch.
R
R
can be an optocoupler
can be an optocoupler
R
MC
=
PI-2522-040501
PI-2521-040501
2R
IL