TOP242-249 POWERINT [Power Integrations, Inc.], TOP242-249 Datasheet - Page 16

• Manufacturer Part Number: TOP242-249
• Description: Family Extended Power, Design Flexible,Integrated Off-line Switcher
• Manufacturer: POWERINT [Power Integrations, Inc.]

Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins
Figure 18. Line-Sensing for Under-Voltage Only (Overvoltage
Figure 20. Externally Set Current Limit.
Figure 16. Three Terminal Operation (LINE-SENSE and
16
TOP242-249
Voltage
Voltage
Input
Voltage
DC
Input
E
7/01
Input
DC
+
DC
-
+
Disabled).
+
EXTERNAL CURRENT LIMIT Features Disabled.
FREQUENCY Pin can be tied to SOURCE or
CONTROL Pin).
-
-
6.2 V
August 8, 2000
D
S
D
S
D
S
CONTROL
CONTROL
CONTROL
X
M
X
R
2 MΩ
22 kΩ
L
IL
F
C
C
C
R
LS
For R
See fig. 55 for other
resistor values (R
For R
For Value Shown
V
V
I
I
LIMIT
LIMIT
IL
UV
UV
IL
= 12 kΩ
= 25 kΩ
= R
= 100 VDC
PI-2510-040501
= 43%
PI-2617-050100
= 69%
C S
PI-2623-040501
C L X S F
LS
x I
UV
IL
D
D
)
Figure 19. Line-Sensing for Overvoltage Only (Under-Voltage
Figure 21. Current Limit Reduction with Line Voltage.
Figure 17. Line-Sensing for Under-Voltage, Overvoltage and
Voltage
Voltage
Voltage
Input
Input
Input
DC
DC
DC
+
+
+
Disabled). Maximum Duty Cycle will be reduced at
Low Line.
Line Feed Forward.
-
-
-
R
LS
2.5 MΩ
R
D
S
D
S
D
S
LS
R
CONTROL
CONTROL
CONTROL
LS
X
R
6 kΩ
L
L
2 MΩ
30 kΩ
IL
2MΩ
C
I
I
C
C
LIMIT
LIMIT
For R
DC
DC
V
V
V
V
MAX
MAX
UV
OV
UV
OV
1N4148
=
=
For Values Shown
LS
= I
= 450 VDC
100% @ 100 VDC
63% @ 300 VDC
= I
= 100 VDC
@100 VDC = 78%
@375 VDC = 38%
V
V
= 2 MΩ
OV
OV
OV
UV
= 450 VDC
x R
x R
= I
PI-2620-040501
PI-2624-040501
PI-2618-040501
OV
LS
LS
x R
LS