TOP252-262 POWERINT [Power Integrations, Inc.], TOP252-262 Datasheet - Page 17

• Manufacturer Part Number: TOP252-262
• Description: Enhanced EcoSmart, Integrated Off-Line Switcher with Advanced Feature Set and Extended Power Range
• Manufacturer: POWERINT [Power Integrations, Inc.]

Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins (cont.)
Figure 20. Line Sensing for Undervoltage Only (Overvoltage Disabled).
Figure 22. External Set Current Limit.
Figure 24. Active-on (Fail Safe) Remote ON/OFF.
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Voltage
Voltage
Input
Voltage
DC
Input
Input
+
DC
DC
+
+
-
-
-
6.2 V
D
S
D
S
D
S
CONTROL
Q
CONTROL
CONTROL
R
X
X
V
R
4 M
40 k
IL
47 K
Q
output or can be replaced by
a manual switch.
TOP259-261YN would
use the G pin as the
return for Q
R
C
C
C
can be an optocoupler
V
R
UV
For Values Shown
LS
See Figure 55b for other
resistor values (R
TOP259-261YN would
use the G pin as the
return for R
V
= R
ON/OFF
For R
UV
For R
I
I
R
LS
= 103.8 VDC
LIMIT
LIMIT
.
× I
IL
IL
= 19 k
= 12 k
= 61%
= 37%
UV
IL
PI-4720-120307
PI-4722-021308
PI-2625-011008
.
+ V
V
(I
IL
).
V
= I
UV
)
Figure 21. Line-Sensing for Overvoltage Only (Undervoltage Disabled). Maximum
Figure 23. Current Limit Reduction with Line Voltage.
Figure 25. Active-on Remote ON/OFF with Externally Set Current Limit.
Voltage
Voltage
Voltage
Input
Input
Input
Duty Cycle Reduced at Low Line and Further Reduction with
Increasing Line Voltage.
DC
DC
DC
+
+
+
-
-
-
R
LS
2.5 M
R LS
D
S
D
D
S
S
CONTROL
CONTROL
CONTROL
X
X
R
6 k
V
4 M
55 k
IL
TOP252-262
R
IL
For Values Shown
C
Q
C
C
V
V
R
Q
output or can be replaced
by a manual switch.
OV
OV
I
I
TOP259-261YN would
use the G pin as the
return for R
LIMIT
LIMIT
R
= I
= 457.2 VDC
can be an optocoupler
1N4148
TOP259-261YN would
use the G pin as the
return for Q
OV
16 k
=
=
100% @ 100 VDC
53% @ 300 VDC
× R
For R
For R
I
I
LIMIT
LIMIT
IL
LS
.
PI-4724-011008
PI-4721-120307
PI-4723-011008
IL
IL
+ V
ON/OFF
R
.
=
=
= 61%
= 37%
V
12 k
19 k
Rev. F 01/09
(I
V
17
= I
OV
)