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TOP254PN Datasheet(PDF) 17 Page - Power Integrations, Inc.

Part No. TOP254PN
Description  Enhanced EcoSmart®, Integrated Off-Line Switcher with Advanced Feature Set and Extended Power Range
Download  48 Pages
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TOP254PN Datasheet(HTML) 17 Page - Power Integrations, Inc.

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


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