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TOP264-271
Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins (cont.)
+
R LS
2.5 M ?
I LIMIT = 100% @ 100 VDC
I LIMIT = 53% @ 300 VDC
+
Q R can be an optocoupler
output or can be replaced by
a manual switch.
DC
Input
Voltage
D
CONTROL
C
DC
Input
Voltage
D
CONTROL
C
S
X
S
X
-
R IL
6 k ?
-
Q R
47 K ?
ON/OFF
Figure 19. Current Limit Reduction with Line Voltage.
PI-5465-061009
PI-5466-061009
Figure 20. Active-on (Fail Safe) Remote ON/OFF, and Latch Reset.
+
Q R can be an optocoupler
output or can be replaced
by a manual switch.
For R IL = 12 k ?
+
R LS
V UV = I UV × R LS + V V (I V = I UV )
V OV = I OV × R LS + V V (I V = I oV )
4 M ? DC MAX @100 VDC = 76%
DC MAX @375 VDC = 41%
DC
Input
Voltage
D
S
CONTROL
X
C
I LIMIT = 61%
For R IL = 19 k ?
I LIMIT = 37%
DC
Input
Voltage
D
S
V
CONTROL
X
C
Q R can be an optocoupler
output or can be replaced
by a manual switch.
For R IL = 12 k ?
I LIMIT = 61%
-
R IL
Q R
16 k ?
ON/OFF
-
R IL
Q R
16 k ?
ON/OFF
PI-5531-072309
Figure 21. Active-on Remote ON/OFF with Externally Set Current Limit,
and Latch Reset
PI-5467-061009
Figure 22. Active-on Remote ON/OFF with Line Sense and External
Current Limit, and Latch Reset.
+
R LS
4 M ?
V UV = I UV x R LS + V V (I V = I UV )
V OV = I OV x R LS + V V (I V = I oV )
For R LS = 4 M ?
V UV = 102.8 VDC
V OV = 451 VDC
+
D
Typ. 65 VAC brownout threshold.
<3 s AC latch reset time.
Higher gain Q R allows increasing R1/
decreasing C1 for lower no-load input
power.
DC
Input
Voltage
-
D
S
V
CONTROL
X
R IL
12 k ?
DC MAX @ 100 VDC = 76%
DC MAX @ 375 VDC = 41%
C
For R IL = 12 k ?
I LIMIT = 61%
See Figure 37 for
other resistor values
(R IL ) to select different
I LIMIT values.
DC
Input
Voltage
-
S
CONTROL
X
R IL
C
Q R
R1
4 M ? 1N4007
AC
R2 C1 Input
39 k ? 47 nF
PI-5652-110609
Figure 23. Line Sensing and Externally Set Current Limit.
14
Rev. E 08/12
Figure 24. Externally Set Current Limit, Fast AC Latch Reset and Brown-Out.
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