TOP252-262
Typical Uses of MULTI-FUNCTION (M) Pin (cont.)
+
+
Q
R can be an optocoupler
QR can be an optocoupler
output or can be replaced
by a manual switch.
output or can be replaced
by a manual switch.
For RIL = 12 k7
I
LIMIT = 61%
For RIL = 19 k7
LIMIT = 37%
DC
Input
Voltage
DC
Input
Voltage
I
D
S
M
D
S
M
RIL
CONTROL
CONTROL
QR
C
C
ON/OFF
QR
ON/OFF
47 k7
16 k7
-
-
PI-2519-040501
PI-4735-092107
Figure 38. Active-on Remote ON/OFF with Externally Set Current Limit
(see M Pin Operation Description).
Figure 37. Active-on (Fail Safe) Remote ON/OFF.
+
+
QR can be an optocoupler
output or can be replaced
by a manual switch.
VUV = IUV × RLS + VM (IM = IUV
VOV = IOV × RLS + VM (IM = IOV
)
)
For RLS = 4 M7
VUV = 102.8 VDC
VOV = 451 VDC
RLS
4 M7
ON/OFF
QR
DC
Input
Voltage
DC
Input
Voltage
Sense Output Voltage
7 k7
DCMAX @ 100 VDC = 76%
DCMAX @ 375 VDC = 41%
RMC
24 k7
RMC = 2RIL
D
S
M
D
M
10 k7
CONTROL
CONTROL
Reset
C
RIL
C
QR
12 k7
S
-
-
PI-4757-120307
PI-4736-060607
Figure 40. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Latched Output Overvoltage Protection with Device Reset.
Figure 39. Active-off Remote ON/OFF with Externally Set Current Limit
(see M Pin Operation Description).
20
Rev. F 01/09
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