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300 V Input
PRIMARY CONTROL - PC PIN
Module Enable/Disable
The module may be disabled by pulling PC below 2.3 V with
respect to the –Input. This may be done with an open collector
transistor, relay, or optocoupler. Multiple converters may be
disabled with a single transistor or relay either directly or via
“OR’ing” diodes. See Figure 2.
Primary Auxiliary Supply
At 5.7 V, PC can source up to 1.5 mA. In the example shown
in Figure 4, PC powers a module enabled LED.
Module Alarm
The module contains “watchdog” circuitry which monitors
input voltage, operating temperature and internal operating
parameters. In the event that any of these parameters are
outside of their allowable operating range, the module will
shut down and PC will go low. PC will periodically go high
and the module will check to see if the fault (as an example,
overtemperature) has cleared. If the fault has not been cleared,
PC will go low again and the cycle will restart. The SC pin
will go low in the event of a fault and return to its normal
state after the fault has been cleared. See Figures 3 and 5.
Input Undervoltage
+IN
PC
+IN
PC
SW1
Auto
Restart
2-20 ms typ.
f (VIN)
Input Overvoltage (See Note 1)
Overtemperature
Module Faults
50 Ω
+OUT
+S
Disable
PR
–IN
PR
–IN
1M
SW1, 2, & 3
shown in
"Fault" position
5.7 Vdc
(0-3 mA)
SW2
SW3
1.23
Vdc
1K
6K
SC
–S
– OUT
1 Not applicable for 300 Vdc input family
Disable = PC <2.3 V
Figure 2 — Module enable/disable.
Figure 3 — PC/SC module alarm logic.
"Module
Enabled"
4 k Ω
+IN
PC
PR
Fault
PC
5.7 V
40 μ s typ.
–IN
SC
1.23 V
2–20 ms typ.
Figure 4 — LED on-state indicator.
Figure 5 — PC/SC module alarm timing.
Optocoupler
4 k Ω
+IN
PC
PR
–IN
+OUT
+S
SC
–S
–OUT
Comparator
1.00V
Alarm
Figure 6 — Isolated on-state indicator.
Figure 7 — Secondary side on-state indicator.
300 V Maxi Family
Page 9 of 13
Rev 9.1
4/2013
vicorpower.com
800 735.6200
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