CONTROL FUNCTIONS - PC PIN
Module Enable/Disable
The module may be disabled by pulling PC below 2.3V with
respect to the 鈥揑nput. 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
鈥淥R鈥檌ng鈥?diodes. See Figure 1.
Primary Auxiliary Supply
At 5.7V, PC can source up to 1.5mA. In the example shown in
Figure 3, PC powers a module enabled LED.
Module Alarm
The module contains 鈥渨atchdog鈥?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 2 and 4.
+In
PC
+In
SW1
Auto
Restart
2-20ms typ.
f (VIN)
Input Undervoltage
Input Overvoltage
Overtemperature
Module Faults
50惟
SW2
SW3
1K
+Out
+S
SC
鈥揝
PC
SW1, 2, & 3
shown in
"Fault" position
Disable
PR
鈥揑n
PR
鈥揑n
5.7Vdc
(0-3mA)
1.23
Vdc
6K
鈥揙ut
Disable = PC <2.3V
Figure 1鈥擬odule
enable/disable.
Figure 2鈥擯C/SC
module alarm logic.
+In
Fault
PC
40渭s typ.
5.7V
PC
"Module
Enabled"
4k惟
PR
鈥揑n
SC
1.23V
2-20ms typ.
Figure 3鈥擫ED
on-state indicator.
Figure 4鈥擯C/SC
module alarm timing.
Optocoupler
+In
PC
4k惟
PR
鈥揑n
+Out
+S
SC
鈥揝
鈥揙ut
1.00V
Alarm
Figure 5鈥擨solated
on-state indicator.
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
Figure 6鈥擲econdary
side on-state indicator.
FasTrak Maxi E-Grade Family
Rev. 1.1
Page 4 of 8
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