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S28A5C175B2 Datasheet(PDF) 8 Page - Vicor Corporation

Part # S28A5C175B2
Description  DC-DC Converter Module
Download  12 Pages
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Manufacturer  VICOR [Vicor Corporation]
Direct Link  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

S28A5C175B2 Datasheet(HTML) 8 Page - Vicor Corporation

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28 V Wide Maxi Family
Rev 2.8
vicorpower.com
Page 8 of 12
02/2016
800 927.9474
28 V Input
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.
+IN
PC
PR
–IN
Disable
Disable = PC <2.3 V
Figure 2 — Module enable / disable.
Figure 4 — LED on-state indicator.
+IN
PC
PR
–IN
4 kΩ
"Module
Enabled"
+IN
PC
PR
–IN
Optocoupler
4 kΩ
Alarm
1.00V
+OUT
+S
SC
–S
–OUT
Comparator
+OUT
+S
SC
–S
– OUT
+IN
PC
PR
–IN
Input Undervoltage
2-20 ms typ.
f (VIN)
Auto
Restart
5.7 Vdc
(0-3 mA)
50 Ω
SW2
SW3
1.23
Vdc
6 K
1 K
SW1
SW1, 2, & 3
shown in
"Fault" position
Input Overvoltage (See Note 1)
Overtemperature
Module Faults
1 Not applicable for 300 Vdc input family
1 M
Figure 3 — PC/SC module alarm logic.
Figure 6 — Isolated on-state indicator.
2–20 ms typ.
Fault
SC
PC
1.23 V
5.7 V
40 μs typ.
Figure 5 — PC/SC module alarm timing.
Figure 7 — Secondary side on-state indicator.
PRIMARY CONTROL - PC PIN


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