PIN / CONTROL FUNCTIONS
+In / -In DC Voltage Ports
The maximum input voltage should not be exceeded. The mod-
ules have internal over / undervoltage lockout functions that
prevent operation outside of the specified input range. They will
turn on when the input voltage rises above its undervoltage
lockout. If the input voltage exceeds the overvoltage lockout,
the module will shut down until the overvoltage fault clears. PC
will toggle indicating an out of bounds condition.
PC – Primary Control
The output voltage is enabled when the PC pin is open circuit
(floating). To disable the module’s output voltage, the PC pin is
pulled low (referenced to –IN). Open collector optocouplers,
transistors, or relays can be used to control the PC pin. During
an abnormal condition the PC pin will pulse (Figure 17) as the
module initiates a restart cycle. This will continue until the
abnormal condition is rectified. The PC pin should not be used as
an auxiliary voltage supply, nor should it be switched at a rate
greater than 1 Hz.
Figure 17 — PC module alarm logic
Figure 18 — Pin configuration (as viewed from pin side)
Figure 15 — Nominal line full load, turn on delay, Vin vs. Vout
Disable
Figure 16 — Module enable/disable.
VI Brick / 48V Input DC-DC Converter Modules
vicorpower.com
Rev. 1.0
Page 18 of 21
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