PRELIMINARY
Pin/Control Functions
+IN / –IN — DC Voltage Input Pins
+OUT / –OUT — DC Voltage Output Pins
The VICBrick DC-DC Converter input voltage range should
not be exceeded. The VICBrick’s internal under/over voltage
lockout-function prevents operation outside of the normal input
range. The VICBrick turns ON within an input voltage window
bounded by the "Input under-voltage turn-on" and "Input over-
voltage turn-off" levels, as specified. The module may be
protected against accidental application of a reverse input
voltage by the addition of a rectifier in series with the positive
input, or a reverse rectifier in shunt with the positive input
located on the load side of the input fuse.
The 0.060" diameter + and – output pins are rated for a
maximum current of 50 A. Two sets of pins are provided for all
units with a current rating over 50 A. These pins must be
connected in parallel with minimal interconnect resistance.
Output impedance
The very low output impedance of the VICBrick reduces
or eliminates the need for limited life aluminum electrolytic
or tantalum capacitors at the input of the non-isolated
point-of-load converters.
Input impedance
+SENSE / –SENSE — Remote Sense Pins
Vicor recommends a minimum of 10 µF bypass capacitance be
used on-board across the +IN and –IN pins. The type of
capacitor used should have a low Q with some inherent ESR
such as an electrolytic capacitor. If ceramic capacitance is
required for space or MTBF purposes, it should be damped with
approximately 0.3 Ω series resistance.
Remote sense minimizes the effects of distributiion losses by
regulating the voltage at the remote sense connections.
The DC resistance of the source should be kept as low as possible.
ON/OFF PIN
The ON/OFF pin provides the following Enable/Disable
functionality:
Standard "M" configuration — If the ON/OFF pin is left
floating, the module output is disabled. Once this port is pulled
lower than 0.7 Vdc with respect to –IN, the output is enabled.
This action can be realized by employing a relay, opto-coupler
or open collector transistor. This pin should not be toggled at a rate
higher than 1 Hz.
Optional "P" configuration — This is the reverse function
from above: when the ON/OFF pin is left floating, the module
output is enabled. Once this port is pulled lower than 1.7 Vdc with
respect to –IN, the output is disabled.
If not using the ON/OFF pin function, perform one of the
following to turn the converter on:
For M configuration, short ON/OFF pin to –IN.
For P configuration, leave ON/OFF pin open.
Vicor Corporation
Tel: 800-735-6200
vicorpower.com
VICBrick DC-DC Converter
Rev. 1.5
Page 7 of 14
VICOR [ VICOR CORPORATION ]
