Vicor VI Chip High Voltage BCM Bus Converter 6123 Evaluation Board - Manual (Page 5)

UG:015 vicorpower.com Applications Engineering: 800 927.9474 Page 5
Using the High Voltage BCM ® Bus Converter 6123 Evaluation Board (Cont.)
+ IN, –IN
Connect a high-quality, low-noise power supply to the +IN and –IN terminals of the
evaluation board. The interconnect leads should be capable of the rated DC current and
as short as possible. Additional capacitance may be required on the evaluation board to
compensate for impedances in the interconnect leads and source supply. It is important
to remember that noise from the source and voltage drops, will appear at the output
of the bus converter multiplied by its K factor. Test points +IN and –IN can be used to
monitor the input and are located on the PCB top left corner.
+ OUT, –OUT
An electronic or passive load could be connected to +OUT and –OUT terminals. Most
commercially available electronic loads do not have current slew rates capable of fully
exercising the BCM module. Test points +OUT and –OUT can be used to monitor the
output and are located on the PCB top right corner.
Output Voltage Measurement Jack (J104)
This connector is kelvin connected to the module output pins providing accurate
measurements of the output voltage ripple of the BCM module. Many types of scope
probes may be directly connected to this point.
Input Current Measurement
A current probe can be used when adding a wire loop to R102 side VIAs and removing
R102 resistor. Input bulk capacitor C104 is downstream of this measurement point.
Output Current Measurement
A current probe can be used when adding a wire loop to R110 and R111 side VIAs and
removing both R110 and R111 resistors.
Temperature Monitor (TM)
The BCM TM pin outputs a 250 kHz PWM signal. A 1 kΩ and a 10 nF low pass filter
precedes the TM test point for measurement simplicity.
Enable Control (EN)
Connecting the BCM EN pin to –IN will disable the module. SW100 can be used to
disable for convenience. During normal operation or while V
IN
is applied this pin will
be high if read using a DMM through the EN test point.
Auxiliary Voltage Source (VAUX)
The BCM VAUX can be used as a fault flag as well as an auxiliary 3.3 V up to 4 mA
current capability. An LED is placed on this pin indicating operation. A test point is
also provided.