Vicor VI Chip PRM Evaluation Board - Manual (Page 6)

UG:013 vicorpower.com Applications Engineering: 800 927.9474 Page 6
General Components (Cont.)
10. Signal connector (J10): Used to transfer VTM ® PC, IM, TM, -IN and Output Sense
signals between the PRM and VTM boards. TM pin of VTM provides feedback
to VT pin of PRM to enable temperature compensation in Adaptive Loop Operation
of PRM and VTM.
11. Power/Signal connector (J13): Used to transfer power (+OUT/-OUT) and VC to
downstream VTM board when used.
12. Output oscilloscope probe Jack (J14): Used for making the accurate scope
measurements of the output voltage (i.e. ripple). Remove scope grounding lead and
insert probe directly into jack ensuring a good connection between the jack and
the probe ground barrel. Do not attempt to install while power is applied. May not
be compatible with all scope probes.
13. Output capacitor (C
OUT
) and output filtering (inductor and ceramic capacitors):
Helps to minimize the switching ripple of the output voltage. Sockets can be used
for easy installation of aluminum-electrolytic output capacitor.
14. High-side current-sense resistor and current-sense IC (R25 and U10): Current-
sense shunt monitors the output current and IC provides the feedback to the IFB
pin for constant current limit protection in Remote Sense Operation. Gain is
programed using resistor R26. Constant current limit is set at ~10% above the
rated output current of the PRM ® on all boards.
15. Voltage sense and error amplifier: Dual op-amp provides the voltage sensing and
error amplifier function. It can be configured for local voltage sensing at the PRM
output or a differential amplifier to allow for non-isolated remote sensing at the
VTM ® output or load in Remote Sense Operation. Sockets are provided
for compensation components.
16. Voltage reference and output voltage trim pot (R44) for external voltage control
loop: Remote Sense Operation trim pot adjusts the output voltage by increasing
and decreasing the error amplifier reference voltage (V
REF
). Turn clockwise
to increase the output voltage and counterclockwise to decrease the output voltage.
Sockets can be used for easy installation of soft start ceramic capacitor.
17. Dual paralleling wire to board connectors (J17 and J18): Used for transferring
signal pins (ENABLE, SHARE and SGND) in parallel operation from one board
to other board. Provides simple strip and insert option. Accepts 18-24AWG solid
wires. Spring loaded contact will grab solid wire with no need for soldering.
Connection requires for parallel regulator operation are grouped together.
18. Push-pin heat sink and grounding clip mounting holes: Use these holes for
installing the optional push pin heat sink and grounding clips included
with the board. Use of the heat sink with fan is highly recommended
for appropriate cooling of the PRM module.