VTM-CB (Figure 4)
The VTM® module provides the isolation stage and the output voltage step down. When paired with
the PRM the chip set forms a traditional DC-DC converter. The -CB board for the VTM is intended to
be used in conjunction with the PRM-CB; nevertheless, in order to test this standalone, it is possible to
inject a VC pulse as specified in the data sheet to the exposed lead from the header corresponding to
the VC pin. Refer to the board schematic Figure 5 for the appropriate pin(s.) An impedance
measurement may prove just as expeditious.
3
Figure 4
VTM-CB
5
1
2
4
3
Board Overview
1
Source voltage input points (Item 1) are designed to accommodate #10 hardware and Panduit ring
lugs. BE CERTAIN POLARITY IS CORRECT BEFORE APPLYING POWER.
2
Input connector J01 (Item 2) mates with PRM-CB providing Vin and VC. As can be seen from the
following schematic there are four pins dedicated to the + In, four for the -In, and two for the
VC. Each contact is rated for 3 A. The excess capacity afforded by these pins can facilitate testing
multiple VTM-CBs from a single PRM-CB using an appropriate wiring harness and mating
connector. This may also be achieved using the large pads of Item 1.
Note: There is a removable male to male insert installed into this connector. This allows the
mate to be either gender which may be important depending upon the availability of connectors.
The Kelvin connection points for Vin and Vout (Item 3) are for use in efficiency measurements.
The scope jack (Item 4) is used to view output voltage parameters.
3
4
5
Output voltage points (Item 5) are designed to accommodate #10 hardware and Panduit
ring lugs.
UG:003
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