UG:020 Page 4
Board Description
The following section provides a detailed description of the evaluation board components, test
points and sockets.
General Components
1. DCM (PS01).
2. Input lugs: Sized for #10 hardware. Use these for making connection to the input source.
This board does not contain reverse polarity protection. Check for proper polarity before
applying the power.
3. Input fuse (F01 & F02): Appropriately rated for the DCM model on the board.
4. Input filter: Ceramic input capacitors (C01 – C03, C05 – C10), filtering inductor (L01, L02) and
damping resistor (R04) provide input filtering. Sockets (H01 – H02) can be used for easy
installation of aluminum-electrolytic input capacitors. This board also adds H05 – H06 for
additional input bypassing.
5. Enable / Disable switch (SW01): When actuator is in top position towards “ON” text on the
board, the ENABLE pin will be open and the DCM will be enabled. When actuator is in bottom
position towards “OFF” text on the board, the ENABLE pin will be connected to PRI_SG and
the DCM will be disabled. When switch SW01 is ON, an external voltage source can control the
ENABLE state.
6. Header-jumper for trim control (J03): Provides the option to enable the trim function to set the
DCM programmed trim value via either the on board trim rheostat or an external voltage source:
a. Using potentiometer (R02)
b. Using external voltage source.
7. Output lugs: Sized for #10 hardware. Use these lugs to connect the output directly to the load.
8. Output oscilloscope probe Jack (J13): Used for making accurate scope measurements of the
output voltage (e.g. ripple). The jack is directly compatible with many common passive voltage
probes models. Remove the grounding lead and insulating barrel of the probe and insert the
probe tip and barrel directly into the jack, ensuring that the probe tip seats in the center socket
of the jack. To avoid the risk of an inadvertent short circuit, do not attempt to install while power
is applied.
9. Output filter: Filtering inductor (L04) and damping network (L03, R24), and ceramic output
capacitors (C21 – C22, C24 – 26, C28, C31 – C32) provide output filtering. Sockets H08 – H09 can
be used for easy installation of aluminum-electrolytic output capacitors.
10. Dual paralleling wire-to-board connectors (J07 and J08): Used for bussing control signals
and their reference (ENABLE, TRIM, FAULT and PRI_SG) across board assemblies during parallel
operation. The connector style provides simple “strip and insert” use with 18 – 24AWG solid wires.
Once inserted, a spring loaded barb retains each wire with no need for soldering. To release the
wire, insert a thin bladed tool (AVX 06-9276-7001-01-000 or similar) into the slot above each
wire entry point.
