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CONNECTIONS and OPERATING INSTRUCTIONS
Input Supplies Connection:
Two supplies are required for this board, 3.3V and 12V. Both supplies should be well regulated. The 3.3V
supplies the pull-up resistor for Power Good. The Track and Seq pins are also pulled high using 3.3V. Connect
the 3.3V supply to TP3(+) and TP4(Gnd). The12V supply is the bus voltage; It also biases IR3622 IC and
should be able to source 15A current. Connect this supply either to 8-pin connector (J1B) or solder other
connectors, such as banana jacks, to the exposed pads.
Note: For correct start up the 3.3V supply needs to be powered first.
Output Load Connection:
The load can be connected to the large screw-terminals or solder other connectors such as banana jacks, to
the exposed pads.
Table I. Connections
Signal Name
+3.3V Supply
Ground of the 3.3V Supply
V IN (+12V)
Ground of V IN
V OUT ( +1.8V)
Ground of V OUT
Connection
TP3
TP4
J1B
TB1B, TB2B
TB3B, TB4B
www.irf.com
RD-0622
3
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