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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 TP1(+) and TP2(Gnd). The12V supply is the bus voltage; It also biases IR3622 IC and
should be able to source 10A current. Connect this supply either to 8-pin connector (J1A) 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 O1 (+2.5V)
Ground of V O1 (+2.5V)
V O2 (+1.8V)
Ground of V O2 (+1.8V)
Connection
TP1
TP2
J1A
TB1A
TB2A
TB3A
TB4A
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RD-0621
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