We do not need an auxiliary power supply to run the control IC. The battery pack provides
an “ instant-on ” power supply for the control IC. A single battery will not provide enough
voltage to drive the switch when the battery is fully discharged, and two batteries supply
too much voltage when the batteries are fully charged. We will use two batteries and
reduce the voltage to provide the IC control voltage. We do not need soft start operation,
since the load will be supplied by the battery until the output reaches the battery voltage.
11.4 Output Converter Detailed Design
Push-pull operation is a reasonable choice for the output con ...
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