The exposed pad on the MAX256 is intended as a thermal connection only. It cannot be used as the only ground connection and excessive shutdown current may be seen if it is used as the return current path.
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Question:
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MAX256
Production
The MAX256 is an integrated primary-side controller
and H-bridge driver for isolated power-supply circuits.
The device contains an on-board oscillator...
Datasheet
MAX256 on Analog.com
The exposed pad on the MAX256 is intended as a thermal connection only. It cannot be used as the only ground connection and excessive shutdown current may be seen if it is used as the return current path.