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TPS561208: vs. the TPS54320

Part Number: TPS561208
Other Parts Discussed in Thread: TPS54320,

Our end customer asked to relay a question. They used the TPS54320 on a previous design, and like the TPS561208, the absolute input voltage is 2-3 volts above the recommended maximum of 17 volts. On the TPS561208, they are seeing a shutdown at about 20 volts. They claim that they can put the input at 30 volts without incident on the TPS54320. Is there an explanation for the divergent observations ?