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TPS259827LEVM: Output Voltage Startup takes too long time

Part Number: TPS259827LEVM


Such as Figure1. When the Vin voltage is stable, if you turn on the Enable pin at this time, you will see that the Vout voltage slowly rising. What will happen in this situation?

And why is this caused? TPS2421 does not have this situation.

Figure1. TPS259827LEVM (startup)

Figure2. TPS2421-1DDAR (startup)