Other Parts Discussed in Thread: TPS2553, TPS1663
Dear Teams,
Under certain conditions, TPS2663 turns off unintentionally.
The hardware configuration and TPS2663 circuit are as follows.
When the high power circuits are not operating, the TPS2663 continues to operate normally even if the Post-stage circuit starts operating and the inrush current flows.
However, when the high power circuit is operating, the TP2663 turns off unintentionally at the timing when the inrush current of the Post-stage circuit flows.
Malfunction is less likely to occur if either of the following plans is used.
①Do not connect 24V power supply in the system board
②Add capacitor to the input of a high power circuit
The cause cannot be identified because TPS2663 is unintentionally turned off even though the protection thresholds such as overcurrent, undervoltage, and overvoltage are not exceeded.
Please teach about the cause and countermeasures.
I suspect it is due to the input ripple voltage because the TPS2663 malfunctions when the high power circuit is operating and it becomes difficult to malfunction if the plans ① or ② above are used.
In the past, the TPS2553 had a malfunction of the FLT function, which was caused by exceeding the tolerable level of input ripple voltage, which is not described in the data sheet.
Does TPS2663 have the same input ripple voltage specifications as TPS2553?
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I have additional questions.
We also plan to use the TPS1H100 for the same purpose.
Does the TPS1H100 have input ripple voltage specifications?
Best regards,
