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TPS7A4101: Poor load transient response

Part Number: TPS7A4101


Hi team,

 

My customer found that the load transient response of TPS7A4101 is very slow.

After a while from the start-up, when the load step from 0 A to several tens of mA occurs, it took several ms to settle to the target output voltage (ΔV~100mV).

The input voltage was enough stable.

 

Please find the measurement conditions below.

   VIN37V

   VOUT35V

   CIN4.7uF×3pcs

   R1472.7Ω

   R216kΩ

   CBYP10nF

   COUT4.7uF×3pcs

The passive designators are same as the datasheet schematic.

Unfortunately, the customer can’t show the waveform.

My customer found that the changing CBYP from 10nF to 1nF significantly improved this slow transient response.

 

Could you please advise how to improve the transient response?

The target settling time (within <100mV) is <1us.

 

Best regards,

Itoh