TPS53355: TPS53355 control loop test.

Frank Xiao

Genius 12055 points

Part Number: TPS53355

Hi team,

My customer is using TPS53355 now. But when we test the control loop with AP 300. The cross frequency will change with the voltage injected. if the injecting voltage is smaller, the cross frequency will be higher. Do you know why? Thank you.

Frank

over 8 years ago

0 Vental Mao over 8 years ago

TI__Expert 5745 points

Hi:

what the schematic about this part? Does it use an external injection(DCAP-1) for the feedback?If yes, the traditional way to test the bode plot is not suitable.

And you need to use another way to test the bode plot for the DCAP-1 mode. For the detail, see the attachment.How_To_Measure_Bodeplots_for_DCAP_Regulator.pdf

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TPS53355: TPS53355 control loop test.