TPS552882: TPS552882 switching frequency setting

Akihisa Tamazaki

Part Number: TPS552882
Other Parts Discussed in Thread: LM5145

Hello Team,

The customer would like to confirm whether TPS552882 support the following operation.

To be specific, at first TPS552882 is turned on by the internal clock (frequency setting by SFW pin), then FPGA starts operating and outputs an external SYNC clock, after that LM5145 operates in synchronization with the external clock from FPGA.

Is it possible to operate above using TPS552882?

Your advice would be so appreciated.

Best Reagrds,
Akihisa Tamazaki

over 4 years ago

0 Jasper Li over 4 years ago

TI__Mastermind 46905 points

Hi Akihisa,

i'm not fully sure about your question. the device operates at the frequency setting by FSW pin, until a external clock with frequency of 70%~130% of the setting value is applied to Sync pin.

is this the behavior you need.

0 Akihisa Tamazaki over 4 years ago in reply to Jasper Li

TI__Genius 12230 points

Jasper-san,

Thank you for your comment.
I have an additional question about reverse operation.
Does the device operate at the frequency setting by FSW pin if the external clock with frequency of 70%~130% of the setting value is removed at Sync pin?

Your advice would be so appreciated.

Best Regards,
Akihisa Tamazaki

0 Jasper Li over 4 years ago in reply to Akihisa Tamazaki

TI__Mastermind 46905 points

Hi Akihisa,

yes, you are correct. if you need synchronous function, please set the device to force PWM mode. refer to setting in MODE pin.

0 Akihisa Tamazaki over 4 years ago in reply to Jasper Li

TI__Genius 12230 points

Jasper-san,

Thank you for your comment.
I understand.

Best Regards,
Akihisa Tamazaki

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TPS552882: TPS552882 switching frequency setting