TPS51220A/about switching jitter

Tsukui Yusuke

Guru 21930 points

Other Parts Discussed in Thread: TPS51220A

Hi,

Could you tell me about TPS51220A swiching jitter?
Please confirm the attached file.
TPS51220A.pdf

Customers are using EVM following conditions.
・Vin=16V
・Vout=5V
・Iout=6A
・Mode=CCM

Is this normal operate?
Can I reduce this jitter?

Best regards,
Yusuke/Japan Disty

over 7 years ago

0 Mike(DC/DC) Wang over 7 years ago

TI__Intellectual 1820 points

Hello,
as I see, the waveform is good.
can you show more detail when you say "Frequency variation→ 694kHz/676kHz"?
which mode you used? DCAP or current mode?

regards
Mike

0 Tsukui Yusuke over 7 years ago in reply to Mike(DC/DC) Wang

Guru 21930 points

Mike-san,

Thank you for your response.
Customer is using the current mode.

"Frequency variation→ 694kHz/676kHz"?
Customers are considered as jitter this frequency variation.
Does this device will change freqency in current mode condition?

Best regards,
Yusuke/Japan Disty

0 Mike(DC/DC) Wang over 7 years ago in reply to Tsukui Yusuke

TI__Intellectual 1820 points

Yusuke-san,

this device is fix frequency device, no jitter inside

regards

Mike

0 Tsukui Yusuke over 7 years ago in reply to Mike(DC/DC) Wang

Guru 21930 points

Hi Mike-san,

Thank you for your support.
Let me ask you one more thing.
Why occur periodic change of frequency variation?
0842.TPS51220A.pdf

Best regards,
Yusuke/Japan Disty

Power management

Power management forum

TPS51220A/about switching jitter