TPS61087 Oscillator frequency

T Kishi

Genius 4425 points

Other Parts Discussed in Thread: TPS61087

My customer has question.

Because customer are in quite a hurry, we want to cooperate.

1.TPS61087 change the frequency by temperature?

2.If any,Do you have [Osillator Frequency vs temperature]?(Graph, such as the Figure.6)

Regard

T Kishi

over 9 years ago

0 Helen chen over 9 years ago

TI__Mastermind 40080 points

Kishi,

1. Yes, TPS61087 change the frequency by temperature. From page 8 on the datasheet, it wrote"the frequency changes slightly because the voltage drop across the rDS(on) has some influence on the current and voltage measurement and thus on the on-time (the off-time remains constant)."

2. We have no Graph. Please check the data in the attached picture. These data also shown on page 4 of the datasheet.

Could you please share the detailed applicaiton infoeation with us? like Vin, Vo/Io and in what kind of equipment?

BR,

Helen

0 T Kishi over 9 years ago in reply to Helen chen

Genius 4425 points

Hi Helen

Thank you for reply.

Customers Spec is Below.
Vin=3.3V±5%
Vout=14V
Iout=200mA
Application：Optical Module

Regard

T Kishi

0 Helen chen over 9 years ago in reply to T Kishi

TI__Mastermind 40080 points

TPS61087 is just for this appllication. I think frequency is not an issue. Why they care about the operation frequency?

0 Helen chen over 9 years ago in reply to T Kishi

TI__Mastermind 40080 points

I'll test one plot for the customer on the EVM board based on these parameter. The plot will be ready today!

0 T Kishi over 9 years ago in reply to Helen chen

Genius 4425 points

Thank you for reply and support.
TPS61087 is not in issue.
Application is sensitive to noise.
For heat dissipation characteristics in the whole system is bad,
Customer are concerned about the TPS61087 frequency characteristics by heat temperature.

Best Regard
T Kishi

0 Helen chen over 9 years ago in reply to T Kishi

TI__Mastermind 40080 points

TPS61087 Oscillator frequency.xlsxThanks for the update. Now comes the TPS61087 frequency characteristics by heat temperature. Please check the attached file.

0 T Kishi over 9 years ago in reply to Helen chen

Genius 4425 points

Hi Helen
Thanks for your support.
We response to customer.

Best Regard
T Kishi

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TPS61087 Oscillator frequency