LM34936-Q1: input voltage ripple requirement

Takahiro Saito

Expert 5315 points

Part Number: LM34936-Q1

Hi team,

Customer is going to use LM34936-Q1 with below Vin ripple condition.

Vin : 21V

Input ripple voltage : 600mVp-p

Ripple frequency : 400kHz

Is these ripple no problem to the device behavior?

Because Figure 8-1 in the datasheet uses RC Filter(10ohm + 0.1uF) to VIN pin.

So, I'm concerned about if there are some noise requirement on th VIN pin.

Please check if LM34936-Q1 is no problem on above the ripple in the input voltage.

Regards,

Saito

over 2 years ago

0 Stefan Schauer over 2 years ago

TI__Mastermind 42251 points

Hi Saito,

thank you for promoting BCS devices.

Please let me investigate on this. I will come back in 2-3 days.

Best regards,

Stefan

0 Takahiro Saito over 2 years ago in reply to Stefan Schauer

TI__Expert 5315 points

Hi Stefan-san,

I hope you could get the answer of this question. Coudl you give me the update?

Regards,

Saito

0 Stefan Schauer over 2 years ago in reply to Takahiro Saito

TI__Mastermind 42251 points

Hi Saito-san,

sorry for the delay. Just received the answer back.

The input voltage ripple of 600mV should not make any issue. The already available RC Filter(10ohm + 0.1uF) to VIN pin has a corner frequency much below the 400kHz and can filter this.

Best regards,

Stefan

0 Takahiro Saito over 2 years ago in reply to Stefan Schauer

TI__Expert 5315 points

Hi Stefan-san,

Thank you for your quick response. I answered it to customer. If I need further help, I will let you know in this thread.

Regards,

Saito

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LM34936-Q1: input voltage ripple requirement