LMZ31710: Rrt value when Fsw is 400kHz

Hirotsugu Kobayashi

Mastermind 8485 points

Part Number: LMZ31710

Hi, team.

Please tell me Rt value, when setting Fsw as 400kHz.

Best Regards,

over 6 years ago

0 J Arrigo over 6 years ago

TI__Mastermind 28020 points

A 255 kΩ resistor is required to set the Fsw of the LMZ31710 to 400 kHz.

0 Hirotsugu Kobayashi over 6 years ago in reply to J Arrigo

Mastermind 8485 points

Arrigo-san,
I have one more question.
What's Rt value, when setting it as 450kHz?

Because our user plan to use LMZ31710, 12Vin to 1.5V, 2.8V, 1.8V, 2.5V, 1.5V and 1.3V.
They would like to make all those operate by 500kHz, but only 1.3V is out of a recommendation area.
So they would like to operate only 1.3Vout by 400kHz or 450kHz.

Best Regards,

0 J Arrigo over 6 years ago in reply to Hirotsugu Kobayashi

TI__Mastermind 28020 points

A 200 kΩ resistor is required to set the Fsw of the LMZ31710 to 450 kHz.

0 Hirotsugu Kobayashi over 6 years ago in reply to J Arrigo

Mastermind 8485 points

Arrigo-san,

Our user want to use LMZ31710 in the following condition by a single frequency.
12Vin to 1.5V, 2.8V, 1.8V, 2.5V, 1.5V and 1.3V.
What is a recommended frequency in this condition?
In table.7
400kHz 1.1V to 2.5V
500kHz 1.4V t0 3.4V
Is 450kHz suitable?

Best Regards,

0 J Arrigo over 6 years ago in reply to Hirotsugu Kobayashi

TI__Mastermind 28020 points

Yes, for these application voltages, 450 kHz would be the recommended switching frequency.

A 200 kΩ resistor is required to set the Fsw of the LMZ31710 to 450 kHz.

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LMZ31710: Rrt value when Fsw is 400kHz