TPS84620 RT/CLK resistance calculation formula

Bob Lee62837

Other Parts Discussed in Thread: TPS84620

Dear support team,

I decide the switching frequency of the TPS84620.
Could you teach the calculation formula for determining the resistance value of the RT / CLK?

Regard.
Bob Lee

over 10 years ago

0 JohnTucker over 10 years ago

TI__Guru**** 191445 points

The switching frequency to TPS84620 is internally set at 480 kHz. It is not meant to be adjusted except for external clock synchronization. See table 7 in the datasheet.

0 CY Hung over 10 years ago

TI__Intellectual 1710 points

Hi Bob,

Please refer to "Table 2" in TPS84620 datasheet, where showed the value of Rrt for various switching frequency.

Hope it help.

Hung

0 J Arrigo over 10 years ago

TI__Mastermind 28020 points

Refer to table 7 of the datasheet. This table shows the allowable output voltage range for several switching frequencies. These frequencies can be set by an external resistor or can be synchronized with an external clock.

0 Bob Lee62837 over 10 years ago in reply to J Arrigo

Mastermind 7230 points

Dear support team,

Thank you very much for answer.

May I ask a one more question?

Rrt number in Table 2 and Table 7, How they were calculated?
Is there a formula?

Regard.
Bob Lee

0 CY Hung over 10 years ago in reply to Bob Lee62837

TI__Intellectual 1710 points

Hi Bob. Please give me your email (mine is chung@ti.com). I will send you the spreadsheet. Thanks, Hung

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TPS84620 RT/CLK resistance calculation formula