TPS54202: EN-pin

Takashi Yamaguchi

Part Number: TPS54202

Hi team,

My customer is considering to use the TPS54202.

According to the block diagram in the d/s, the EN-pin is connected to a current source. What voltage is the current source connected internally?

Regards,

Yamaguchi

over 3 years ago

0 Young Zhao over 3 years ago

TI__Genius 9280 points

Hi,

May I ask why you need this value ? Normally we only need the current value and EN threshold to set external UVLO .You can refer the details in DS page 10/below.

BRs,

Young

0 Takashi Yamaguchi over 3 years ago in reply to Young Zhao

TI__Genius 11090 points

Hi Young-san,

Thank you for your support.

The customer is thinking to control the EN-pin directly by controller IC like MCU. The controller IC I/O is 3.3V, and abs max of the I/O-pin is 4.6V. Therefore, customer is concerned about the voltage from EN-pin being applied to the I/O-pin and exceed the 4.6V. Therefore, customer would like to know what voltage is the current source connected internally.

Regards,

Yamaguchi

0 Young Zhao over 3 years ago in reply to Takashi Yamaguchi

TI__Genius 9280 points

and Hi ,

EN pin is a input pin for this device with large internal resistance.

It is no problem for EN pin connected with external voltage controller , and suggest to put a resister in series .

BRs,

Young

0 Takashi Yamaguchi over 3 years ago in reply to Young Zhao

TI__Genius 11090 points

Hi Young-san,

Thank you for the answer.

Could you tell me why does it require a resistor in series? Also, could you tell me the recommended resistance?

Regards,

Yamaguchi

0 Young Zhao over 3 years ago in reply to Takashi Yamaguchi

TI__Genius 9280 points

Hi Yamaguchi,

A resistor in series is for current limiting , and one 10K ohm is recommended .

BRs,

Young

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TPS54202: EN-pin