TPS23730: Rden Value

David Miller36

Part Number: TPS23730
Other Parts Discussed in Thread: TIDA-050045,

Hi,

The data sheet specifies that the value of Rden should be 25.5k. However, reference design TIDA-050045 and the TPS23730EVM-093 eval module both use 27.4k resistors.

Which is correct? Or is it to compensate for the lower resistance of the FET-diode bridge compared to the all diode bridge that the TPS23730 assumes?

Thanks,

David

over 4 years ago

0 Brett Colteaux over 4 years ago

TI__Expert 3700 points

Hi David,

You are correct, the 27.4k RDEN is because of the FET-diode bridge used.

For full diode bridge and full FET bridge, 25.5k detection resistor is used for RDEN.

Let me know if you have any additional questions about this. Thanks!

Best Regards,

Brett Colteaux

0 David Miller36 over 4 years ago in reply to Brett Colteaux

Prodigy 110 points

Thanks!

Similar question regarding CLSB: the data sheet says to use 130 ohms for PD Class 6. Both the above mentioned designs use 121 ohms.

0 Brett Colteaux over 4 years ago in reply to David Miller36

TI__Expert 3700 points

Hi David,

Ideally 130 ohm should be used for the CLSB resistor for Class 6 designs.

The 121 ohm used in the design needs to be updated. However, the design with the 121 ohm CLSB resistor will work just fine, is compliant and within the needed class current range.

Best Regards,

Brett Colteaux

0 David Miller36 over 4 years ago in reply to Brett Colteaux

Prodigy 110 points

Thanks Brett!

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TPS23730: Rden Value