TPS1HTC100-Q1: Unknown parameter in the calculation of the total power consumption

Shunsuke Yamamoto

Expert 7821 points

Part Number: TPS1HTC100-Q1

Tool/software:

Hi team,

What is the value of I_NOM in the equation 15 on the datasheet regarding the total power consumption of TPS1HTC100-Q1?

Best regards,

Shunsuke Yamamoto

1 month ago

0 Rishika Patel 1 month ago

TI__Expert 8001 points

Hi Shunsuke,

For power dissipation, please use P = I^2 x RON. Also, consider the switching losses during turn on and turn off.

Please see section 2.4.1 Power Dissipation Calculation in the following application note - How To Drive Resistive, Inductive, Capacitive, and Lighting Loads (Rev. E).

Thanks,

Rishika Patel

0 Shunsuke Yamamoto 1 month ago in reply to Rishika Patel

TI__Expert 7821 points

Hi Rishika,

Thank you for the reply. May I know the INOM on the datasheet? I am not asking how to calculate the power dissipation.

Do you mean users can ignore the calculation of Vs x INOM? If so, please kindly fix the datasheet. Users will misunderstand the calculation of the power dissipation.

Best regards,

Shunsuke Yamamoto

0 Rishika Patel 1 month ago in reply to Shunsuke Yamamoto

TI__Expert 8001 points

Hi Yamamoto-san,

Yes, please ignore the VS x IMON term. However, please consider the switching losses as shown above.

Thanks,

Rishika Patel

0 Shunsuke Yamamoto 1 month ago in reply to Rishika Patel

TI__Expert 7821 points

Hi Rishika,

Thank you for the reply.

1. May I know the INOM on the datasheet?

2. Could you please kindly consider fixing the datasheet?

3. Could you please let me know the equation of switching loss?

Best regards,

Shunsuke Yamamoto

+1 Rishika Patel 1 month ago in reply to Shunsuke Yamamoto

TI__Expert 8001 points

Hi Yamamoto-san,

1. INOM is the typical load current for your system.

2. Yes, we will consider this, sorry for the confusion.

3. Since EON/EOFF are not specified in the datasheet, please use the following equations from section 2 Device Thermals in the Driving PWM Loads with TI High-Side Switches application note.

Thanks,

Rishika Patel

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TPS1HTC100-Q1: Unknown parameter in the calculation of the total power consumption