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TPS4H000-Q1: Relationship Between VCL(th) and K(CL)

Shinichi Inoue
Guru 21646 points
Part Number: TPS4H000-Q1

Dear Specialists,

My customer is considering TPS4H000A-Q1 and has a question.

I would be grateful if you could advise.

---

According to the datasheet 8.3.3, V CL(th) is the internal band-gap voltage. K (CL) is the ratio of the output current and the current-limit set value. It is constant across the temperature and supply voltage.

Does this mean that V_CL (th) and K (CL) are constant with respect to temperature？

On the other hand, Figure19-22 shows the temperature dependence of Current Limit Ratio.

They seem to be inconsistent.

How do you think about them?

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I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Mastermind 28200 points
    Hello,
    The current ratio KcL variation with temperature relative to total variation, is low. For example at 100mA current limit the KcL variation is -20% to +20%. The variation with temperature (fig 20) is -2.5% to 1.5%. I believe this the reason behind the statement in paragraph 8.3.3.
    The total current limit tolerance in the parametric table (page 7) should be considered.
    Regards
  • 0 in reply to Mahmoud Harmouch
    Guru 21646 points

    Hi Mahmoud,

    Thank you for your reply.

    I understand In Section 8.3.3 it is described as a constant, but there are actually temperature variations rather smaller than Kcl variations.

    I'll share your suggestion with the customer.

    I appreciate your great help.

    Best regards,

    Shinichi