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TPIC84134-Q1 output resistor ?

TPIC84134-Q1 output resistor ?

This question is answered
elsalvador
Posted by elsalvador
on Feb 07 2012 19:47 PM
Intellectual420 points

Dear TI-er.

My customer will design TPIC84134-Q1 .

How I calculate R4 value ?

How I calculate R4 watt value ?

How much is thermal cut time value ?

plz help me.

 

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  • elsalvador
    Posted by elsalvador
    on Feb 21 2012 11:50 AM
    Verified Answer
    Verified by elsalvador
    Intellectual420 points

    Datasheet p.10

    1. Detection of DC currents flowing in the output transistors
    In normal operation, with an AC coupled load, continuous DC currents of greater than several mA will not
    flow in the output transistors. If a current greater than 150mA (nominal) flows in either output transistor for a
    duration greater than 4ms then the IFAULT condition will be activated and that channel will be placed in
    tri-state. The exact time before the IFAULT is activated is a function of the voltage across the transistor
    conducting >150mA load current. Larger voltages across this transistor will cause the deglitch time to be
    shorter. With VS = 38V and with the output at VS/2 the minimum deglitch time is 4us. The deglitch timer is
    reset when the current level falls below 150mA.

    refer to p.19 & p.21

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