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.
1. Detection of DC currents flowing in the output transistorsIn normal operation, with an AC coupled load, continuous DC currents of greater than several mA will notflow in the output transistors. If a current greater than 150mA (nominal) flows in either output transistor for aduration greater than 4ms then the IFAULT condition will be activated and that channel will be placed intri-state. The exact time before the IFAULT is activated is a function of the voltage across the transistorconducting >150mA load current. Larger voltages across this transistor will cause the deglitch time to beshorter. With VS = 38V and with the output at VS/2 the minimum deglitch time is 4us. The deglitch timer isreset when the current level falls below 150mA.
refer to p.19 & p.21
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