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BTS5180: To avoid high Is (fault), can a resistor in series with Rsense help?

BTS5180: To avoid high Is (fault), can a resistor in series with Rsense help?

Infineon_Team
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50 replies posted 25 likes received 25 replies posted

A series resistance can limit the current on pin IS, as the internal circuit comes to saturation earlier. However, V_ADC should not be considered when calculating RGES (Rseries+R20).

Rather, the calculation should look like this: RGES= (VS– Vsat)/ 6mA RGES= (24V – 2V)/ 6mA = 3666Ω

V_ADC then needs to be considered for the voltage divider: (VS-Vsat)/ RGES= VADC/ R20
The Application Note, chapter 4.3, provides a better method to calculate the losses in the sense resistor.

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