OCP Threshold

Set an overcurrent trip point and size the reference network.

Formulas

Itrip = Vref / (Rshunt × G)

Vref = Idesired × Rshunt × G; G = Vref / (Idesired × Rshunt)

Rtop = Rbottom × (Vsupply / Vref − 1)

Error = (Itrip − Idesired) / Idesired × 100%; Pshunt = Itrip² × Rshunt

Suggested reset current = 0.95 × Itrip; hysteresis band = 0.05 × Vref

Model & assumptions

The hysteresis suggestion is a 5% engineering starting point, not a feedback-resistor design. Comparator topology, output levels, and propagation delay must be checked.

Divider mode reports an ideal Rtop and an E24 suggestion with its actual trip current.

Example with default inputs

Actual trip current

10 A

Comparator reference

2 V

Required / applied gain

20 V/V

Shunt voltage at trip

100 mV

Amplifier voltage at trip

2 V

Error from desired threshold

0 %

Suggested reset current

9.5 A

Suggested hysteresis band

100 mV

Shunt power at trip

1 W