Electrical load driving device including load current limiting circuitry

摘要

An insulated gate electrical load driving device includes simple and accurate gate control circuitry for limiting load current therethrough. Preferably, all circuitry is formed of a single integrated circuit having the insulated gate load driving device dielectrically isolated from the gate control circuitry. The gate control circuitry may include either one, or both, of a zener diode and a resistor divider. An input drive signal to the circuit is accurately controlled by the gate control circuitry to thereby limit the saturation current through the insulated load driving device, and hence the load current, to predetermined current level. Preferably, the predetermined saturation current level falls within a range of saturation currents of the insulated gate load driving device that is substantially constant over a wide operating temperature range.