DESCRIPTION
The Functional Block Diagram for the HIP1031 shows the protection control circuit functions of over-current, overvoltage and over-temperature. A small metal resistor senses overcurrent in the power supply path of the pass transistor and load. Overvoltage detection and shutdown of the output driver occurs when a comparator determines that the supply voltage has exceeded a comparator reference level. Overtemperature is sensed from a VBE differential sense element that is thermally close to the output drive transistor. In addition to the input detected overvoltage protection, negative peak voltage of an inductive load is clamped with an internal zener diode. An internal bandgap supply voltage source provides a stable voltage reference over the chip operating temperature range, providing bias and reference control for the protection circuits. The HIP1031 is particularly well suited for driving lamps, relays, and solenoids in automotive and industrial control applications where voltage and current overload protection at high temperatures is required.
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