HV111

The HV111 is a complete power management solution for switched or pluggable backplane applications up to 1.65A, running from 8.0 to -80V, requiring no external components or programming in many applications. It is not limited to only negative input voltages. It can also be used in +8.0 to +80V systems.

An internally programmed supervisor UVLO/ ENABLE may be overridden with external resistors for custom settings. Satisfying this supervisor will begin a POR phase to ensure de-bouncing. Thereafter, a servo loop controls an internal 80V, 2A pass element to limit current. The circuit HV111 uses internal mirrors to measure current, eliminating the need for a sense resistor.

The HV111 includes two current modes: i) initial current limit mode limits the current to 1.2A during turn on; ii) thereafter a 2A monitor circuit will re-trigger the servo mechanism back to 1.2A limit if it is tripped. An on-board thermal supervisor ensures that the device can never be damaged by over current conditions.

Circuit breaker functionality is obtained through a either a current limit timeout or a PWM current limiter for severe faults. If the servo limits for more than 75ms then the part will shut down the pass element, and initiate a 9sec timer after which the turn on sequence will restart.

The HV111 is available in a thermally rugged DPAK-5 package which provides improved thermal resistance when compared to SO-8 based solutions.