UCC3912 Datasheet | Unitrode

description The UCC3912 family of hot swap power managers provides plete power management, hot swap capability, and circuit breaker functions. The only ponent required to operate the device, other than supply bypassing, is the fault timing capacitor, CT. All control and housekeeping functions are integrated, and externally programmable. These include the fault current level, maximum output-sourcing current, maximum fault time, and startup delay. In the event of a constant fault, the internal fixed 3% duty cycle ratio limits average output power. The internal 4-bit DAC allows programming of the fault level current from 0 A to 3 A with 0.25-A resolution. The IMAX control pin sets the maximum sourcing current to 1 A above the fault level when driven low, and to a full 4 A when driven high for applications which require fast output capacitor charging. When the output current is below the fault level, the output MOSFET is switched on with a nominal on resistance of 0.15 Ω. When the output current exceeds the fault level, but is less than the maximum sourcing level, the output remains switched on, but the fault timer starts charging CT. Once CT charges to a preset threshold, the switch is turned off, and remains off for 30 times the programmed fault time. When the output current reaches the maximum sourcing level, the MOSFET transitions from a switch to a constant current source. (continued) block diagram IMAX 10 H=4A CHARGE PUMP REVERSE VOLTAGE PARATOR 4A 1A ABOVE FAULT 0 A- 3 A 0.25 RES MAX CURRENT LEVEL CURRENT SENSE + - LINEAR CURRENT AMPLIFIER CURRENT FAULT LEVEL 0A TO 3 A + - OVERCURRENT PARATOR ON TIME CONTROL 3% DUTY CYCLE THERMAL SHUTDOWN INTERNAL BIAS 30 m V - + VOUT H = OPEN + 2 VIN 3 VIN POWER FET 1.5 V + - 14 VOUT 15 VOUT 1 SHTDWN 6789 B3 B2 B1 B0 4 BIT DAC 5 4 13 12 GND HEATSINK GND PINS 11 CT 16 FAULT UDG-99146 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of...