UCC3915 Datasheet | Unitrode

description The UCC3915 programmable hot swap power manager provides plete power-management, hot-swap capability, and circuit breaker functions. The only external ponent required to operate the device, other than power 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 2% 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 trip level or to a full 4 A of output current for fast output capacitor charging. (continued) block diagram IMAX 10 H=4A 4A 1A ABOVE FAULT MAX CURRENT LEVEL CURRENT FAULT LEVEL 0- 3 A 0- 3 A 0.25 RES CHARGE PUMP REVERSE VOLTAGE PARATOR - + + 30 m V VOUT CURRENT SENSE + - LINEAR CURRENT AMPLIFIER H = OPEN 2 VIN 3 VIN POWER FET - OVER CURRENT PARATOR + - ON TIME CONTROL 2% DUTY CYCLE THERMAL SHUTDOWN INTERNAL BIAS 14 VOUT 15 VOUT 1.5 V + - 1 SHTDWN 5 4 13 12 B3 B2 B1 B0 4 BIT DAC GND HEAT SINK GND PINS NOTE: Pin numbers refer to DIL-16 and SOIC-16 packages. 11 16 CT...