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UCC3912DPTR Datasheet(PDF) 1 Page - Texas Instruments |
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UCC3912DPTR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 6 page UCC3912 SLUS241A - NOVEMBER 1999 FEATURES • Integrated 0.15Ω Power MOSFET • 3V to 8V Operation • Digital Programmable Current Limit from 0 to 3A • Electronic Circuit Breaker Function • 1µA ICC when Disabled • Programmable on Time • Programmable Start Delay • Fixed 3% Duty Cycle • Uni-Directional Switch • Thermal Shutdown • Fault Output Indicator • Maximum Output Current can be set to 1A above the Programmed Fault Level or to a full 4A • Power SOIC, Low Thermal Resistance Packaging DESCRIPTION The UCC3912 Hot Swap Power Manager provides complete power man- agement, hot swap capability, and circuit breaker functions. The only com- ponent required to operate the device, other than supply bypassing, is the fault timing capacitor, CT. All control and housekeeping functions are inte- grated, and externally programmable. These include the fault current level, maximum output sourcing current, maximum fault time,and start-up 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 to 3A with 0.25A resolution. The IMAX control pin sets the maximum sour- cing current to 1A above the fault level when driven low, and to a full 4A when driven high for applications which require fast output capacitor charg- ing. When the output current is below the fault level, the output MOSFET is switched on with a nominal on resistance of 0.15 . When the output cur- rent 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 re- mains 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) 6 7 8 9 1A ABOVE FAULT OVER CURRENT COMPARATOR CURRENT FAULT LEVEL 0–3 AMPS 10 H= 4A MAX CURRENT LEVEL 4A ON TIME CONTROL 3% DUTY CYCLE 0–3A 0.25 RES 11 13 12 4 5 B3 B2 B1 B0 4BIT DAC GND HEAT SINK GND PINS CT CHARGE PUMP 16 LINEAR CURRENT AMPLIFIER POWER FET 2 3 V OUT REVERSE VOLTAGE COMPARATOR 30mV FAULT THERMAL SHUTDOWN INTERNAL BIAS + – 1 15 14 VOUT VIN CURRENT SENSE H = OPEN 1.5V SHTDWN IMAX BLOCK DIAGRAM Programmable Hot Swap Power Manager UDG-99146 application INFO available |
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