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UCC3921DG4 Datasheet(PDF) 3 Page - Texas Instruments |
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UCC3921DG4 Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 16 page  3 UCC1921 UCC2921 UCC3921 ELECTRICAL CHARACTERISTICS Unless otherwise specified, TA = 0°C to 70°C for the UCC3921 and –40°C to 85°C for the UCC2921, and –55°C to 125°C for the UCC1921; IVDD = 2mA, CT = 1nF (the minimum allowable value), there is no resistor connected between the SDFLTCH and VSS pins. TA =TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Output Section Output High Voltage IOUT = 0mA 8.5 10 V IOUT = –1mA 6 8 V Output Low Voltage IOUT = 0mA, VSENSE –VIMAX = 100mV 0 10 mV IOUT = 2mA, VSENSE –VIMAX = 100mV 200 600 mV Linear Amplifier Section Sense Control Voltage VIMAX = 100mV 85 100 115 mV VIMAX = 400mV 370 400 430 mV Input Bias 50 500 nA Power Limiting Section VSENSE Regulator Voltage IPL =64µA 4.35 4.85 5.35 V Duty Cycle Control IPL =64µA 0.6 1.2 1.7 % IPL = 1mA 0.045 0.1 0.17 % Overload Section Delay to Output Note 1 300 500 ns Output Sink Current VSENSE –VIMAX = 300mV 40 100 mA Threshold Relative to IMAX 140 200 260 mV Shutdown/Fault/Latch Section Shutdown Threshold 3 5 VDD+1 V Input Current VSDFLTCH = 5V 50 110 250 µA Filter Delay Time (Delay to Output) 250 500 1000 µs Fault Output High 6 9.5 V ISDFLTCH = –100µA 5 8.5 V Fault Output Low 010 mV Output Duty Cycle Fault Condition, IPL = 0 1.7 2.7 3.7 % ISDFLTCH = –100µA, Fault Condition, IPL =0 0 % Note 1: Guaranteed by design. Not 100% tested in production. PIN DESCRIPTIONS CT: A capacitor is connected to this pin in order to set the fault time. The fault time must be longer than the time to charge external load capacitance. The fault time is defined as: T C I FAULT T CH = • 2 where ICH =36 µA+IPL, and IPL is the current into the power limit pin. Once the maximum fault time is reached the output will shutdown for a time given by: TC SD T =• • 210$ IMAX: This pin programs the maximum allowable sourcing current. Since VDD is a regulated voltage, a voltage divider can be derived from VDD to generate the program level for IMAX. The current level at which the output appears as a current source is equal to the voltage on IMAX over the current sense resistor. If desired, a controlled current start up can be programmed with a capacitor on IMAX, and a programmed start delay can be achieved by driving the shutdown with an open collector/drain device into an RC network. OUT: This pin provides gate output drive to the MOSFET pass element. PL: This feature ensures that the average MOSFET power dissipation is controlled. A resistor is connected from this pin to the drain of the NMOS pass element. When the voltage across the NMOS exceeds 5V, current will flow into the PL pin which adds to the fault timer charge current, reducing the duty cycle from the 3% level. When IPL>>36 µA, then the average MOSFET power dissipation is given by: P avg IMAX R MOSFET PL =• • • − 110 $ |
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