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UCC3913N Datasheet(PDF) 4 Page - Texas Instruments |
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UCC3913N Datasheet(HTML) 4 Page - Texas Instruments |
4 / 21 page UCC2913 UCC3913 SLUS274A – JANUARY 1999 – REVISED APRIL 2003 4 www.ti.com TERMINAL FUNCTIONS TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION CT 4 I A capacitor is connected to this pin in order to set the maximum fault time. IMAX 2 I This pin programs the maximum allowable sourcing current. OUT 7 O Output drive to the MOSFET pass element. PL 8 I This feature ensures that the average MOSFET power dissipation is controlled. SENSE 6 I Input voltage from the current sense resistor. SD/FLT 1 O This pin provides fault output indication and shutdown control. VDD 3 O Current driven with a resistor to a voltage at least 10V more positive than VSS. VSS 5 O Ground reference for the device and the most negative voltage available. DETAILED PIN DESCRIPTIONS CT A capacitor connected to this pin allows setting of the maximum fault time. The maximum fault time must be more than the time to charge external load capacitance. The maximum fault time is defined as: t FAULT + 2 C T I CH where I CH + 36 mA ) IPL and IPL is the current into the power limit pin. Once the fault time is reached the output shuts down for a time given by: t SD + 2 106 C T 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 the IMAX pin. The current level at which the output appears as a current source is equal to the voltage on the IMAX pin over the current sense resistor. If desired, a controlled current startup can be programmed with a capacitor on the IMAX pin, and a programmed start delay can be achieved by driving the shutdown with an open collector/drain device into an R-C network. PL This pin’s feature ensures that the average MOSFET power dissipation is controlled. A resistor is connected from this pin to the drain of the N-channel MOSFET pass element. When the voltage across the N-channel MOSFET exceeds 5 V, current flows into the PL pin which adds to the fault timer charge current, reducing the duty cycle from the 3% level. When IPL is much greater 36 µA, then the average MOSFET power dissipation is given by: P FET(avg) + IMAX 1 10*6 R PL SENSE Input voltage from the current sense resistor. When there is greater than 50 mV across this pin with respect to VSS, a fault is sensed, and CT starts to charge. (1) (2) (3) (4) |
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