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UCC3919DTRG4 Datasheet(PDF) 5 Page - Texas Instruments |
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UCC3919DTRG4 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 27 page UCC2919 UCC3919 SLUS374C − JULY 1999 − REVISED NOVEMBER 2005 5 www.ti.com electrical characteristics, VDD = 5 V, TA = 0°C to 70°C for the UCC3919, –40°C to 85°C for the UCC2919, all voltages are with respect to GND, TA = TJ, (unless otherwise specified) SD and L/R inputs PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input voltage low 0.8 V Input voltage high 2 V L/R input current 1 3 6 µA SD internal pulldown impedance 100 270 500 k Ω FLT output PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Output leakage current VDD = 5 V 10 µA Output low voltage IOUT = 10 mA 1 V FET gate driver and charge pump PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Peak output current VCAP = 15 V, VGATE = 10 V –3 –1 –0.25 mA Peak sink current VGATE = 5 V 20 mA Fault delay 100 300 ns Maximum output voltage VDD = 3 V, average IOUT = 1 µA 8 10 12 V Maximum output voltage VDD = 8 V, average IOUT = 1 µA 12 14 16 V Charge pump UVLO minimum voltage VDD = 3 V 6.5 8.8 10.1 V Charge pump UVLO minimum voltage to start VDD = 8 V 6.5 9.9 11.5 V Charge pump source impedance VDD = 5 V, average IOUT = 1 µA 50 100 150 k Ω pin descriptions CAP A capacitor is placed from this pin to ground to filter the output of the on board charge pump. A 0.01- µF to 0.1-µF capacitor will work in most applications. Refer to TI literature number SLUA339 application note, Sizing the UCC3919 Charge−Pump Capacitor, to determine the exact capacitance. CSN The negative current sense input signal. CSP The positive current sense input signal. Input to the duty cycle timer. CT Input to the duty cycle timer. A capacitor is connected from this pin to ground, setting the off time and maximum on time of the over-current protection circuit. FLT Fault indicator. This open drain output will pull low under any fault condition where the output driver is disabled. This output is disabled when the IC is in low current standby mode. |
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