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UCC39421PW Datasheet(PDF) 4 Page - Texas Instruments |
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UCC39421PW Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 39 page  UCC29421, UCC29422, UCC39421, UCC39422 MULTIMODE HIGHFREQUENCY PWM CONTROLLER SLUS246C − OCTOBER 1999 − REVISED FEBRUARY 2005 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating free-air temperature range, TA = −40°C to 85 °C for the UCC2942x, 0°C to 70°C for the UCC3942x, RT = 100 kΩ, VVPUMP = 6 V, VVIN = 3 V. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Current Sense Section Gain 8 10 11 V/V Overcurrent limit threshold 120 150 190 mV Unity gain bandwidth See Note 1 25 MHz COMP voltage to ISENSE accuracy ISENSE = 70 mV 0.83 1.00 1.23 V PWM Section Maximum duty cycle VISENSE = 0 V, VFB = 0 V 80 88 % Minimum duty cycle VFB = 1.5 V 0 % Low power mode VCOMP threshold At COMP pin 0.53 0.60 0.67 V Slope compensation accuracy RT = 350 kΩ, RSLOPE = 20 kΩ 1.4 2.8 4.0 A/s Rectifier zero current threshold RSEL = GND –2 15 30 mV Rectifier zero current threshold RSEL = VIN –28 –15 2 mV RSEL threshold 0.5 0.9 1.3 V PFM Section PFM disable threshold 0.17 0.22 0.27 V Comp hold during sleep VPFM = 0.4 V 0.40 0.47 0.65 V Startup delay after sleep VFB < 1.23 V 4 9 µs FB voltage to sleep off 1.185 1.220 1.245 V VGSW Drive Section Rise time CO = 1 nF 18 35 ns Fall time CO = 1 nF 14 30 ns Output high IOUT = –100 mA, Respect to VPUMP 0.4 0.65 V Output high IOUT = –1 mA, Respect to VPUMP 4 10 mV Output low IOUT = 100 mA 0.2 0.35 V Output low IOUT = 1 mA 2 6 mV Charge off to rectifier on delay 10 40 65 ns RECT Drive Section Rise time CO = 1 nF 20 40 ns Fall time CO = 1 nF 14 30 ns Output high IOUT = –100 mA, Respect to VPUMP 0.2 0.5 V Output high IOUT = –1 mA, Respect to VPUMP 5 10 mV Output low rectifier IOUT = 100 mA 0.2 0.35 V Output low rectifier IOUT = 1 mA 2 6 mV Rectifier off to charge on delay 10 40 65 ns RESET Section (UCC39422 Only) Reset timeout CRSADJ = 0.33 µF 100 250 400 ms Reset threshold Percentage below regulation voltage –7 –5.5 –4 % Output low voltage Reset condition, I = 5 mA 0.1 0.25 V Output leakage RESET = 8 V 0.05 0.2 µA NOTE 1: Ensured by design. Not production tested. |
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Similar Description - UCC39421PW |
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