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TPS40051 Datasheet(PDF) 3 Page - Texas Instruments |
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TPS40051 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 30 page TPS40050 TPS40051 TPS40053 SLUS540F − DECEMBER 2002 − REVISED JUNE 2004 www.ti.com 3 ELECTRICAL CHARACTERISTICS TA = −40°C to 85°C, VIN = 24 Vdc, RT = 90.9 kΩ, IKFF = 150 µA, fSW = 500 kHz, all parameters at zero power dissipation (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT SUPPLY VIN Input voltage range, VIN 8 40 V OPERATING CURRENT IDD Quiescent current Output drivers not switching, VFB ≥ 0.75 V 1.5 3.0 mA BP5 VBP5 Output voltage IOUT ≤ 1 mA 4.7 5.0 5.2 V OSCILLATOR/RAMP GENERATOR(2) fOSC Accuracy 8 V ≤ VIN ≤ 40 V 470 500 570 kHz VRAMP PWM ramp voltage(1) VPEAK−VVAL 2.0 V VIH High-level input voltage, SYNC 2 5 V VIL Low-level input voltage, SYNC 0.8 V ISYNC Input current, SYNC 5 10 µA Pulse width, SYNC 50 ns VRT RT voltage 2.38 2.50 2.58 V Maximum duty cycle VFB = 0 V, fSW ≤ 500 kHz 85% 94% Maximum duty cycle VFB = 0 V, 500 kHz ≤ fSW ≤ 1 MHz 80% Minumum duty cycle VFB ≥ 0.75 V 0% VKFF Feed-forward voltage 3.35 3.48 3.65 V IKFF Feed-forward current operating range(1) 20 1100 µA SOFT START ISS Soft-start source current 1.75 2.35 2.85 µA VSS Soft-start clamp voltage 3.7 V tDSCH Discharge time CSS = 220 pF 1.6 2.2 2.8 s tSS Soft-start time CSS = 220 pF, 0 V ≤ VSS ≤ 1.6 V 115 155 205 µs BP10 VBP10 Ouput voltage IOUT ≤ 1 mA 9.0 9.6 10.3 V ERROR AMPLIFIER 8 V ≤ VIN ≤ 40 V, TA = 25°C 0.698 0.700 0.704 VFB Feedback input voltage 8 V ≤ VIN ≤ 40 V, 0 °C ≤ TA ≤ 85°C 0.690 0.700 0.707 V VFB Feedback input voltage 8 V ≤ VIN ≤ 40 V, −40 °C ≤ TA ≤ 85°C 0.690 0.700 0.715 V GBW Gain bandwidth 3.0 5.0 MHz AVOL Open loop gain 60 80 dB IOH High-level output source current 2.0 4.0 mA IOL Low-level output sink current 2.5 4.0 mA VOH High-level output voltage ISOURCE = 500 µA 3.2 3.5 V VOL Low-level output voltage ISINK = 500 µA 0.20 0.35 V IBIAS Input bias current VFB = 0.7 V 100 200 nA (1) Ensured by design. Not production tested. (2) IKFF increases with SYNC frequency, IKFF decreases with maximum duty cycle |
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