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UC2825AQDWRQ1 Folha de dados(PDF) 5 Page - Texas Instruments |
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UC2825AQDWRQ1 Folha de dados(HTML) 5 Page - Texas Instruments |
5 / 14 page www.ti.com UC2825A-Q1 SLUS781 – SEPTEMBER 2007 ELECTRICAL CHARACTERISTICS (continued) TJ = –40°C to 125°C, RT = 3.65 kΩ, CT = 1 nF, VCC = 12 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT PWM Comparator IBIAS Bias current, RAMP VRAMP = 0 V –1 –8 μA Minimum duty cycle 0 % Maximum duty cycle 85 % tLEB Leading edge blanking time RLEB = 2 kΩ, CLEB = 470 pF 300 375 450 ns RLEB Leading edge blanking resistance VCLK/LEB = 3 V 8 10 12 k Ω VZDC Zero dc threshold voltage, EAOUT VRAMP = 0 V 1.10 1.25 1.4 V tDELAY Delay-to-output time(2) VEAOUT = 2.1 V, VILIM = 0 V to 2 V step 50 80 ns Current Limit / Start Sequence / Fault ISS Soft-start charge current VSS= 2.5 V 8 14 20 μA VSS Full soft-start threshold voltage 4.3 5 V IDSCH Restart discharge current VSS= 2.5 V 100 250 350 μA ISS Restart threshold voltage 0.3 0.5 V IBIAS ILIM bias current VILIM = 0 V to 2 V step 15 A ICL Current limit threshold voltage 0.95 1 1.05 V Overcurrent threshold voltage 1.14 1.2 1.26 td Delay-to-output time, ILIM(1) VILIM = 0 V to 2 V step 50 80 ns Output IOUT = 20 mA 0.25 0.4 Low-level output saturation voltage V IOUT = 200 mA 1.2 2.2 IOUT = –20 mA 1.9 2.9 High-level output saturation voltage V IOUT = –200 mA 2 3 tr, tf Rise/fall time(2) CL = 1 nF 20 45 ns Undervoltage Lockout (UVLO) Start threshold voltage 8.4 9.2 9.6 V UVLO hysteresis 0.4 0.8 1.2 V Supply Current Isu Startup current VC = VCC = VTH = –0.5 V 100 300 μA ICC Input current 28 36 mA (2) Specified by design Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 5 |
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