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UC1825A-SP Folha de dados(PDF) 5 Page - Texas Instruments |
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UC1825A-SP Folha de dados(HTML) 5 Page - Texas Instruments |
5 / 16 page ELECTRICAL CHARACTERISTICS (Continued) UC1825A-SP www.ti.com ..................................................................................................................................................... SLUS873A – JANUARY 2009 – REVISED APRIL 2009 TA = –55°C to 125°C, RT = 3.65 kΩ, CT = 1 nF, VCC = 12 V, TA = TJ (unless otherwise noted) PARAMETER TEST CONDITIIONS 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 8.5 10.0 11.5 k Ω VZDC Zero dc threshold voltage, EAOUT VRAMP = 0 V 1.10 1.25 1.4 V tDELAY Delay-to-output time (1) VEAOUT = 5 V to 0 V step 50 120 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 0 V ≤ VILIM ≤ 1.5 V 15 µA 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 0.45 Low-level output saturation voltage IOUT = 200 mA 1.2 2.2 V IOUT = -20 mA 1.9 2.9 High-level output saturation voltage IOUT = -200 mA 2 3 tr, tf Rise/fall time(1) CL = 1 nF 20 45 ns UNDERVOLTAGE LOCKOUT (UVLO) Start threshold voltage 8.3 9.2 9.6 V UVLO hysteresis 0.4 0.8 1.25 SUPPLY CURRENT Isu Startup current VC = VCC = 8 V 100 300 µA ICC Input current 28 36 mA (1) Parameters ensured by design and/or characterization, if not production tested. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): UC1825A-SP |
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