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UC2823BNG4 Datasheet(PDF) 5 Page - Texas Instruments |
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UC2823BNG4 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 19 page UC1823A, UC2823A, UC2823B, UC3823A, UC3823B, UC1825A, UC2825A, UC2825B, UC3825A, UC3825B SLUS334E − AUGUST 1995 − REVISED SEPTEMBER 2010 www.ti.com 5 ELECTRICAL CHARACTERISTICS TA = −55°C to 125°C for the UC1823A/UC1825A, TA = −40°C to 85°C for the UC2823x/UC2825x, TA = 0°C to 70°C for the UC3823x/UC3825x, RT = 3.65 kΩ, CT = 1 nF, VCC = 12 V, TA = TJ (unless otherwise noted) 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 kΩ VZDC Zero dc threshold voltage, EAOUT VRAMP = 0 V 1.10 1.25 1.4 V tDELAY Delay-to-output time(1) 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 μA ICL Current limit threshold voltage 0.95 1 1.05 V Overcurrent threshold voltage 1.14 1.2 1.26 V td Delay-to-output time, ILIM(1) VILIM = 0 V to 2 V step 50 80 ns OUTPUT Low level output saturation voltage IOUT = 20 mA 0.25 0.4 Low-level output saturation voltage IOUT = 200 mA 1.2 2.2 V High level output saturation voltage IOUT = 20 mA 1.9 2.9 V 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) UC2823B, UC2825B, UC3825B, UC3825B 16 17 Start threshold voltage UC1823A, UC1825A, UC2823A, UC2825A UC3825A, UC3825A 8.4 9.2 9.6 Stop threshold voltage UC2823B, UC2825B, UC3825B, UC3825B 9 10 V OVLO hysteresis UC1823A, UC1825A, UC2823A, UC2825A UC3825A, UC3825A 0.4 0.8 1.2 V OVLO hysteresis UC2823B, UC2825B, UC3825B, UC3825B 5 6 7 SUPPLY CURRENT Isu Startup current VC = VCC = VTH(start) − 0.5 V 100 300 μA ICC Input current 28 36 mA (1) Ensured by design. Not production tested. |
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