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UC1854BL Arkusz danych(PDF) 5 Page - Texas Instruments |
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UC1854BL Arkusz danych(HTML) 5 Page - Texas Instruments |
5 / 18 page www.ti.com ELECTRICAL CHARACTERISTICS (Continued) (2) Gain constant. ( ) ( ) ( )2 1 5 IAC VAO VRMS MOUT I V . V K V I ´ - = é ù ´ ë û UC1854A UC2854A, UC2854B UC3854A, UC3854B SLUS329E – MONTH 2003 – REVISED JANUARY 2008 VCC = 18 V, RT = 8.2 kΩ, CT = 1.5 nF, VPKLMT = 1 V, VVRMS = 1.5 V, IIAC = 100 µA, IISENSE = 0 V, VCAO = 3.5 V, VVAO = 5 V, VVSENSE = 3 V, –40°C < TA < 85°C for the UC2854A and UC2854B, and 0°C < TA < 70°C for the UC3854A and UC3854B, and TA = TJ (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OSCILLATOR Initial accuracy TA = 25°C 85 100 115 kHz Voltage stability 12 V ≤ VCC ≤ 18 V 1% Total variation Line, temperature 80 120 kHz Ramp amplitude (peak-to-peak) 4.9 5.9 V Ramp valley voltage 0.8 1.3 V ENABLE/SOFT-START/CURRENT LIMIT Enable threshold voltage 2.35 2.55 2.80 V Enaable hysteresis VFAULT = 2.5 V 500 600 mV Enable input bias current VENA = 0 V –2 –5 µA Propagation delay to disable time(1) Enable overdrive = 100 mV 300 ns Soft-start charge current VSS = 2.5 V 10 14 24 µA Peak limit offset voltage –15 15 mV Peak limit offset current VPKLMIT = –0.1 V –200 –100 µA Peak limit propagation delay time(1) 150 ns MULTIPLIER IAC = 100 µA, VRMS = 1 V, Output current, IA limited –220 –200 –170 µA RSET = 10 kΩ Output current, zero IAC = 0 µA, RSET = 10 kΩ –2.0 –0.2 2.0 µA Output current, power limited VRMS = 1.5 V Va = 6 V –230 –200 –170 µA VRMS = 1.5 V Va = 2 V –22 VRMS = 1.5 V Va = 5 V –156 Output current µA VRMS = 5 V Va = 2 V –2 VRMS = 5 V Va = 5 V –14 Gain constant(2) VRMS = 1.5 V Va = 6 V, TA = 25°C –1.1 –1.0 –0.9 A/A GATE DRIVER VOH High-level output voltage IOUT = –200 mA, VCC = 15 V 12.0 12.8 V VOL Low-level output voltage IOUT = 200 mA 1.0 2.2 V IOUT = 10 mA 300 500 mV Low-level UVLO voltage IOUT = 50 mA, VCC = 0 V 0.9 1.5 V Output rise time(1) CLOAD = 1 nF 35 ns Output fall time(1) CLOAD = 1 nF 35 ns Output peak current(1) CLOAD = 10 nF 1.0 A (1) Ensured by design. Not production tested. Copyright © 2003–2008, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): UC1854A UC2854A, UC2854B UC3854A, UC3854B |
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