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UC3843ADR2G Datasheet(PDF) 4 Page - ON Semiconductor |
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UC3843ADR2G Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 18 page UC3842A, UC3843A, UC2842A, UC2843A http://onsemi.com 4 ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 4], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh [Note 5], unless otherwise noted.) UC284XA UC384XA Characteristics Symbol Min Typ Max Min Typ Max Unit CURRENT SENSE SECTION Current Sense Input Voltage Gain (Notes 6 & 7) AV 2.85 3.0 3.15 2.85 3.0 3.15 V/V Maximum Current Sense Input Threshold (Note 6) Vth 0.9 1.0 1.1 0.9 1.0 1.1 V Power Supply Rejection Ratio VCC = 12 to 25 V (Note 6) PSRR − 70 − − 70 − dB Input Bias Current IIB − −2.0 −10 − −2.0 −10 mA Propagation Delay (Current Sense Input to Output) tPLH(in/out) − 150 300 − 150 300 ns OUTPUT SECTION Output Voltage Low State (ISink = 20 mA) Low State (ISink = 200 mA) High State (ISink = 20 mA) High State (ISink = 200 mA) VOL VOH − − 13 12 0.1 1.6 13.5 13.4 0.4 2.2 − − − − 13 12 0.1 1.6 13.5 13.4 0.4 2.2 − − V Output Voltage with UVLO Activated VCC = 6.0 V, ISink = 1.0 mA VOL(UVLO) − 0.1 1.1 − 0.1 1.1 V Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C) tr − 50 150 − 50 150 ns Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C) tf − 50 150 − 50 150 ns UNDERVOLTAGE LOCKOUT SECTION Startup Threshold UCX842A UCX843A Vth 15 7.8 16 8.4 17 9.0 14.5 7.8 16 8.4 17.5 9.0 V Minimum Operating Voltage After Turn−On UCX842A UCX843A VCC(min) 9.0 7.0 10 7.6 11 8.2 8.5 7.0 10 7.6 11.5 8.2 V PWM SECTION Duty Cycle Maximum Minimum DCmax DCmin 94 − 96 − − 0 94 − 96 − − 0 % TOTAL DEVICE Power Supply Current (Note 4) Startup: (VCC = 6.5 V for UCX843A, (VCC = 14 V for UCX842A) Operating ICC − − 0.5 12 1.0 17 − − 0.5 12 1.0 17 mA Power Supply Zener Voltage (ICC = 25 mA) VZ 30 36 − 30 36 − V 4. Adjust VCC above the Startup threshold before setting to 15 V. 5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Tlow =0°C for UC3842A, UC3843A Thigh = +70°C for UC3842A, UC3843A −25 °C for UC2842A, UC2843A +85 °C for UC2842A, UC2843A 6. This parameter is measured at the latch trip point with VFB = 0 V. 7. Comparator gain is defined as: AV DV Output Compensation DV Current Sense Input |
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