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UC2843A-Q1 Datasheet(PDF) 3 Page - Texas Instruments |
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UC2843A-Q1 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 15 page ELECTRICAL CHARACTERISTICS UC2843A-Q1 www.ti.com........................................................................................................................................................................................................ SGLS384 – MAY 2008 TA = –40°C to 125°C, VCC = 15 V (1), R T = 10 kΩ, CT = 3.3 nF, TA = TJ (unless otherwise stated) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Reference Section Output voltage TJ = 25°C, IO = 1 mA 4.95 5.0 5.05 V Line regulation voltage VIN = 12 V to 25 V 6 20 mV Load regulation voltage IO = 1 mA to 20 mA 6 25 mV Temperature stability(2)(3) 0.2 0.4 mV/ °C Total output variation voltage Line, load, temperature 4.9 5.1 V Output noise voltage f = 10 Hz to 10 kHz TJ = 25°C 50 µV Long term stability 1000 hours TA = 125°C 5 25 mV Output short-circuit current –30 –100 –180 mA Oscillator Section Initial accuracy(4) TJ = 25°C 47 52 57 kHz Voltage stability VCC = 12 V to 25 V 0.2 1 % Temperature stability TA = MIN to MAX 5 % Amplitude peak-to-peak V pin 7 1.7 V TJ = 25°C 7.8 8.3 8.8 Discharge current(5) V pin 7 = 2 V mA TJ = Full range 7.5 8.8 Error Amplifier Section Input voltage COMP = 2.5 V 2.45 2.5 2.55 V Input bias current –0.3 –1 µA Open loop voltage gain (AVOL) VO = 2 V to 4 V 65 90 dB Unity gain bandwidth(3) TJ = 25°C 0.7 1 MHz PSRR VCC = 12 V to 25 V 60 70 dB Output sink current FB = 2.7 V, COMP = 1.1 V 2 6 mA Output source current FB = 2.3 V, COMP = 5 V –0.5 –0.8 mA VOUT high FB = 2.3 V, RL = 15 k Ω to GND 5 6 V VOUT low FB = 2.7 V, RL = 15 k Ω to VREF 0.7 1.1 V Current Sense Section Gain(6)(7) 2.85 3 3.15 V/V Maximum input signal(6) COMP = 5 V 0.9 1 1.1 V PSRR(6) VCC = 12 V to 25 V 70 dB Input bias current –2 –10 µA Delay to output(3) ISENSE = 0 V to 2 V 150 300 ns (1) Adjust VCC above the start threshold before setting at 15 V. (2) Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation: Temperature Stability = (VREF (max) – VREF (min))/(TJ (max) – TJ (min)). VREF (max) and VREF (min) are the maximum and minimum reference voltage measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature. (3) Specified by design. (4) Output frequency equals oscillator frequency for the UC2843A. (5) This parameter is measured with RT = 10 kΩ to VREF. This contributes approximately 300 µA of current to the measurement. The total current flowing into the RT/RC pin is approximately 300 µA higher than the measured value. (6) Parameter measured at trip point of latch with VFB at 0 V. (7) Gain is defined by: A = ΔVCOMP/ΔVSENSE; 0 ≤ VSENSE ≤ 0.8 V. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Link(s): UC2843A-Q1 |
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