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5962-8670405VXA Datasheet(PDF) 5 Page - Texas Instruments |
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5962-8670405VXA Datasheet(HTML) 5 Page - Texas Instruments |
5 / 15 page ELECTRICAL CHARACTERISTICS (RADIATION IMPROVED DEVICES) (1) UC1842A-SP, UC1843A-SP, UC1844A-SP, UC1845A-SP www.ti.com........................................................................................................................................................ SLUS872A – JANUARY 2009 – REVISED MAY 2009 VCC = 15 V, RT = 10 kΩ, CT = 3.3 nF, TA = TJ = –55°C to 125°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Reference Section Output voltage TJ = 25°C, IO = 1 mA 4.94 5 5.06 V Line regulation VCC = 12 V to 25 V 6 20 mV Load regulation IL = 1 mA to 20 mA 6 25 mV Total output variation Over line, load, and temperature 4.9 5.1 V Output noise voltage 10 Hz ≤ f ≤ 10 kHz, TJ = 25°C 50 µV Short-circuit output current –30 –100 –180 mA Oscillator Section Initial accuracy TJ = 25°C 47 52 57 kHz Voltage stability VCC = 12 V to 25 V 0.2 1 % Temperature stability TJ = -55°C to 125°C 5 % Amplitude VRT/CT peak to peak 1.7 V TJ = 25°C, VRT/CT = 2 V 7.8 8.3 8.8 Discharge current(2) mA VRT/CT = 2 V 7.5 8.8 Error Amp Section Input voltage VComp = 2.5 V 2.45 2.50 2.55 mV Input bias current –0.3 –1 µA Open-loop voltage gain VO = 2 V to 4 V 65 90 dB Unity-gain bandwidth TJ = 25°C (3) 0.7 1 MHz PSRR VCC = 12 V to 25 V 60 70 dB Output sink current VFB = 2.7 V, VComp = 1.1 V 2 6 mA Output source current VFB = 2.3 V, VComp = 5 V –0.5 –0.8 mA High-level output voltage VFB = 2.3 V, RL = 15 kΩ to ground 5 6 V Low-level output voltage VFB = 2.7 V, RL = 15 kΩ to VREF 0.7 1.1 V Current Sense Section Gain(4)(5) 2.85 3 3.15 V/V Maximum input signal VComp = 5 V (4) 0.9 1 1.1 V PSRR VCC = 12 V to 25 V (4) 70 dB Input bias current –2 –10 µA Delay to output VISENSE = 0 to 2 V (3) 150 300 ns Output Section ISINK = 20 mA 0.1 0.4 V Output low-level voltage ISINK = 200 mA 1.5 2.2 V ISOURCE = 20 mA 13 13.5 V Output high-level voltage ISOURCE = 200 mA 12 13.0 V Rise time CL = 1 nF, TJ = 25°C (3) 50 150 ns Fall time CL = 1 nF, TJ = 25°C (3) 50 150 ns UVLO saturation VCC = 5 V, ISINK = 10 mA 0.7 1.2 V Undervoltage Lockout Section Start threshold 7.8 8.4 9 V Minimum operation voltage after turn-on 7 7.6 8.2 V PWM Section (1) See Ordering Information (Radiation Improved Devices). (2) 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/CT pin will be approximately 300 µA higher than the measured value. (3) Parameters ensured by design and/or characterization, if not production tested. (4) Parameter measured at trip point of latch with VFB = 0 V. (5) Gain defined as: G = ΔVComp/ΔVISENSE; VISENSE = 0 to 0.8 V. Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): UC1842A-SP UC1843A-SP UC1844A-SP UC1845A-SP |
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