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UC1842A Datasheet(PDF) 7 Page - Texas Instruments |
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UC1842A Datasheet(HTML) 7 Page - Texas Instruments |
7 / 31 page UC1842A-SP, UC1843A-SP, UC1844A-SP www.ti.com SLUS872D – JANUARY 2009 – REVISED MAY 2015 8.6 Electrical Characteristics (Radiation-Improved Devices) VCC = 15 V, RT = 10 kΩ, CT = 3.3 nF, TA = TJ = –55°C to 125°C (unless otherwise noted) (1) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT REFERENCE Output voltage TJ = 25°C, IO = 1 mA 4.94 5 5.06 V Line regulation VCC = 12 to 25 V 6 20 mV Load regulation IL = 1 to 20 mA 6 25 mV Total output variation Over line, load, and temperature 4.9 5.1 V Output noise voltage 10 Hz ≤ ƒ ≤ 10 kHz, TJ = 25°C 50 μV Short-circuit output current –30 –100 –180 mA OSCILLATOR Initial accuracy TJ = 25°C 47 52 57 kHz Voltage stability VCC = 12 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 AMPLIFIER Input voltage VComp = 2.5 V 2.45 2.50 2.55 V Input bias current –0.3 –1 μA Open-loop voltage gain VO = 2 to 4 V 65 90 dB Unity-gain bandwidth TJ = 25°C (3) 0.7 1 MHz PSRR VCC = 12 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 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 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 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 Start threshold 7.8 8.4 9 V Minimum operation voltage after turn-on 7 7.6 8.2 V (1) Electrical table applicable to radiation-improved 5962-8670409 device type (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 or 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 © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: UC1842A-SP UC1843A-SP UC1844A-SP |
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