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5962-8670407VXA Datasheet(PDF) 4 Page - Texas Instruments |
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5962-8670407VXA Datasheet(HTML) 4 Page - Texas Instruments |
4 / 15 page UC1842A-SP, UC1843A-SP, UC1844A-SP, UC1845A-SP SLUS872A – JANUARY 2009 – REVISED MAY 2009........................................................................................................................................................ www.ti.com ELECTRICAL CHARACTERISTICS (continued) 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 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 (6) 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(7)(8) 2.85 3 3.15 V/V Maximum input signal VComp = 5 V (7) 0.9 1 1.1 V PSRR VCC = 12 V to 25 V (7) 70 dB Input bias current –2 –10 µA Delay to output VISENSE = 0 to 2 V (6) 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 13.5 V Rise time CL = 1 nF, TJ = 25°C (6) 50 150 ns Fall time CL = 1 nF, TJ = 25°C (6) 50 150 ns UVLO saturation VCC = 5 V, ISINK = 10 mA 0.7 1.2 V Undervoltage Lockout Section UC1842A, UC1844A 15 16 17 Start threshold V UC1843A, UC1845A 7.8 8.4 9 UC1842A, UC1844A 9 10 11 Minimum operation voltage after turn-on V UC1843A, UC1845A 7 7.6 8.2 PWM Section UC1842A, UC1843A 94 96 100 Maximum duty cycle % UC1844A, UC1845A 47 48 50 Minimum duty cycle 0 % Total Standby Current Start-up current 0.3 0.5 mA Operating supply current VFB = VISENSE = 0 V 11 17 mA VCC zener voltage ICC = 25 mA 30 34 V (6) Parameters ensured by design and/or characterization, if not production tested. (7) Parameter measured at trip point of latch with VFB = 0 V. (8) Gain defined as: G = ΔVComp/ΔVISENSE; VISENSE = 0 to 0.8 V. 4 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): UC1842A-SP UC1843A-SP UC1844A-SP UC1845A-SP |
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