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UC1844A-SP Datasheet(PDF) 5 Page - Texas Instruments |
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UC1844A-SP Datasheet(HTML) 5 Page - Texas Instruments |
5 / 31 page UC1842A-SP, UC1843A-SP, UC1844A-SP www.ti.com SLUS872D – JANUARY 2009 – REVISED MAY 2015 8.5 Electrical Characteristics VCC = 15 V (1), R T = 10 kΩ, CT = 3.3 nF, TA = TJ = –55°C to 125°C (unless otherwise noted) (2) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT REFERENCE Output voltage TJ = 25°C, IO = 1 mA 4.95 5 5.06 V Line regulation VIN = 12 to 25 V 6 20 mV Load regulation IO = 1 to 20 mA 6 25 mV Temperature stability(3) (4) 0.2 0.4 mV/°C Total output variation(3) Over line, load, and temperature 4.9 5.1 V Output noise voltage 10 Hz ≤ ƒ ≤ 10 kHz, TJ = 25°C 50 μV Long-term stability 1000 hours, TA = 125°C (3) 5 25 mV Short-circuit output current –30 –100 –180 mA OSCILLATOR Initial accuracy TJ = 25°C (5) 47 52 57 kHz Voltage stability VCC = 12 to 25 V 0.2% 1% Temperature stability TA = MIN to MAX (3) 5% Amplitude peak-to-peak V pin 4(3) 1.7 V TJ = 25°C 7.8 8.3 8.8 Discharge current V pin 4 = 2 V(6) mA TJ = Full range 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(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 to 25 V (7) 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 13.5 V (1) Adjust VCC above the start threshold before setting at 15 V. (2) Electrical table applicable to 5962-8670405, 5962-8670406, and 5962-8670407 device types (3) Parameters ensured by design and/or characterization, if not production tested. (4) 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. (5) Output frequency equals oscillator frequency for the UC1842A and UC1843A. Output frequency is one-half oscillator frequency for UC1844A. (6) 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. (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. Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: UC1842A-SP UC1843A-SP UC1844A-SP |
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