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UC2845AD8G4 Datasheet(PDF) 6 Page - Texas Instruments |
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UC2845AD8G4 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 45 page 6 UC1842A, UC1843A, UC1844A, UC1845A UC2842A, UC2843A, UC2844A, UC2845A UC3842A, UC3843A, UC3844A, UC3845A SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016 www.ti.com Product Folder Links: UC1842A UC1843A UC1844A UC1845A UC2842A UC2843A UC2844A UC2845A UC3842A UC3843A UC3844A UC3845A Submit Documentation Feedback Copyright © 1994–2016, Texas Instruments Incorporated (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. 7.4 Thermal Information THERMAL METRIC(1) UC184xA UC2843A UC284xA, UC384xA UNIT JG (CDIP) FK (LCCC) FN (PLCC) P (PDIP) D (SOIC) D (SOIC) DW (SOIC) 8 PINS 20 PINS 20 PINS 8 PINS 8 PINS 14 PINS 16 PINS RθJA Junction-to-ambient thermal resistance — — 56.7 53.4 104.3 77.9 73.6 °C/W RθJC(top) Junction-to-case (top) thermal resistance 64 36.2 34.6 46.4 46.8 35.8 35 °C/W RθJB Junction-to-board thermal resistance 92.5 35.4 21.8 30.7 45.3 32.5 38.4 °C/W ψJT Junction-to-top characterization parameter — — 10.4 16.8 6 6.6 9.7 °C/W ψJB Junction-to-board characterization parameter — — 21.5 30.6 44.6 32.2 37.8 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance 15.1 4.1 — — — — — °C/W (1) Adjust VCC above the start threshold before setting at 15 V. (2) Ensured by design, but not 100% production tested. (3) Temperature stability, sometimes referred to as average temperature coefficient, is described by: 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. (4) Output frequency equals oscillator frequency for the UC1842A and UC1843A. Output frequency is one half oscillator frequency for the UC1844A and UC1845A. (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/CT pin is approximately 300 µA higher than the measured value. 7.5 Electrical Characteristics Unless otherwise stated, these specifications apply for TA = –55°C to 125°C (UC184xA), TA = –40°C to 125°C (UC284xAQ), TA = –40°C to 85°C (UC284xA), TA = 0°C to 70°C (UC384xA); TA = TJ; VCC = 15 V (1); R T = 10 kΩ; CT = 3.3 nF. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT REFERENCE Output voltage TJ = 25°C, IO = 1 mA UC184xA, UC284xA 4.95 5 5.05 V UC384xA 4.9 5 5.1 Line regulation 12 ≤ VIN ≤ 25 V 6 20 mV Load regulation 1 ≤ IO ≤ 20 mA 6 25 mV Temperature stability See (2)(3) 0.2 0.4 mV/°C Total output variation Line, Load, Temperature UC184xA, UC284xA 4.9 5.1 V UC384xA 4.82 5.18 Output noise voltage 10 Hz ≤ f ≤ 10 kHz; TJ = 25°C (2) 50 µV Long-term stability TA = 125°C, 1000 hrs (2) 5 25 mV Output short circuit –30 –100 –180 mA OSCILLATOR Initial accuracy TJ = 25°C (4) 47 52 57 kHz Voltage stability 12 ≤ VCC ≤ 25 V 0.2% 1% Temperature stability TMIN ≤ TA ≤ TMAX (2) 5% Amplitude VRT/CT peak to peak (2) 1.7 V Discharge current TJ = 25°C, VRT/CT = 2 V (5) 7.8 8.3 8.8 mA VRT/CT = 2 V (5) UC184xA, UC284xA 7.5 8.8 UC384xA 7.6 8.8 |
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