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UC3842AD8 датащи(PDF) 7 Page - Texas Instruments |
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UC3842AD8 датащи(HTML) 7 Page - Texas Instruments |
7 / 45 page 7 UC1842A, UC1843A, UC1844A, UC1845A UC2842A, UC2843A, UC2844A, UC2845A UC3842A, UC3843A, UC3844A, UC3845A www.ti.com SLUS224E – SEPTEMBER 1994 – REVISED JULY 2016 Product Folder Links: UC1842A UC1843A UC1844A UC1845A UC2842A UC2843A UC2844A UC2845A UC3842A UC3843A UC3844A UC3845A Submit Documentation Feedback Copyright © 1994–2016, Texas Instruments Incorporated Electrical Characteristics (continued) 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 (6) Parameter measured at trip point of latch with VFB = 0. (7) Gain defined as: A = ΔVCOMP / ΔVISENSE; 0 ≤ VISENSE ≤ 0.8 V. ERROR AMPLIFIER Input voltage VCOMP = 2.5 V UC184xA, UC284xA 2.45 2.5 2.55 V UC384xA 2.42 2.5 2.58 Input bias current –0.3 –1 µA –0.3 –2 AVOL Open-loop gain 2 ≤ VO ≤ 4 V 65 90 dB Unity gain bandwidth TJ = 25°C (2) 0.7 1 MHz CMRR Common mode rejection ratio 12 ≤ VCC ≤ 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 VOUT high VFB = 2.3 V, RL = 15 kΩ to ground 5 6 V VOUT low VFB = 2.7 V, RL = 15 kΩ to VREF 0.7 1.1 V CURRENT SENSE Gain See (6)(7) 2.85 3 3.15 V/V Maximum input signal VCOMP = 5 V (6) 0.9 1 1.1 V PSRR Power supply rejection ratio 12 ≤ VCC 25 V (6) 70 dB Input bias current –2 –10 µA Delay to output VISENSE = 0 to 2 V (2) 150 300 ns OUTPUT Output low level ISINK = 20 mA 0.1 0.4 V ISINK = 200 mA 15 2.2 Output high level ISOURCE = 20 mA 13 13.5 V ISOURCE = 200 mA 12 13.5 Rise time TJ = 25°C, CL = 1 nF (2) 50 150 ns Fall time TJ = 25°C, CL = 1 nF (2) 50 150 ns UVLO saturation VCC = 5 V, ISINK = 10 mA 0.7 1.2 V UNDERVOLTAGE LOCKOUT Start threshold UC1842A, UC1844A, UC2842A, and UC2844A 15 16 17 V UC3842A and UC3844A 14.5 16 17.5 UCx843A and UCx845A 7.8 8.4 9 Minimum operation voltage after turnon UC1842A, UC1844A, UC2842A, and UC2844A 9 10 11 V UC3842A and UC3844A 8.5 10 11.5 UCx843A and UCx845A 7 7.6 8.2 PWM Maximum duty cycle UCx842A, UCx843A 94% 96% 100% UCx844A, UCx845A 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 |
Аналогичный номер детали - UC3842AD8 |
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Аналогичное описание - UC3842AD8 |
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