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UC2844AQD Arkusz danych(PDF) 5 Page - Texas Instruments |
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UC2844AQD Arkusz danych(HTML) 5 Page - Texas Instruments |
5 / 19 page UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ CURRENT-MODE PWM CONTROLLER SGLS164 – APRIL 2003 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics, TA = –40_C to 125_C, VCC = 15 V (see Note 1), RT = 10 kΩ, CT = 3.3 nF, and TA = TJ (unless otherwise stated) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Error Amplifier Section Input voltage COMP = 2.5 V 2.45 2.5 2.55 V Input bias current –0.3 –1 µA Open loop voltage gain (AVOL) VO = 2 V to 4 V 65 90 dB Unity gain bandwidth See Note 2 TJ = 25_C 0.7 1 MHz PSRR VCC = 12 V to 25 V 60 70 dB Output sink current FB = 2.7 V, COMP = 1.1 V 2 6 mA Output source current FB = 2.3 V, COMP = 5 V –0.5 –0.8 mA VOUT high FB = 2.3 V, RL = 15 kΩ to GND 5 6 V VOUT low FB = 2.7 V, RL = 15 kΩ to VREF 0.7 1.1 V Current Sense Section Gain See Notes 6 and 7 2.85 3 3.15 V/V Maximum input signal COMP = 5 V, See Note 6 0.9 1 1.1 V PSRR VCC = 12 V to 25 V,See Note 6 70 dB Input bias current –2 –10 µA Delay to output ISENSE = 0 V to 2 V, See Note 2 150 300 ns Output Section (OUT) Low level output voltage IOUT = 20 mA 0.1 0.4 V Low-level output voltage IOUT = 200 mA 15 2.2 V High level output voltage IOUT = –20 mA 13 13.5 V High-level output voltage IOUT = –200 mA 12 13.5 V Rise time CL = 1 nF, See Note 2 TJ = 25_C 50 150 ns Fall time CL = 1 nF, See Note 2 TJ = 25_C 50 150 ns UVLO saturation VCC = 5 V, IOUT = 10 mA 0.7 1.2 V Undervoltage Lockout Section Start threshold UC2842A, UC2844A 15 16 17 V Start threshold UC2843A, UC2845A 7.8 8.4 9 V Minimum operation voltage after turn on UC2842A, UC2844A 9 10 11 V Minimum operation voltage after turn on UC2843A, UC2845A 7 7.6 8.2 V |
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