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TL3844DG4 Arkusz danych(PDF) 5 Page - Texas Instruments |
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TL3844DG4 Arkusz danych(HTML) 5 Page - Texas Instruments |
5 / 21 page TL284x, TL384x CURRENT-MODE PWM CONTROLLERS SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 electrical characteristics over recommended operating free-air temperature range, VCC = 15 V (see Note 4), RT = 10 kΩ, CT = 3.3 nF (unless otherwise specified) reference section PARAMETER TEST CONDITIONS TL284x TL384x UNIT PARAMETER TEST CONDITIONS MIN TYP† MAX MIN TYP† MAX UNIT Output voltage IO = 1 mA, TA = 25°C 4.95 5 5.05 4.9 5 5.1 V Line regulation VCC = 12 V to 25 V 6 20 6 20 mV Load regulation IO = 1 mA to 20 mA 6 25 6 25 mV Temperature coefficient of output voltage 0.2 0.4 0.2 0.4 mV/ °C Output voltage with worst-case variation VCC = 12 V to 25 V, IO = 1 mA to 20 mA 4.9 5.1 4.82 5.18 V Output noise voltage f = 10 Hz to 10 kHz, TA = 25°C 50 50 µV Output-voltage long-term drift After 1000 h at TA = 25°C 5 25 5 25 mV Short-circuit output current −30 −100 −180 −30 −100 −180 mA † All typical values are at TA = 25°C. NOTE 4: Adjust VCC above the start threshold before setting it to 15 V. oscillator section PARAMETER TEST CONDITIONS TL284x TL384x UNIT PARAMETER TEST CONDITIONS MIN TYP† MAX MIN TYP† MAX UNIT Oscillator frequency (see Note 5) TA = 25°C 47 52 57 47 52 57 kHz Frequency change with supply voltage VCC = 12 V to 25 V 2 10 2 10 Hz/kHz Frequency change with temperature 50 50 Hz/kHz Peak-to-peak amplitude at RT/CT 1.7 1.7 V † All typical values are at TA = 25°C. NOTES: 4. Adjust VCC above the start threshold before setting it to 15 V. 5. Output frequency equals oscillator frequency for the TLx842 and TLx843. Output frequency is one-half the oscillator frequency for the TLx844 and TLx845. error-amplifier section PARAMETER TEST CONDITIONS TL284x TL384x UNIT PARAMETER TEST CONDITIONS MIN TYP† MAX MIN TYP† MAX UNIT Feedback input voltage COMP at 2.5 V 2.45 2.50 2.55 2.42 2.50 2.58 V Input bias current −0.3 −1 −0.3 −2 µA Open-loop voltage amplification VO = 2 V to 4 V 65 90 65 90 dB Gain-bandwidth product 0.7 1 0.7 1 MHz Supply-voltage rejection ratio VCC = 12 V to 25 V 60 70 60 70 dB Output sink current VFB at 2.7 V, COMP at 1.1 V 2 6 2 6 mA Output source current VFB at 2.3 V, COMP at 5 V −0.5 −0.8 −0.5 −0.8 mA High-level output voltage VFB at 2.3 V, RL = 15 kΩ to GND 5 6 5 6 V Low-level output voltage VFB at 2.7 V, RL = 15 kΩ to GND 0.7 1.1 0.7 1.1 V † All typical values are at TA = 25°C. NOTE 4: Adjust VCC above the start threshold before setting it to 15 V. |
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