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TL284X_101 데이터시트(PDF) 1 Page - Texas Instruments |
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TL284X_101 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 21 page TL284x, TL384x CURRENT-MODE PWM CONTROLLERS SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Optimized for Off-Line and dc-to-dc Converters D Low Start-Up Current (<1 mA) D Automatic Feed-Forward Compensation D Pulse-by-Pulse Current Limiting D Enhanced Load-Response Characteristics D Undervoltage Lockout With Hysteresis D Double-Pulse Suppression D High-Current Totem-Pole Output D Internally Trimmed Bandgap Reference D 500-kHz Operation D Error Amplifier With Low Output Resistance D Designed to Be Interchangeable With UC2842 and UC3842 Series description/ordering information The TL284x and TL384x series of control integrated circuits provide the features that are necessary to implement off-line or dc-to-dc fixed-frequency current-mode control schemes, with a minimum number of external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state. Major differences between members of these series are the UVLO thresholds and maximum duty-cycle ranges. Typical UVLO thresholds of 16 V (on) and 10 V (off) on the TLx842 and TLx844 devices make them ideally suited to off-line applications. The corresponding typical thresholds for the TLx843 and TLx845 devices are 8.4 V (on) and 7.6 V (off). The TLx842 and TLx843 devices can operate to duty cycles approaching 100%. A duty-cycle range of 0 to 50% is obtained by the TLx844 and TLx845 by the addition of an internal toggle flip-flop, which blanks the output off every other clock cycle. The TL284x-series devices are characterized for operation from −40 °C to 85°C. The TL384x devices are characterized for operation from 0 °C to 70°C. Copyright 2008, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 1 2 3 4 5 6 7 14 13 12 11 10 9 8 COMP NC VFB NC ISENSE NC RT/CT REF NC VCC VC OUTPUT GND POWER GROUND D PACKAGE (TOP VIEW) 1 2 3 4 8 7 6 5 COMP VFB ISENSE RT/CT REF VCC OUTPUT GND D-8 OR P PACKAGE (TOP VIEW) NC − No internal connection |
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