TL3844P Electronics Components , Current - Mode Pwm Controllers Digital Ic Circuits

TL284x, TL384x CURRENT-MODE PWM CONTROLLERS

►Optimized for Off-Line and dc-to-dc Converters

►Low Start-Up Current (<1 mA)

►Automatic Feed-Forward Compensation

►Pulse-by-Pulse Current Limiting

►Enhanced Load-Response Characteristics

►Undervoltage Lockout With Hysteresis

►Double-Pulse Suppression

►High-Current Totem-Pole Output

►Internally Trimmed Bandgap Reference

►500-kHz Operation

►Error Amplifier With Low Output Resistance

►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-series devices are characterized for operation from 0°C to 70°C.

functional block diagram

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