TEXAS INSTRUMENTS  UC3854N  PFC PRE-REGULATOR, 35V, DIP-16

TEXAS INSTRUMENTS UC3854N

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Product Overview


The UC3854N is a High Power Factor Preregulator that provides active power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. This device implements all the control functions necessary to build a power supply capable of optimally using available power-line current while minimizing line-current distortion. To do this, it contains a voltage amplifier, an analogue multiplier/divider, a current amplifier and a fixed-frequency PWM. In addition, the UC3854 contains a power MOSFET compatible gate driver, 7.5V reference, line anticipator, load-enable comparator, low-supply detector and over-current comparator. The UC3854 uses average current-mode control to accomplish fixed-frequency current control with stability and low distortion. Unlike peak current-mode, average current control accurately maintains sinusoidal line current without slope compensation and with minimal response to noise transients.
  • Control boost PWM to 0.99 power factor
  • Limit line current distortion to <5%
  • World-wide operation without switches
  • Feed-forward line regulation
  • Average current-mode control
  • Low noise sensitivity
  • Low start-up supply current
  • Fixed-frequency PWM drive
  • Low-offset analogue multiplier/divider
  • 1A Totem-pole gate driver
  • Precision voltage reference
  • Green product and no Sb/Br

Applications

Power Management
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Product Information


  • UVLO 16V
  • Supply Voltage Min 15V
  • Supply Voltage Max 35V
  • Startup Current 1.5mA
  • Operating Supply Current 10mA
  • Controller IC Case Style DIP
  • No. of Pins 16Pins
  • Duty Cycle (%) 95%
  • Frequency 200kHz
  • Operating Temperature Min 0°C
  • Operating Temperature Max 70°C
  • Packaging Each
  • MSL -
  • Supply Voltage Range 15V to 35V
  • SVHC No SVHC (15-Jun-2015)
  • Digital IC Case Style DIP

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      Newark Part No. Manufacturer Part No Manufacturer / Description
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    71J8481
    UC3854NG4

    UC3854NG4

    TEXAS INSTRUMENTS

    PFC PRE-REGULATOR, 35V, 16-DIP

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