TK83854
TK83854 is HIGH POWER FACTOR PREREGULATOR manufactured by TOKO.
HIGH POWER FACTOR PREREGULATOR Features s s s s s s Control Boost PWM to 0.99 Power Factor Limit Line Current Distortion to < 5% Worldwide Operation without Switches Feed-Forward Line Regulation Low Noise Sensitivity Pin patible with UC2854, and UC3854 (Licensed Source)
Features
(CONT.) s s s s s Low Start-Up Supply Current Fixed-Frequency PWM Drive Low-Offset Analog Multiplier/Divider 1 Amp Totem-Pole Gate Driver Precision Voltage Reference
DESCRIPTION
The TK83854 family of integrated circuits provide active power factor correction for power systems that otherwise would draw non-sinusoidal current from sinusoidal power lines. These parts implement all the control functions necessary to build a power supply preregulator capable of optimally using available power-line current while minimizing line-current distortion. To do this, the TK83854 contains a voltage amplifier, a precision analog multiplier/ divider, a current amplifier, and a fixed-frequency PWM. In addition, the TK83854 contains a power MOSFET gate driver, 7.5 V reference, line anticipator, load-enable parator, low supply detector, and overcurrent parator. The TK83854 family uses average current-mode control to acplish fixed-frequency current control with stability and low distortion. Unlike peak current-mode control, average current control accurately maintains sinusoidal line current without slope pensation. The TK83854's high reference voltage and high oscillator amplitude minimize noise sensitivity while fast PWM elements permit chopping frequencies above 200 k Hz. The TK83854 can be used in systems with line voltages that vary from 75 to 275 V and with line frequencies across the 50 Hz to 400 Hz range. To reduce the burden on the
ENA circuitry that supplies power to this device, the TK83854 family Features low start-up supply current. These devices are available in 16-pin plastic dual in-line (DIP) and 16-pin surface mount (SOP) packages.
838 54
GND PKLMT CAOUT...
