Description

The TDA 4862 is excellent convenient for designing a preconverter in ballasts and switched mode power supplies with sinusoidal line current consumption and a power factor approaching unity.

The TDA 4862 controls a boost converter as an active harmonics filter in a discontinuous mode (free oscillating triangular shaped current mode).

The TDA 4862 comprises an internal start-up timer, a high gain voltage amplifier, an one quadrant multiplier for approaching unity power factor, a zero current detector, PWM and logic circuitry, and totem pole MOSFET gate driver.

Protective features are: input undervoltage lockout with hysteresis, VCC zener clamp, cycle-by-cycle current limiting, output voltage limiting for fast and slow load changes up to open circuit, and a sinking gate driver current activated whenever undervoltage mode occurs.

The output voltage of this preconverter is regulated with high accuracy. Therefore the device can be used for world-wide line voltages without switches.

The TDA 4862 is the improved version of the TDA 4817 with a pinout equivalent to world standard.

Features

• IC for sinusoidal line-current consumption

• Power factor approaching 1

• Controls boost converter as an active harmonics filter

• Internal start-up with low current consumption

• Zero current detector for discontinuous operation mode

• High current totem pole gate driver

• Trimmed ± 1.4 internal reference

• Undervoltage lock-out with hysteresis

• Very low start-up current consumption

• Pin compatible to world standard

• Fast overvoltage regulator

• Current sense input with internal low pass filter