Semiconductor Group

3

TDA 4814

The TDA 4814 A contains all functions for designing electronic ballasts and switched-mode power

supplies with sinusoidal line current consumption and a power factor approaching 1.

They control a boost converter as an active harmonic filter in a discontinuous (triangular shaped

current) mode with variable frequency.

The output voltage of this filter is regulated with high efficiency. Therefore the device can easily be

operated on different line voltages (110/220 V

The on-chip start/stop circuit monitors the lamp generator of electronic ballasts. It starts a self-

oscillating lamp generator and shuts it down in the event of malfunction, e.g. if the lamp is defective.

A typical application is in electronic ballasts, especially when a large number of such lamps are

concentrated on one line supply point.

Besides that a separate driver ground (GND QSIP) is implemented.

The TDA 4814 A in a P-DIP-14-1 package.

Block Diagram