L6382D

Device description

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Device description

Designed in High-voltage BCD Off-line technology, the L6382D is a PFC and ballast

controller provided with 4 inputs pin and a high voltage start-up generator conceived for

applications managed by a microcontroller providing the maximum flexibility. It allows the

designer to use the same ballast circuit for different lamp wattage/type by simply changing

the

µC software.

The digital input pins - able to receive signals up to 400KHz - are connected to level shifters

that provide the control signals to their relevant drivers; in particular the L6382D embeds

one driver for the PFC pre-regulator stage, two drivers for the ballast half-bridge stage (High

Voltage, including also the bootstrap function) and the last one to provide supplementary

features like preheating of filaments supplied through isolated windings in dimmable

applications.

A precise reference voltage (+3.3V ±1%) able to provide up to 30mA is available to supply

the

µC: this current is obtained thanks to the on-chip high voltage start-up generator that,

moreover, keeps the consumption before start-up below 150

µA.

The chip has been designed with advanced power management logic to minimize power

losses and increase the application reliability.

In the half-bridge section, a patented integrated bootstrap section replaces the external

bootstrap diode.

The L6382D integrates also a function that regulates the IC supply voltage (without the need

of any external charge pump) and optimizes the current consumption.

Figure 2.

Typical system block diagram