L6382D5TR Ver la hoja de datos (PDF) - STMicroelectronics

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L6382D5TR

Power management unit for microcontrolled ballast

STMicroelectronics 

L6382D5

1

Device description

Device description

Designed in High-voltage BCD Off-line technology, the L6382D5 is provided with 4 inputs

pin and a high voltage start-up generator conceived for applications managed by a

microcontroller. 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 L6382D5 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 filaments in dimmable

applications.

A precise reference voltage (+5V ±2%) able to provide up to 30mA is available to supply the

µC in operating mode. Instead, during start-up and save mode the current available at VREF

is up to 10mA and it is provided by the internal high voltage start-up generator.

The chip has been conceived 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 L6382D5 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

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