L6382D データシートの表示（PDF） - STMicroelectronics

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L6382D

Power management unit for LED drivers

STMicroelectronics 

L6382D

1

Device description

Device description

Designed in high voltage BCD off-line technology, the L6382D is a PFC and a half-bridge

stage LED drivers controller equipped with 4 input pins and a high voltage startup generator

conceived for applications managed by a microcontroller, providing maximum flexibility. It

allows the designer to use the same LED drivers circuit for different lamp wattages/types

simply by changing the mC software.

The digital input pins - capable of receiving signals up to 400 KHz - 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 LED drivers half-

bridge stage (high voltage, and also including the bootstrap function) and the last one to

provide supplementary features.

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

the mC: this current is obtained thanks to the on-chip high voltage startup generator which,

moreover, keeps the consumption before startup below 150 A.

The chip was designed with advanced power management logic to minimize power losses

and increase application reliability.

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

bootstrap diode.

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

for an external charge pump) and optimizes the current consumption.

Figure 2. Typical system block diagram

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