AN2640 datasheet(18/36 Pages) STMICROELECTRONICS

18 / 36 page

L6382D5 - power management units for microcontrolled ballast

AN2640

18/36

L6382D5 - power management units for

microcontrolled ballast

4.1

Introduction

This driver allows powering efficiently all the ICs (PFC, microcontroller, driver) in all

conditions and allows the microcontroller to drive the MOSFET (both half-bridge and PFC)

without using numerous different drivers.

Figure 20.

L6385Dx block diagram

The L6382D5 ICs (Figure 20) include 3 MOSFET driving stages (for PFC, for the half-

bridge, for the preheating MOSFET) plus a power management unit (PMU) able to supply

the microcontroller in any condition by means of a voltage reference available at a pin. It has

a precise reference voltage (5VDC ±2%, overall temperature range) able to provide up to

30 mA to supply the microcontroller.

The L6382D5 also integrates a function that regulates the IC supply voltage without the

need of any external charge pump and optimizes the current consumption (Figure 21). The

L6382D5 reduces the application bill of materials because many different tasks (regarding

drivers and power management) are performed by a single IC, which of course improves

application reliability.

AN2640 Datasheet(PDF) 18 Page - STMicroelectronics