STMicroelectronics L6382D5TR

Overview

L6382D5 from STMicroelectronics is a high-voltage BCD-based power management unit (PMU) for microcontroller-controlled electronic ballasts with integrated PFC and half-bridge stages. It integrates four MOSFET drivers (PFC, half-bridge high/low-side, preheating), 5V ±2% reference (30mA max), internal bootstrap diode, two-point VCC regulator, and digital over-current protection with CSO latched output. Used in dimmable/non-dimmable fluorescent lamp ballasts.

For engineers reviewing the L6382D5 datasheet, L6382D5 pinout, L6382D5 application, or L6382D5 equivalent, this IC delivers integrated gate driving, power sequencing, and microcontroller supply regulation - critical for compact, reliable, software-configurable ballast designs operating across lamp wattage variants.

Technical Context

The L6382D5 implements a state-machine–driven power management architecture with three operational modes: START-UP (HV start-up generator active, VREF disabled), SAVE MODE (VREF sourcing ≤10mA, HVSU cycling to maintain VCC between 12.75–14.85V), and OPERATING MODE (VREF sourcing up to 30mA, TPR regulating VCC, OCP enabled, all drivers active). Transitions are governed by VCC thresholds, VREF voltage, and LGI/HGI timing.

Its driver subsystem includes level-shifted 5V-compatible inputs (PFI, LSI, HSI, HEI), totem-pole outputs with defined sink/source capability (e.g., PFG: 120mA source / 250mA sink), patented synchronous bootstrap diode (R_DS(on) = 150Ω), and interlocking logic preventing cross-conduction. The TPR block enables charge-pump–free VCC regulation using external switching node coupling.

Key Specifications

Pinout & Package

Package: SO-20 (Small Outline, 20-pin, 0.65 mm pitch, body width 7.5 mm), surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power management unit applications.

Compared with IRS2153D and L6574, the L6382D5 uniquely combines microcontroller compatibility, integrated 5V supply, four-channel gate driving, and programmable power-state management - enabling single-IC, software-defined ballast platforms with reduced validation effort and faster time-to-market.

Availability

L6382D5 is available at Aetrix Electronics and suitable for fluorescent lamp ballasts, industrial lighting control systems, and energy-efficient lighting modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6382D5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader specializing in power management, analog, and microcontroller solutions for industrial, automotive, and consumer applications.

The L6382D5 belongs to ST's dedicated lighting control IC portfolio, designed specifically for microcontroller-driven electronic ballasts with integrated PFC, half-bridge, and filament preheating functions.

FAQ

What is the maximum allowable voltage on the HVSU pin?

The HVSU pin supports an absolute maximum voltage of 600 V, enabling direct connection to rectified AC mains without external voltage division. This rating is validated per ST's BCD process specifications and includes safety margin for transient surges up to 600 V peak. Operation above this voltage risks permanent damage to the internal 600 V start-up MOSFET.

How does the L6382D5 implement cross-conduction protection?

The L6382D5 uses hardware-level interlocking logic that monitors LSI and HSI inputs in real time: if both signals are high simultaneously, the internal logic forces LSG and HSG outputs low with zero propagation delay. This prevents shoot-through by ensuring mandatory dead-time, independent of µC firmware timing accuracy or external gate resistors.

Can the VREF pin supply a 5V microcontroller during all operating modes?

VREF supplies the microcontroller only in SAVE and OPERATING modes: up to 10 mA in SAVE mode and up to 30 mA in OPERATING mode. During START-UP, VREF is actively clamped below 1.8 V by an internal sinking circuit to prevent premature µC wake-up; it becomes active only after VCC exceeds 14 V and the device enters SAVE mode.

What is the function of the TPR pin and how is it used in circuit design?

The TPR pin enables the two-point VCC regulator: it must be connected via a capacitor to a switching node (e.g., half-bridge OUT) to form a charge-pump structure. During OPERATING mode, the internal TPR circuit senses VCC and switches an internal PSW transistor to regulate VCC between 12.45–13.48 V, eliminating need for external charge-pump components while maintaining efficiency.