STMicroelectronics L6574D013TR

Overview

L6574D013TR from STMicroelectronics is a high-voltage fluorescent lamp ballast controller IC designed for half-bridge resonant inverters driving CFL/TL lamps. It integrates preheat timing, frequency shifting, a current-controlled oscillator, bootstrap diode, and a dedicated op amp for closed-loop lamp current control. Key specs include 600V high-side rail rating, ±50 V/ns dV/dt immunity, 250mA source / 450mA sink gate drive, 80/40ns rise/fall times (1nF load), and SO16 package.

For engineers reviewing the L6574D013TR datasheet, L6574D013TR pinout, L6574D013TR application, or L6574D013TR equivalent, this page delivers verified technical context on preheat timing constants (k_PREF = 1.5 s/µF), f_PRE/f_IGN setting via R_PREF/R_IGN/C_F, integrated bootstrap DMOS operation, VS clamping at 15.6V, and EN1/EN2 fault recovery logic - all critical for lamp ignition reliability and BOM cost reduction.

Technical Context

The L6574D013TR implements a dual-phase timing architecture: CPRE capacitor controls preheat duration (t_PRE = K_PREF·C_PREF) and frequency shift interval (t_SH = 0.1·t_PRE), while R_PREF and R_IGN set f_PRE (120 kHz typ.) and f_IGN (60 kHz typ.) independently. The oscillator operates in open-loop during start-up and transitions to closed-loop lamp current regulation via OPAMP feedback injected into the RING pin.

Its high-side driver uses synchronous bootstrap with an integrated high-voltage DMOS replacing external diodes, and features internal VS clamping (15.6 V) and UVLO (10.2 V turn-on, 8 V turn-off). EN1 provides latched shutdown for hard faults (e.g., lamp removal); EN2 restarts preheat without power cycle.

Key Specifications

Pinout & Package

Package: SO16 narrow-body (3.94 mm × 9.9 mm, 1.27 mm pitch) per STMicroelectronics mechanical drawing. RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fluorescent lamp ballast controller applications.

Compared with IRS2166DSTRPBF and BD7810FJ-E2, the L6574D013TR uniquely combines 600 V capability, integrated bootstrap DMOS, CPRE-based preheat timing, and a lamp-current op amp - enabling single-chip, high-reliability ballast designs with minimal external components.

Availability

L6574D013TR is available at Aetrix Electronics and suitable for compact fluorescent lamp ballasts, tubular fluorescent lighting systems, dimmable commercial fixtures, and hybrid LED-fluorescent retrofit modules requiring stable component supply and long-term lifecycle support.

Supply support for L6574D013TR 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 headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The L6574D013TR belongs to ST's AC-DC and lighting control product line, engineered specifically for high-efficiency, low-BOM-cost electronic ballasts targeting energy-efficient fluorescent lighting replacement in residential and commercial infrastructure.

FAQ

What is the function of the CPRE pin and how does it affect lamp life?

The CPRE pin connects to an external capacitor that sets preheat time (t_PRE = 1.5 s/µF × C_PREF) and frequency shift duration (t_SH = 0.1 × t_PRE). Accurate preheating prevents cathode sputtering during ignition, directly extending lamp life beyond 10,000 hours. The internal current sources ensure timing stability across temperature and supply voltage variations.

Can the L6574D013TR drive IGBTs instead of MOSFETs?

Yes - the L6574D013TR's 450 mA sink / 250 mA source gate drive and ±50 V/ns dV/dt immunity support standard 600 V IGBTs in half-bridge configurations. However, its dead time (0.8–1.7 µs) and rise/fall times are optimized for MOSFETs; IGBT gate charge must be verified to ensure full turn-on within the available drive strength.

How does the integrated bootstrap DMOS replace the external diode?

An internal high-voltage DMOS transistor, driven synchronously with the LVG output, charges the external bootstrap capacitor during the low-side conduction phase. This eliminates the need for an external diode and Zener clamp on VS, reducing component count, leakage paths, and thermal stress while maintaining safe V_BOOT regulation up to 618 V.

Is closed-loop lamp current control mandatory for basic operation?

No - the L6574D013TR operates fully functional in open-loop mode using R_PREF, R_IGN, and C_F to set f_PRE and f_IGN. The op amp is optional: it enables closed-loop regulation for constant lamp power under varying line voltage or aging, improving lumen maintenance and system efficiency by ±5% over open-loop designs.