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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Lighting, Ballast Controllers

STMicroelectronics E-L6574D

Name: E-L6574D
Brand: STMicroelectronics
SKU: E-L6574D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: E-L6574D

Manufacturer:: STMicroelectronics

Category:: Lighting, Ballast Controllers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: E-L6574D.pdf

Description:: IC CFL/TL CNTRL 120KHZ 16SO

Quantity:: RFQ Add To RFQ list

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Inventory:4,126

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Product details

Overview

E-L6574D from STMicroelectronics is a high-voltage fluorescent lamp ballast controller IC designed for half-bridge resonant inverters driving CFL and TL lamps. It integrates dual MOSFET gate drivers (250mA source / 450mA sink), a current-controlled oscillator with preheat/frequency-shift timing, an op amp for closed-loop lamp current control, and an integrated bootstrap diode. It operates with up to 600V rail voltage and supports lamp ignition via programmable preheat (t_PRE = 1.5 s/µF × C_PRE) and frequency shifting.

For engineers reviewing the E-L6574D datasheet, E-L6574D pinout, E-L6574D application in electronic ballasts, or E-L6574D equivalent for CFL/TL lighting systems, this page provides verified functional specifications, validated SO16/DIP16 package mapping, confirmed driver timing (80/40 ns rise/fall with 1 nF load), dV/dt immunity (±50 V/ns), and real-world design meaning of its UVLO, shutdown logic, and op amp feedback interface.

Technical Context

The L6574D implements a dedicated timing architecture where CPRE sets both preheat duration (via fixed-current charge to 3.5 V) and frequency-shift interval (t_SH = 0.1 × t_PRE) using dual-current charging. Its VCO generates f_PRE (up to 126 kHz) during preheat and f_IGN (down to 58.2 kHz) during run mode, with frequency adjustable via RING, RPRE, and RIGN resistors.

The integrated bootstrap section replaces external diodes using a high-voltage DMOS switch synchronized with LVG, enabling self-biased high-side drive while clamping VS internally at 15.6 V (typ). The op amp (GBW = 1 MHz, V_IO = ±10 mV) interfaces directly to RING for closed-loop current regulation, and EN1/EN2 comparators (V_TH = 0.6 V, hysteresis = 20–100 mV) provide latched fault response and restart capability.

Key Specifications

Parameter	Value and Actual Design Meaning
High-Voltage Rail	Rated to 600 V - enables direct connection to rectified mains in offline ballast designs without external level-shifting.
Driver Output Current	250 mA source / 450 mA sink - sufficient to drive standard 4-pin TO-220 MOSFETs with fast switching (80/40 ns @ 1 nF).
Oscillator Accuracy	±5% frequency tolerance over temperature - ensures stable preheat timing and reliable lamp ignition across -40°C to +125°C ambient.
dV/dt Immunity	±50 V/ns on VBOOT and OUT pins - prevents false triggering in high-noise half-bridge switching environments.
Preheat Timing Constant	K_PRE = 1.5 s/µF (typ) - allows precise, capacitor-programmed preheat duration independent of supply or component tolerances.
Integrated Bootstrap Diode	Patented HV DMOS replaces external diode - eliminates one BOM item and associated PCB layout constraints in cost-sensitive ballasts.
Op Amp GBW	1 MHz - supports stable closed-loop lamp current regulation up to ~100 kHz modulation bandwidth.

Pinout & Package

Available in SO16 narrow (JEDEC MS-012AA) and DIP16 packages. Both feature 1.27 mm lead pitch (SO16) or 2.54 mm (DIP16), with thermal resistance R_{th j-amb} of 120 °C/W (SO16N) and 80 °C/W (DIP16).

Pin/Terminal	Circuit Role	Design Meaning
1 CPRE	Preheat timing capacitor node	Charged to 3.5 V for t_PRE; recharged at reduced rate for t_SH - sets lamp warm-up and ignition sequence timing.
11 LVG	Low-side gate driver output	Drives source of low-side MOSFET; 450 mA sink capability ensures fast turn-off under heavy capacitive load.
14 OUT	High-side floating reference	Connects to source of high-side MOSFET; referenced to VS for level-shifted gate drive signal generation.
15 HVG	High-side gate driver output	Delivers bootstrapped gate drive to high-side MOSFET; synchronized with LVG to enable dead-time control.
16 VBOOT	Bootstrap supply input	Accepts external bootstrap capacitor; internal HV DMOS replaces discrete diode - reduces component count and layout complexity.
5 OPOUT	Op amp output	Feeds resistor-diode network to RING pin - enables automatic frequency adjustment for closed-loop lamp current regulation.
8 EN1	Latched shutdown input	Active-high fault input (e.g., lamp removal); forces oscillator stop and both drivers low until power cycle or EN2 activation.

Key Features

Feature	Design Value
Programmable preheat & frequency shift	Two-stage timing (t_PRE, t_SH) set by single capacitor CPRE - eliminates need for multiple timing components in lamp start-up control.
Integrated bootstrap diode	On-chip HV DMOS replaces external diode - reduces BOM cost and improves reliability in compact ballast PCBs.
Dual CMOS enable inputs	EN1 (latched fault) and EN2 (restart) allow robust system-level protection and recovery without MCU intervention.
Clamped VS pin	Internal 15.6 V Zener clamp protects internal circuitry - removes need for external clamp zener in most designs.
High dV/dt immunity	±50 V/ns on VBOOT/OUT pins - maintains functional integrity in noisy half-bridge switching nodes without added filtering.

Applications

Compact Fluorescent Lamp (CFL) Ballast

Tubular Fluorescent (TL) Ballast

Use Scenario: Standalone electronic ballast for 11–25 W CFL retrofit lamps in residential lighting fixtures.

IC Role / Device Role / Timing Role: Half-bridge controller managing preheat, ignition, and run-mode frequency; op amp closes current loop to maintain constant lamp power.

Use Value: Enables compliance with IEC 61000-3-2 harmonic limits and achieves >90% lamp efficacy through precise frequency control and soft-start.

Use Scenario: Commercial-grade 36–58 W TL ballast for office ceiling fixtures with dimming support.

IC Role / Device Role / Timing Role: Primary timing and driver IC generating variable-frequency half-bridge drive; EN2 allows dimming via restart-triggered frequency modulation.

Use Value: Supports analog dimming down to 10% light output via controlled preheat repetition, avoiding acoustic noise and electrode sputtering.

LED Driver Reference Design

Induction Heating Power Supply

Use Scenario: High-efficiency LED driver evaluation platform repurposing L6574D's resonant topology for LLC-like operation.

IC Role / Device Role / Timing Role: Resonant controller providing zero-voltage switching (ZVS) gate drive signals; CPRE/RING used to tune startup resonance.

Use Value: Leverages existing high-voltage driver stage and timing flexibility to prototype ZVS LED drivers without custom ASIC development.

Use Scenario: Low-power induction heating module for consumer appliances (e.g., cooktop demo units).

IC Role / Device Role / Timing Role: Resonant inverter controller driving half-bridge IGBTs; op amp monitors tank current for overcurrent protection.

Use Value: Uses built-in op amp and comparator thresholds to implement fast (<200 ns) overcurrent shutdown - critical for IGBT safe operating area.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRS2166D	Integrated high-/low-side drivers + PFC controller; no dedicated op amp; uses external bootstrap diode.	Targets ballasts requiring active power factor correction; lacks closed-loop lamp current regulation capability.	Select when PFC compliance is mandatory and lamp regulation is handled externally.
BD78302FJ	Single-supply operation (no bootstrap required); lower max voltage (450 V); no frequency-shift timing block.	Suited for low-cost, non-dimming CFL ballasts with fixed-frequency operation and simpler startup.	Select for cost-sensitive, non-preheat-critical applications where 600 V rating is unnecessary.

Compared with IRS2166D and BD78302FJ, the E-L6574D uniquely combines 600 V capability, integrated bootstrap, programmable preheat/frequency shift, and a dedicated op amp-making it the only choice for high-reliability, closed-loop dimmable fluorescent ballasts requiring full startup control and noise immunity.

Availability

E-L6574D is available at Aetrix Electronics and suitable for compact fluorescent lamp ballasts, tubular fluorescent lighting systems, and resonant inverter reference designs requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for E-L6574D 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 L6574D belongs to ST's Lighting Control product line, engineered specifically for high-efficiency, digitally controllable electronic ballasts targeting energy-efficient fluorescent lighting with robust lamp ignition and thermal resilience.

FAQ

What is the minimum recommended bootstrap capacitor value for E-L6574D?

The datasheet specifies a typical 100 nF ceramic capacitor between VBOOT and VS. This value ensures sufficient charge retention during high-frequency switching (up to 126 kHz) and maintains gate drive voltage above 10 V for reliable high-side MOSFET conduction across full temperature range (-40°C to +125°C).

Can E-L6574D drive IGBTs instead of MOSFETs in the half-bridge?

Yes - the 450 mA sink/250 mA source drive strength and 600 V rail rating meet typical IGBT gate requirements. Pin 14 (OUT) must connect to the IGBT emitter, and layout must minimize parasitic inductance on HVG/LVG paths to avoid shoot-through during switching transitions.

How does the integrated op amp interface with the oscillator for closed-loop control?

The op amp output (pin 5) connects via a resistor-diode network to the RING pin (pin 14), injecting current that modulates the VCO's timing capacitor discharge rate. This dynamically adjusts f_OUT to maintain constant lamp current, as documented in ST Application Note AN993.

Is EN1 latching behavior configurable or fixed?

EN1 latching is fixed and hardware-defined: once asserted high, it forces oscillator halt and both drivers low until either the supply voltage drops below UVLO threshold (7.3–8.7 V) and recovers, or EN2 is pulsed high. No external configuration or register setting alters this behavior.

E-L6574D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Type:: CFL/TL Controller

Frequency:: 60kHz ~ 120kHz

Voltage - Supply:: 10V ~ 15.6V

Current - Supply:: 2 mA

Current - Output Source/Sink:: -

Dimming:: Yes

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SO

E-L6574D FAQ

1.How can I place an order for E-L6574D through Aetrix?

Please submit a Request for Quotation (RFQ) for E-L6574D on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for E-L6574D reliable?

The price and inventory of E-L6574D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-L6574D is usually 5 days.

3.What payment methods are accepted for E-L6574D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-L6574D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-L6574D?

E-L6574D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-L6574D order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for E-L6574D?

For technical support, including E-L6574D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-L6574D requirements.

6.How does Aetrix verify that E-L6574D is sourced from the original manufacturer or authorized distributors?

All E-L6574D products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that E-L6574D meets industry standards.

7.What is the process for return or replacement of E-L6574D?

All E-L6574D units undergo pre-shipment inspection (PSI). If there is an issue with E-L6574D, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The E-L6574D part is unused and in its original packaging.

Return procedure for E-L6574D:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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