STMicroelectronics L6585DETR

Overview

L6585DETR from STMicroelectronics is a dual-function integrated circuit combining a transition-mode PFC controller and a half-bridge ballast controller in a single SO-20 package. It delivers 3% oscillator precision, 1.2 µs dead time, programmable end-of-life protection, choke saturation detection for both PFC and half-bridge stages, and integrated high-current gate drivers (300 mA source / 600 mA sink for PFC; 290 mA source / 480 mA sink for half-bridge), enabling compact, high-efficiency electronic fluorescent lamp ballasts up to 160 W.

For engineers reviewing the L6585DETR datasheet, L6585DETR pinout, L6585DETR application, or L6585DETR equivalent, key selection considerations include its dual-stage control architecture, THD optimizer functionality, precise preheat/ignition timing programmability, HBCS 3-level current sensing thresholds, and EOL detection compatibility with lamp-to-ground and block-capacitor-to-ground configurations.

Technical Context

The L6585DETR implements a voltage-mode error amplifier (2.52 V ±2% reference) for PFC output regulation and a high-linearity multiplier with THD optimizer to shape sinusoidal input current across wide input voltage and load ranges. Its ZCD input enables zero-current switching in transition mode via auxiliary winding sensing, with internal starter pulses at ~15 kHz during startup.

The half-bridge section integrates a programmable oscillator with independent preheating/ignition/run frequency control, smart hard-switching detection (350-event latch), and three-tier HBCS current monitoring (1.05 V run-mode limit, 1.6 V ignition-mode clamp, 2.75 V anti-saturation/hard-switching threshold), all coordinated by state-machine logic for lamp aging management and fault recovery.

Key Specifications

Pinout & Package

Package: SO-20 (Small Outline, 20-pin, 0.600" width, ECOPACK® RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-stage PFC + ballast control applications.

Compared with IR2159SPBF and L6574DTR, the L6585DETR uniquely integrates both PFC and ballast control with co-optimized protection (choke saturation, hard-switching, EOL), enabling single-chip 160 W ballasts with superior THD performance and lamp lifecycle management-neither alternative provides this level of functional consolidation or application-specific feature set.

Availability

L6585DETR is available at Aetrix Electronics and suitable for compact fluorescent lamp ballasts, linear T5/T8 electronic ballasts, auxiliary PFC stages for LED drivers, and industrial UV-C germicidal lamp systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for L6585DETR 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The L6585DETR belongs to ST's Lighting & Power Conversion IC product line, engineered specifically for high-integration electronic ballast designs that demand combined PFC and resonant half-bridge control with comprehensive lamp protection and aging management.

FAQ

What is the maximum lamp power supported by the L6585DETR?

The L6585DETR supports electronic ballast designs up to 160 W, enabled by its high-current gate drivers (300 mA source / 600 mA sink for PFC; 290 mA source / 480 mA sink per half-bridge side) and thermal design validated for SO-20 package operation at TJ ≤ 150 °C under continuous full-load conditions.

How does the THD optimizer improve power factor correction performance?

The THD optimizer dynamically adjusts the multiplier's gain curve based on input voltage and load conditions, compensating for non-linearities in the PFC current loop. This maintains total harmonic distortion below 10% across 90–264 VAC input and 30–100% lamp loading-without requiring external trimming components or firmware calibration.

Can the L6585DETR be used in PFC-only applications without the ballast function?

Yes-the half-bridge section can be disabled by grounding the EOI pin and leaving HBCS unconnected. In this configuration, the IC operates solely as a transition-mode PFC controller using MULT, ZCD, PFCCS, COMP, and INV pins, retaining full OVP, UVLO, feedback disconnection, and choke saturation protection features.

What protection features are active during lamp end-of-life (EOL)?

During EOL, the L6585DETR activates its window comparator on EOL/EOLP pins to detect abnormal lamp impedance. Upon confirmation, it initiates controlled shutdown: reducing half-bridge frequency, increasing current limit threshold, and ultimately latching off after configurable timeout-preventing acoustic resonance, overheating, or catastrophic failure in aged lamps.