Infineon Technologies IR2166

Overview

IR2166 from Infineon Technologies is a fully integrated 600V ballast control IC combining critical conduction mode (CrCM) PFC, fluorescent lamp preheat/run control, and half-bridge gate driving in a single monolithic device. It delivers high power factor (>0.97), low THD (<10%), programmable preheat time (2–5 s), run frequency (39–50 kHz), and end-of-life protection with internal ignition ramp and fault counter. Used in electronic ballasts for T5/T8 linear and compact fluorescent lamps.

For engineers reviewing the IR2166 datasheet, IR2166 pinout, IR2166 application, or IR2166 equivalent, key selection considerations include CrCM PFC regulation accuracy, dual-mode oscillator programming (preheat vs. run), VBUS undervoltage reset behavior, shutdown pin hysteresis thresholds, and compatibility with discrete 600V half-bridge MOSFETs in lamp driver topologies.

Technical Context

The IR2166 implements a dedicated analog control architecture: its PFC stage uses zero-current detection (ZX pin) and error amplifier feedback (COMP) to regulate DC bus voltage via CrCM boost operation without a current-sense resistor. The ballast controller integrates two independent oscillators-one for preheat (73–84 kHz) and one for run mode (39–50 kHz)-both programmable via external RPH/RT and CT components.

Protection logic includes a 25–90-cycle fault counter for lamp strike failure, dual shutdown thresholds (4.5–5.6 V for reset, 2.4–3.6 V for EOL), and automatic transition through UVLO → PREHEAT → IGNITION RAMP → RUN states. Internal 15.6 V zener clamp on VCC and micropower startup (150 µA) support robust offline operation.

Key Specifications

Pinout & Package

IR2166 is available in 16-lead PDIP and 16-lead narrow-body SOIC packages, both with standard 0.3-inch DIP or 150-mil SOIC body dimensions and 0.050-inch lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with FAN7711, IR2166 reduces component count via integrated PFC gate driver and eliminates external level-shifting complexity; versus IRS2166D, it offers identical functionality but differs only in packaging (PDIP vs. SOIC) and traceability-no electrical or timing trade-offs.

Availability

IR2166 is available at Aetrix Electronics and suitable for commercial lighting ballasts, CFL driver modules, LED retrofit tube PFC stages, and industrial UV lamp systems requiring stable component supply across multi-year production cycles.

Supply support for IR2166 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in high-voltage gate drivers and lighting control solutions.

The IR2166 belongs to Infineon's ballast control IC product line, designed specifically for cost-sensitive, high-reliability fluorescent lamp electronic ballasts requiring integrated PFC, preheat, ignition, and half-bridge drive in a single chip.

FAQ

What is the minimum recommended VCC bypass capacitance for stable IR2166 operation?

A minimum 10 µF low-ESR electrolytic capacitor plus 100 nF ceramic capacitor must be placed directly between VCC and COM pins. This ensures sufficient charge reservoir for the internal 15.6 V zener clamp during high-current gate drive events and prevents UVLO triggering during transient load steps.

How does the IR2166 detect end-of-life in fluorescent lamps?

End-of-life detection occurs when the SD/EOL pin voltage falls within 2.4–3.6 V (rising) or 0.7–1.6 V (falling), indicating cathode emission degradation. This threshold is monitored continuously in RUN mode; crossing it latches the IC into FAULT mode until power cycle or SD/EOL > 4.5 V reset.

Can the IR2166 drive 600V MOSFETs directly without external level shifters?

Yes-the IR2166 integrates high-side and low-side drivers capable of directly driving 600V-rated MOSFETs. Its HO and LO outputs deliver 300 mA source / 400 mA sink current with 110 ns rise time, and VB pin supports up to 625 V offset, enabling direct bootstrap-based half-bridge control.

What external components define the preheat-to-run frequency transition?

The transition is controlled by RPH (preheat frequency), RT (run frequency), and CT (timing capacitor). At CPH > (VCC − 2 V), the internal logic switches oscillator control from RPH/CT to RT/CT, ramping frequency from 73–84 kHz to 39–50 kHz over ~100 ms-no external circuitry required.