Infineon Technologies IR2167S

Overview

IR2167S from Infineon Technologies is a fully integrated 600V fluorescent lamp ballast control IC combining PFC, half-bridge gate driving, and lamp protection logic in a single SOIC-20 package. It implements critical conduction mode (CrCM) boost PFC with no current-sense resistor, programmable preheat/ignition timing, and internal fault counter for end-of-life detection. Used in electronic ballasts for T5/T8 lamps requiring high power factor (>0.98), low THD (<10%), and automatic lamp exchange.

For engineers reviewing the IR2167S datasheet, IR2167S pinout, IR2167S application, or IR2167S equivalent, key selection considerations include CrCM PFC operation without sense resistor, dual-mode oscillator (preheat/run), filament sensing via CPH pin, capacitive-mode protection, and thermal latch behavior at 160°C junction temperature.

Technical Context

The IR2167S integrates three functional blocks: a CrCM boost PFC controller with zero-current detection (ZX pin), a variable-frequency ballast oscillator with externally programmable deadtime (DT pin), and a high-voltage half-bridge driver (HO/LO outputs) with 600V floating capability. Its oscillator uses CT/RT-based ramp generation with dual thresholds (VCT+ = 4.0 V, VCT− = 2.0 V) and T-flip-flop duty control.

Protection architecture includes four independent fault inputs: CS (overcurrent), SD (lamp status/EOL), VDC (brown-out), and TJ (thermal shutdown at 160°C). Fault handling employs a sequential counter (55 cycles for CS over-threshold in ignition mode) and latched shutdown requiring VCC or SD cycling to reset - not automatic restart.

Key Specifications

Pinout & Package

Package: 20-Lead SOIC (wide body), RoHS-compliant (PbF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR2166 and IRS2166D, the IR2167S uniquely delivers filament health monitoring and EOL shutdown via SD pin voltage interpretation - a design-critical feature for medical, UV, and high-reliability commercial lighting where unmonitored lamp failure poses safety or performance risk.

Availability

IR2167S is available at Aetrix Electronics and suitable for commercial lighting ballasts, industrial fluorescent fixtures, medical-grade lighting systems, and UV germicidal lamp drivers requiring stable component supply across multi-year production cycles.

Supply support for IR2167S 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 global manufacturing and quality certification to ISO 9001 and IATF 16949.

The IR2167S belongs to Infineon's ballast control IC product line, designed specifically for high-efficiency, high-reliability electronic fluorescent lamp drivers with integrated PFC, protection, and lamp lifecycle management.

FAQ

What is the purpose of the CPH pin and how is it used in lamp sequencing?

The CPH pin serves as the preheat timing capacitor node. During preheat, it charges at 3 µA until reaching 4.1 V, signaling end-of-preheat. In ignition mode, it charges at 1 µA until 5.1 V, triggering transition to run mode. Its voltage trajectory also confirms filament continuity - a stalled CPH voltage indicates open filament, preventing unsafe ignition attempts.

How does the IR2167S implement capacitive-mode protection, and what circuit condition triggers it?

Capacitive-mode protection activates during run mode when the CS pin voltage falls below 0.2 V for ≥1 cycle - indicating resonant tank operation below resonance (capacitive region). This condition risks excessive MOSFET voltage stress and lamp instability. The IC responds by latching off both HO and LO outputs and holding COMP at 0 V until reset via VCC or SD cycling.

Can the IR2167S be used with lamps other than standard fluorescent tubes, such as cold-cathode or UV-C lamps?

Yes - the IR2167S supports cold-cathode and UV-C lamps via programmable preheat time (RPH), ignition ramp (CPH), and run frequency (RUN/RT). Its filament sensing (CPH trajectory) and EOL detection (SD pin) are equally valid for UV lamps, where filament degradation directly correlates with UV output decay. Designers must adjust RPH, RT, and DT values per lamp datasheet requirements.

What happens when thermal shutdown occurs, and how is the device recovered?

At 160°C junction temperature, the IR2167S enters latched fault mode: HO/LO/PFC outputs disable, COMP drops to 0 V, and quiescent current drops to ~150 µA. Recovery requires either cycling the SD pin (high then low) or dropping VCC below 9.5 V (falling UVLO threshold) and reapplying. No automatic restart occurs - ensuring safe cooldown before reattempting lamp ignition.