Infineon Technologies IR21593SPBF

Overview

IR21593SPBF from Infineon Technologies is a dimming electronic ballast controller and 600V half-bridge gate driver integrated in a single 16-pin SOIC package. It delivers closed-loop lamp power and preheat current control, programmable ignition-to-dim timing (1–5 s), 0.5–5 VDC analog dimming input, and internal current-sense blanking for fluorescent lamp systems. Used in commercial dimmable CFL and T5/T8 ballasts with single-lamp topology.

For engineers reviewing the IR21593SPBF datasheet, IR21593SPBF pinout, IR21593SPBF application, or IR21593SPBF equivalent, key selection criteria include VCO frequency range (30–230 kHz), HO/LO deadtime (1.0 µs), thermal shutdown at 165°C, and compatibility with transformer-less lamp power sensing architectures.

Technical Context

The IR21593SPBF implements phase-controlled lamp power regulation using a voltage-controlled oscillator (VCO) with externally set minimum frequency (via RFMIN resistor). Its architecture integrates preheat current regulation via IPH/CPH pins, lamp ignition detection through CS pin slew-rate monitoring, and automatic mode transitions between UVLO, preheat, ignition, dim, and fault states.

It features dual-level protection: overcurrent detection (VCSTH = 1.6 V threshold), thermal shutdown (TSD = 165°C), brown-out immunity (VCCUV+ = 12.5 V), and shutdown latching (SD pin threshold = 2.0 V). The high-side floating supply (VB up to 625 V) supports direct connection to 600 V half-bridge topologies without external level shifters.

Key Specifications

Pinout & Package

IR21593SPBF is housed in a 16-pin narrow-body SOIC package (body width 3.9 mm, JEDEC MS-012AC), optimized for surface-mount assembly in compact ballast PCBs. Thermal resistance RthJA = 115°C/W under still-air conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR21592SPBF and IRS2166DSPBF, the IR21593SPBF offers the widest VCO range (30–230 kHz) and finest dimming resolution (0.5–5 V linear input), making it optimal for high-efficiency, digitally tunable fluorescent ballasts where lamp power accuracy and thermal resilience are critical.

Availability

IR21593SPBF is available at Aetrix Electronics and suitable for commercial lighting, industrial warehouse fixtures, and emergency lighting systems requiring stable component supply, long-life lamp operation, and certified dimming compliance (IEC 61000-3-2 Class C).

Supply support for IR21593SPBF 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 IR2159x series was designed specifically for digital dimmable fluorescent ballasts, emphasizing transformer-less sensing, programmable preheat, and integrated fault protection to replace multi-chip discrete ballast controllers.

FAQ

What is the function of the CPH pin on the IR21593SPBF?

The CPH pin serves as the preheat timing integrator node. It charges via IPH current during preheat mode and triggers ignition detection when reaching 5.0 V. Its voltage decay after lamp strike signals successful ignition and initiates transition to dim mode. External capacitor value sets preheat duration.

How does the IR21593SPBF implement transformer-less lamp power sensing?

It uses phase-control feedback derived from the VDC (line voltage) and CS (half-bridge current) pins. By comparing zero-crossing timing and current amplitude against internal references, it calculates lamp power without auxiliary windings or current transformers-reducing cost and size while maintaining ±3% regulation accuracy.

Can the IR21593SPBF drive MOSFETs directly without external gate resistors?

No. While the HO and LO outputs provide 500 mA drive capability, external gate resistors (typically 10–47 Ω) are required to control MOSFET turn-on/turn-off slew rates, suppress ringing, and limit peak current into gate capacitance-critical for EMI compliance and half-bridge reliability.

What happens when the SD pin voltage exceeds 2.0 V?

The device enters latched fault mode: HO and LO outputs disable immediately, CPH resets to 0 V, and VCC current rises to 240 µA. Operation remains suspended until SD falls below 1.85 V (150 mV hysteresis) and VCC recovers above 12.5 V, ensuring safe recovery after lamp removal or overtemperature events.