Infineon Technologies IRS2573DSPBF

Overview

IRS2573DSPBF from Infineon Technologies (formerly International Rectifier) is a fully-integrated 600V HID ballast control IC combining buck pre-regulator, full-bridge inverter driver, and lamp ignition controller in a single SOIC-28W package. It delivers continuous/critical-conduction-mode buck control, 600V high/low-side full-bridge driving (180mA/260mA/400mA drive capability), constant lamp power regulation, and programmable fault counters for lamp open-circuit, short-circuit, and end-of-life detection - deployed in commercial and industrial HID lighting systems.

For engineers reviewing the IRS2573DSPBF datasheet, IRS2573DSPBF pinout, IRS2573DSPBF application, or IRS2573DSPBF equivalent, key selection criteria include its integrated 600V floating drivers, dual OTA-based current/voltage error amplifiers, programmable ignition timing (21 sec typical), lamp voltage/current sense thresholds (1.18 V CS threshold, 0.5 V nominal PSENSE), and SOIC-28W thermal performance (R_ΘJA = 78 °C/W).

Technical Context

The IRS2573DSPBF implements a dual-loop control architecture: an inner buck current loop (via ICOMP/PCOMP OTA amplifiers) regulates pre-regulated bus voltage, while an outer lamp power loop (KMULT = 2.0 V/V² multiplier) maintains constant lamp power by multiplying sensed lamp voltage (VSENSE) and current (ISENSE). Its full-bridge oscillator operates at 200 Hz typical with 50% ±1% duty cycle and 1.2 µs deadtime to prevent shoot-through.

Protection logic integrates six independent programmable fault counters - including fast transient lamp under-voltage detection (16384 cycles), ignition timeout (21 sec), and good-fault reset (2730 sec) - all triggered by analog comparators with defined thresholds (e.g., VZX = 2.0 V, VTOFF = 2.05 V) and clamped inputs (VCLAMP1 = 15.6 V, VCLAMP2 = 20.8 V).

Key Specifications

Pinout & Package

IRS2573DSPBF is housed in a 28-pin wide-body SOIC (SOIC28W) package with exposed thermal pad, rated MSL3 per J-STD-020. The package supports board-level heat dissipation and meets industrial qualification (JEDEC Class B ESD, Class I latch-up).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS2573DSPBF, IRS2575DSPBF trades lamp diagnostic granularity for supply integration, while UCC2897APW shifts complexity to external components - making IRS2573DSPBF optimal for cost-sensitive, high-volume HID ballasts needing turnkey lamp protection.

Availability

IRS2573DSPBF is available at Aetrix Electronics and suitable for street lighting ballasts, industrial high-bay fixtures, commercial parking lot systems, and stadium floodlighting requiring stable component supply and long-term HID lamp compatibility.

Supply support for IRS2573DSPBF 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 global semiconductor leader specializing in power management, automotive, and industrial control ICs, with heritage from International Rectifier's high-voltage analog expertise.

The IRS2573D product line was engineered specifically for electronic HID ballasts - integrating protection, regulation, and timing functions to replace discrete control solutions in 70–1000W lighting systems.

FAQ

What is the function of the ZX pin on IRS2573DSPBF?

The ZX (zero-crossing) pin monitors buck inductor current zero-crossing to enable critical-conduction-mode (CRM) operation. Its comparator has a 2.0 V threshold and 400 mV hysteresis, ensuring accurate timing of buck switch turn-on at current valley. This minimizes conduction losses and EMI in the pre-regulator stage.

How does the IRS2573DSPBF implement constant lamp power control?

It uses an analog multiplier (KMULT = 2.0 V/V²) that computes lamp power as P_LAMP ∝ V_SENSE × I_SENSE. The resulting PSENSE signal (nominal 0.5 V) feeds the PCOMP OTA amplifier, which adjusts buck output voltage to maintain constant product - compensating for lamp resistance changes over lifetime.

Can IRS2573DSPBF drive MOSFETs directly without external gate resistors?

No. While it provides 400 mA BUCK and 260 mA LO1/LO2 drive strength, external gate resistors (typically 10–47 Ω) are required to dampen ringing, control dV/dt, and prevent parasitic oscillation in high-di/dt HID ballast circuits. Layout-dependent stray inductance makes fixed internal resistance insufficient.

What thermal design considerations apply to the SOIC-28W package?

The SOIC-28W has R_ΘJA = 78 °C/W. To maintain T_J ≤ 125°C at 1.6 W dissipation, the PCB must provide ≥ 200 mm² of 2-oz copper connected to the exposed thermal pad. Vias under the pad (≥ 6 × 0.3 mm) to inner ground planes are mandatory; ambient temperature must be limited to ≤ 55°C in enclosed fixtures.