Infineon Technologies IRS2158DSTRPBF

Overview

IRS2158DSTRPBF from Infineon Technologies (formerly International Rectifier) is a fully integrated 600V half-bridge ballast control IC for fluorescent lamp drivers. It combines programmable preheat (63–73 kHz), ignition current regulation, run frequency (42.5–48.5 kHz), deadtime (1.5 µs), and end-of-life protection in a single SOIC-16 package. Used in electronic ballasts for T5/T8 lamps with dimming capability down to <5%.

For engineers reviewing the IRS2158DSTRPBF datasheet, IRS2158DSTRPBF pinout, IRS2158DSTRPBF application, or IRS2158DSTRPBF equivalent, key selection criteria include V_OFFSET = 600 V, I_O+/I_O− = 180/260 mA, micropower startup (250 µA), closed-loop ignition current regulation, and programmable SD/EOL shutdown thresholds.

Technical Context

The IRS2158DSTRPBF implements a voltage-controlled oscillator (VCO) with dual-mode operation: preheat (fixed-frequency, 68 kHz typ.), ignition (current-regulated ramp), and run (45.5 kHz typ.). Its internal op amp supports analog dimming via VCO pin control, while the CS pin enables over-current sensing with 1.2 V threshold and 60-event fault counter.

Protection architecture includes brownout detection (V_CCUV+ = 12.5 V), latch-immune shutdown via SD/EOL pins, and zener-clamped V_CC (15.6 V). The high-side floating supply (V_B–V_S) sustains up to 600 V offset, and bootstrap MOSFET integration eliminates external gate-drive charge pumps.

Key Specifications

Pinout & Package

IRS2158DSTRPBF is housed in a 16-pin narrow-body SOIC (SOICN16) package with standard 1.27 mm pitch, RoHS-compliant, MSL2 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS2158DSTRPBF, IRS2168DSTRPBF offers higher voltage tolerance and soft-start but removes the convenience of internal V_CC clamping; BD78302FJ-E2 simplifies power supply design with an integrated LDO but sacrifices EOL monitoring and high-voltage robustness.

Availability

IRS2158DSTRPBF is available at Aetrix Electronics and suitable for fluorescent lamp ballasts, dimmable lighting systems, lamp failure protection circuits, and industrial fluorescent fixtures requiring stable component supply and long-term lifecycle support.

Supply support for IRS2158DSTRPBF 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 IRS2158DSTRPBF belongs to Infineon's fluorescent ballast control product line, engineered specifically for energy-efficient, digitally programmable electronic ballasts with comprehensive lamp protection and dimming capability.

FAQ

What is the function of the CPH pin?

The CPH pin outputs voltage thresholds that indicate operational mode: 9.3 V during preheat, 4.7 V during ignition, and 9.3 V again in run mode. It serves as a diagnostic output for microcontroller monitoring and enables external circuitry to synchronize auxiliary functions like thermal derating or status LEDs based on ballast phase.

How does the IRS2158DSTRPBF implement closed-loop ignition current regulation?

During ignition, the IRS2158DSTRPBF regulates lamp current by discharging the VCO pin at 215 µA while monitoring the CS pin. When sensed current exceeds 1.2 V, the VCO discharge rate adjusts dynamically to maintain constant current until the lamp strikes, preventing filament overcurrent and ensuring reliable ignition across lamp aging.

Can the IRS2158DSTRPBF drive MOSFETs directly without external gate resistors?

No - although the IRS2158DSTRPBF provides 180/260 mA gate drive, external gate resistors (typically 10–22 Ω) are required to dampen ringing, control slew rate, and prevent parasitic oscillation in high-dV/dt half-bridge layouts. The internal bootstrap MOSFET only replaces the external diode, not the gate resistor.

What is the purpose of the 60-event fault counter?

The 60-event counter accumulates transient over-current events detected at the CS pin during preheat or run mode. It prevents false shutdowns from brief inrush or noise spikes while reliably triggering fault mode after sustained abnormal conditions - a design feature critical for distinguishing between lamp-strike transients and true filament failure.