Infineon Technologies IRS2158DSPBF

Overview

IRS2158DSPBF from Infineon Technologies (formerly International Rectifier) is a fully integrated 600 V half-bridge ballast control IC for fluorescent lamp drivers. It integrates programmable preheat time (63–73 kHz), ignition ramp, closed-loop ignition current regulation, and end-of-life detection with a 60-event fault counter. Used in electronic ballasts for T5/T8 lamps requiring dimming below 5%.

For engineers reviewing the IRS2158DSPBF datasheet, IRS2158DSPBF pinout, IRS2158DSPBF application, or IRS2158DSPBF equivalent, key selection criteria include V_OFFSET = 600 V, I_O+/I_O− = 180/260 mA, micropower startup (250 µA), programmable deadtime (1.5 µs), and internal 15.6 V zener clamp on VCC.

Technical Context

The IRS2158DSPBF implements a voltage-controlled oscillator (VCO) architecture with separate preheat, ignition, and run modes controlled by CPH pin thresholds (9.3 V rise for preheat end, 4.7 V fall for ignition start). Its dual-output half-bridge driver uses bootstrap high-side gate drive with internal MOSFET and 15.6 V VCC clamp.

Protection logic includes CS pin overcurrent sensing (1.2 V threshold), SD/EOL latched shutdown, brownout UVLO (12.5 V rising threshold), and 60-event current-sense up/down fault counter. The low-offset op amp supports analog dimming or lamp power regulation.

Key Specifications

Pinout & Package

IRS2158DSPBF is available in 16-pin narrow-body SOIC (SOICN16) package with standard 1.27 mm pitch and exposed pad thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS2157DSPBF, the IRS2158DSPBF adds VCO-based ignition regulation and EOL detection for longer lamp life; versus IR2159DSPBF, it trades PFC integration for smaller footprint and lower system cost in non-PFC designs.

Availability

IRS2158DSPBF is available at Aetrix Electronics and suitable for fluorescent lamp dimming systems, T5/T8 electronic ballasts, compact CFL drivers, and LED-compatible fluorescent retrofit solutions requiring stable component supply and long-term lifecycle support.

Supply support for IRS2158DSPBF 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 acquired International Rectifier in 2015 and continues its legacy of high-voltage power ICs for lighting, motor control, and power conversion.

The IRS2158D product line targets fluorescent lamp ballast applications requiring integrated protection, programmable timing, and robust half-bridge gate driving in industrial and commercial lighting systems.

FAQ

What is the function of the CPH pin in IRS2158DSPBF?

The CPH pin controls the ballast state machine: a rising voltage above 9.3 V ends preheat mode, falling below 4.7 V initiates ignition, and rising again above 9.3 V transitions to run mode. It interfaces with an external RC network to set preheat duration and detect lamp ignition success via voltage decay.

How does the IRS2158DSPBF implement closed-loop ignition current regulation?

During ignition, the CS pin senses half-bridge current through a shunt resistor. When current exceeds 1.2 V threshold, the VCO pin discharges at 215 µA to reduce frequency and maintain constant lamp current. This feedback loop stabilizes ignition without external op amp compensation.

Can IRS2158DSPBF drive 600 V MOSFETs directly without external level shifters?

Yes-the HO output is a floating high-side driver referenced to the VS node, rated for 600 V offset between VB and VS. It drives standard 600 V MOSFET gates directly when used with appropriate gate resistors and bootstrap capacitor (typically 0.1 µF ceramic).

What protection features prevent damage during lamp failure?

The IRS2158DSPBF includes CS overcurrent shutdown, SD/EOL latched shutdown for end-of-life detection, 60-event fault counter for repeated strike failures, brownout UVLO, and internal 15.6 V VCC clamp. These collectively prevent MOSFET destruction during open-filament, short-circuit, or no-strike conditions.