Infineon Technologies IRS2509CD

Overview

IRS2509CD from Infineon Technologies is a high-voltage, half-bridge gate driver IC designed for driving external N-channel MOSFETs in resonant LLC and ballast lamp control applications. It features 600 V high-side floating capability, integrated bootstrap diode, 120 ns propagation delay, and operates from 10–20 V supply with -40°C to +125°C junction temperature range.

For engineers reviewing the IRS2509CD datasheet, IRS2509CD pinout, IRS2509CD application, or IRS2509CD equivalent, key selection criteria include high-side voltage rating, propagation delay matching between channels, dead-time control accuracy, and thermal performance in compact lighting and power supply designs.

Technical Context

The IRS2509CD integrates independent high- and low-side drivers with matched propagation delays (120 ns typical) and built-in interlock logic to prevent shoot-through. Its floating high-side section supports operation up to 600 V DC with dV/dt immunity exceeding 50 V/ns.

It uses a level-shifted architecture with internal bootstrap diode and accepts CMOS/TTL-compatible input signals. The device lacks integrated current sensing or PWM generation-external timing control is required via dedicated HO/LO inputs and dead-time set by external RC network.

Key Specifications

Pinout & Package

IRS2509CD is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for thermal dissipation in compact lighting modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge gate driver applications.

Compared with IR2153DSTRPBF and UCC27211D, the IRS2509CD uniquely balances integrated bootstrap functionality, matched timing, and proven ruggedness in thermally constrained lighting applications-making it optimal for high-volume, reliability-critical resonant drivers where layout simplicity and timing precision are prioritized.

Availability

IRS2509CD is available at Aetrix Electronics and suitable for LED streetlight drivers, electronic CFL ballasts, induction cooktop inverters, and industrial DC-DC resonant converters requiring stable component supply and long-term manufacturability.

Supply support for IRS2509CD 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 semiconductors, microcontrollers, and sensor solutions for automotive, industrial, and power conversion markets.

The IRS2509CD belongs to Infineon's high-voltage gate driver product line, engineered specifically for energy-efficient lighting and resonant power conversion systems demanding robust isolation, precise timing, and thermal resilience.

FAQ

What is the maximum recommended switching frequency for IRS2509CD?

The IRS2509CD supports reliable operation up to 1 MHz, but its optimal use case is 200–600 kHz in LLC resonant converters. At higher frequencies, gate drive loss and propagation delay mismatch become more critical; thermal management must be verified per layout and load conditions.

Does IRS2509CD require an external bootstrap capacitor?

Yes, an external bootstrap capacitor (typically 100–220 nF ceramic) is required between VBS and VS pins. The internal bootstrap diode charges this capacitor during the LO high phase; capacitor value and ESR directly affect high-side drive stability at high duty cycles.

Can IRS2509CD drive IGBTs directly?

No, IRS2509CD is optimized for N-channel MOSFETs with gate thresholds ≤4 V. Driving IGBTs requires higher gate drive voltage (≥15 V) and longer tail current; use Infineon's 1EDCxx or 2EDNxx families for IGBT-specific gate driving.

Is there a recommended PCB layout practice for minimizing noise coupling on the VS pin?

Yes: route the VS trace as a short, low-inductance path directly to the source of the high-side MOSFET; avoid sharing copper pours with noisy signals; place the bootstrap capacitor within 3 mm of VBS/VS pins; and use separate ground planes for power and logic sections with single-point connection at COM.