Infineon Technologies IRS2540PBF

Overview

IRS2540PBF from Infineon Technologies is a 200 V high-voltage, high-frequency buck LED regulator control IC with integrated 8-pin SOIC/DIP package. It implements time-delayed hysteretic current regulation using a ±2% on-chip bandgap reference (500 mV IFB threshold), 140 ns deadtime, and dual gate drivers (HO/LO) for external MOSFETs in constant-current LED lighting systems.

For engineers reviewing the IRS2540PBF datasheet, IRS2540PBF pinout, IRS2540PBF application, or IRS2540PBF equivalent, key selection criteria include its 200 V VB rating, micropower startup (<500 µA), 15.6 V VCC zener clamp, PWM dimmability via ENN pin, and watchdog timer–enabled open-circuit protection for reliable LED driver design.

Technical Context

The IRS2540PBF operates as a free-running, time-delayed hysteretic buck controller-eliminating need for external frequency-setting components. Regulation relies on direct comparison of sensed IFB voltage against a 500 mV internal reference, with dV/dt filtering to reject noise during switching transitions.

Its dual-output architecture delivers synchronized HO and LO gate drive signals with 140 ns programmable deadtime to prevent shoot-through. A built-in watchdog timer (20 µs period, 1 µs pulse width) actively recharges the bootstrap capacitor during open-circuit conditions, sustaining high-side drive capability without external circuitry.

Key Specifications

Pinout & Package

IRS2540PBF is housed in an industry-standard 8-lead SOIC or PDIP package with exposed pad thermal enhancement (SOIC variant). Pin functions are validated per Infineon PD60293 datasheet Rev. A.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED buck controller applications.

Compared with IRS2541PBF and LM3410XMY/NOPB, the IRS2540PBF uniquely balances 200 V robustness, external MOSFET flexibility, and bootstrap-independent watchdog protection-making it optimal for cost-sensitive, line-powered architectural LED drivers where input voltage stays within 200 V.

Availability

IRS2540PBF is available at Aetrix Electronics and suitable for architectural LED street lighting, industrial high-bay fixtures, and commercial troffer retrofit kits requiring stable component supply and long-term manufacturing continuity.

Supply support for IRS2540PBF 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 global manufacturing and quality certification to ISO 9001 and IATF 16949.

The IRS254x family targets cost-effective, high-reliability LED driver solutions for AC-line-powered constant-current applications-designed to simplify buck topology implementation while ensuring robust fault handling and dimming interoperability.

FAQ

What is the minimum bootstrap capacitor value required for reliable IRS2540PBF operation?

The bootstrap capacitor must retain sufficient charge for ≥20 µs between watchdog pulses. Based on datasheet recommendations and typical leakage, a 100 nF ceramic capacitor with X7R dielectric and ≤2 Ω ESR is specified. Smaller values risk VBS droop below 10 V, causing incomplete HO turn-on and increased conduction losses in the high-side MOSFET.

Can IRS2540PBF drive a synchronous rectifier without external logic?

Yes-the IRS2540PBF integrates a dedicated low-side driver (LO pin) explicitly designed for synchronous rectification. When used with a second N-channel MOSFET connected source-to-COM, LO provides complementary timing to HO with programmable deadtime, eliminating need for external gate logic or timing ICs in buck-derived topologies.

How does the watchdog timer interact with PWM dimming on the ENN pin?

The watchdog timer remains fully active during ENN-driven dimming. When ENN is held high (>2.5 V), regulation halts and LO stays high/HO low-maintaining bootstrap charge. During dimming (PWM on ENN), the watchdog continues monitoring IFB; if open-circuit occurs during ENN low periods, it triggers immediately to preserve VBS integrity.

Is the 500 mV IFB threshold affected by temperature or supply voltage variation?

No-the 500 mV IFB threshold derives from a trimmed on-chip bandgap reference with ±2% accuracy over -25°C to +125°C and VCC = 14 V ±0.25 V. Electrical characteristics tables confirm <±10 mV drift across full operating temperature and supply ranges, enabling stable current regulation without external calibration.