Infineon Technologies IRS2541SPBF

Overview

IRS2541SPBF from Infineon Technologies is a 600 V high-voltage, time-delayed hysteretic buck LED current regulator IC with integrated high- and low-side gate drivers, ±2% internal bandgap reference (500 mV), 140 ns deadtime, and 500 kHz max switching frequency. It regulates constant LED current in isolated or non-isolated buck topologies using feedback at the IFB pin and supports PWM dimming via the ENN pin.

For engineers reviewing the IRS2541SPBF datasheet, IRS2541SPBF pinout, IRS2541SPBF application, or IRS2541SPBF equivalent, key selection criteria include its 600 V VS rating, bootstrap-driven high-side operation, watchdog timer–enabled open-circuit protection, and direct average-current regulation without external oscillator components.

Technical Context

The IRS2541SPBF implements a free-running, time-delayed hysteretic control architecture that compares IFB voltage (threshold 455–540 mV) against an on-chip 500 mV bandgap reference to regulate average LED current without fixed-frequency timing components. Its dual-output driver delivers HO and LO signals with 140 ns programmable deadtime to prevent shoot-through in high-side-switched buck converters.

Operation relies on a bootstrap floating supply (VB/VS up to 600 V) for the high-side driver and includes a 20 µs watchdog timer that forces periodic LO turn-on to replenish CBOOT charge during open-circuit conditions - eliminating need for auxiliary bias winding or charge pump circuits.

Key Specifications

Pinout & Package

IRS2541SPBF is housed in an 8-pin SOIC package (body width 3.9 mm, lead pitch 1.27 mm) with gull-wing leads and RoHS-compliant matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS2540SPBF, IRS2541SPBF enables universal-input LED drivers without derating, while MPQ3367GR-A trades integration for higher frequency and external flexibility - making IRS2541SPBF optimal for cost-sensitive, high-voltage, single-chip buck LED solutions.

Availability

IRS2541SPBF is available at Aetrix Electronics and suitable for street lighting, industrial LED panels, architectural accent lighting, and UV-C disinfection modules requiring stable component supply and long-term production continuity.

Supply support for IRS2541SPBF 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 leadership in high-voltage gate drivers and LED lighting solutions.

The IRS254x product line targets cost-optimized, high-reliability LED current regulators for mains-connected lighting - emphasizing integration, fault resilience, and simplified system-level design.

FAQ

What is the minimum bootstrap capacitor value required for reliable IRS2541SPBF operation?

The bootstrap capacitor must retain sufficient charge for at least 20 µs between watchdog pulses. With typical leakage and load, a 100 nF X7R ceramic capacitor is recommended. Smaller values risk VBS collapse during open-circuit conditions, causing HO output failure and potential MOSFET overheating. Layout parasitics and diode reverse recovery also affect minimum sizing - refer to IRF Design Tip DT98-2 for empirical validation.

Can IRS2541SPBF drive a synchronous rectifier in continuous conduction mode?

Yes - the integrated LO driver supports synchronous rectification when paired with a low-side N-channel MOSFET. The 140 ns deadtime prevents shoot-through, and matched 320 ns turn-on delays ensure precise timing alignment. However, CCM operation requires careful inductor sizing to maintain >10% minimum duty cycle at lowest input voltage, otherwise discontinuous mode behavior may trigger unintended watchdog activation.

How does the IRS2541SPBF handle overvoltage on the IFB pin?

The IFB pin has absolute maximum rating of VCC + 0.3 V and is not internally clamped. Exceeding this - for example, due to RCS resistor mismatch or layout coupling - risks permanent damage. Designers must limit IFB node impedance, use short traces, and avoid placing high-dv/dt nodes nearby. No internal protection exists beyond the absolute rating; external Zener or TVS is recommended if transient overvoltage is possible.

Is the 500 kHz maximum frequency achievable across the full operating temperature range?

No - the 500 kHz specification is valid only at TA = 25°C. At TJ = 125°C, maximum practical frequency drops to ~380 kHz due to increased propagation delays and reduced driver slew rates. For designs requiring 500 kHz at high ambient temperatures, thermal derating of power dissipation and verification of HO/LO rise/fall times (tr ≤ 120 ns, tf ≤ 50 ns) under worst-case conditions are mandatory.