Infineon Technologies IRS2541STRPBF

Overview

IRS2541STRPBF from Infineon Technologies is a 600 V high-voltage, high-frequency buck LED regulator control IC with integrated half-bridge driver, ±2% bandgap reference, 140 ns deadtime, and PWM dimming capability. It regulates constant LED current in continuous-mode hysteretic buck topology using IFB feedback (500 mV threshold) and supports open-circuit protection via ENN pin. Used in offline LED drivers for commercial lighting.

For engineers reviewing the IRS2541STRPBF datasheet, IRS2541STRPBF pinout, IRS2541STRPBF application, or IRS2541STRPBF equivalent, key selection criteria include 600 V VS rating, 500 kHz max switching frequency, bootstrap-driven high-side gate drive, watchdog timer–enabled open-circuit recovery, and 8-pin SOIC thermal performance (R_THJA = 200 °C/W).

Technical Context

The IRS2541STRPBF implements a time-delayed hysteretic current regulation loop: HO turns off when IFB ≥ 500 mV (after 180 ns delay), LO turns on after 140 ns deadtime, then HO re-enables when IFB ≤ 500 mV (after 320 ns delay). This free-running architecture eliminates external frequency-setting components.

Its integrated 15.6 V zener clamp on VCC limits supply voltage stress, while the 20 µs watchdog timer forces periodic LO/HO toggling during open-circuit conditions to sustain bootstrap capacitor charge-critical for maintaining high-side MOSFET gate drive integrity above 400 V bus voltages.

Key Specifications

Pinout & Package

IRS2541STRPBF is housed in an 8-pin SOIC package (body width 3.9 mm, thermal resistance R_THJA = 200 °C/W under board-mounted, still-air conditions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS2540STRPBF and MPQ3367GR-AEC1, IRS2541STRPBF uniquely delivers 600 V floating operation with discrete MOSFET flexibility and watchdog-enabled fault resilience-making it optimal for industrial/commercial AC-line-connected LED drivers where reliability and bus voltage headroom are critical.

Availability

IRS2541STRPBF is available at Aetrix Electronics and suitable for commercial indoor lighting, industrial high-bay fixtures, and outdoor street lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IRS2541STRPBF 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 control solutions.

The IRS254x family targets cost-sensitive, high-reliability offline LED drivers-designed specifically for buck-based constant-current regulation in mains-connected lighting with minimal external components and inherent fault tolerance.

FAQ

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

A minimum 100 nF ceramic capacitor is recommended for C_BOOT to maintain sufficient charge over the 20 µs watchdog interval. Smaller values risk V_B droop below 10 V, causing incomplete HO turn-on and increased conduction losses. X7R dielectric with 25 V rating ensures stability across temperature and voltage bias.

Can IRS2541STRPBF drive a P-channel high-side MOSFET?

No-IRS2541STRPBF's HO output is designed exclusively for N-channel high-side MOSFETs requiring bootstrap gate drive. Its internal level shifter and 140 ns deadtime are optimized for N-channel half-bridge configurations. Driving P-channel devices would require external level translation and invalidate timing guarantees.

How does the ENN pin behave during undervoltage lockout (UVLO)?

During V_CC UVLO (V_CC < 6.5 V), the ENN pin is ignored-the IC remains disabled regardless of ENN state. Only after V_CC exceeds 8.0 V does ENN become active. This prevents erratic dimming or false enable signals during power-up or brownout conditions.

Is external RC compensation needed for current-loop stability?

No-IRS2541STRPBF uses time-delayed hysteretic control, which is inherently stable without external compensation. The control loop has no phase margin concerns or gain-bandwidth tradeoffs. Stability depends solely on proper layout of IFB trace (short, shielded, away from switching nodes) and RCS placement adjacent to COM.