Infineon Technologies IRS2500STRPBF

Overview

IRS2500STRPBF from Infineon Technologies (formerly International Rectifier) is a transition-mode (critical-conduction mode) boost PFC control IC designed to drive external MOSFETs in AC-DC front-end stages. It delivers 500 mA source/sink gate drive, 60 ns rise/30 ns fall times, 2.5 V internal VBUS reference, and integrated static/dynamic over-voltage protection - enabling high-power-factor (>0.98), low-THD (<5%) regulation for universal-input offline power supplies and LED drivers.

For engineers reviewing the IRS2500STRPBF datasheet, IRS2500STRPBF pinout, IRS2500STRPBF application, or IRS2500STRPBF equivalent, this IC supports precise VBUS-sensed voltage-mode control with cycle-by-cycle current limiting, micro-power startup (<50 µA), and robust noise immunity - critical for reliable PFC pre-regulator design in lighting ballasts and industrial SMPS.

Technical Context

The IRS2500STRPBF implements voltage-mode control with a dedicated VBUS pin sensing the rectified AC line via resistive divider, feeding an internal 2.5 V reference comparator. Its ON-time modulator adjusts switching frequency inversely with line voltage to maintain constant conduction mode across 85–265 VAC inputs.

Protection logic includes leading-edge blanking (320 ns), watchdog timer (400 µs), and dual-stage over-voltage detection: static threshold at 2.7 V on VBUS with 100 mV hysteresis, plus dynamic COMP-pin current sensing (30 µA trip). The IC operates with UVLO thresholds of 12.5 V (rising) and 10.5 V (falling), and integrates a 20 V zener clamp on VCC.

Key Specifications

Pinout & Package

IRS2500STRPBF is housed in an 8-lead SOIC (SO8N) package, RoHS-compliant, MSL2 rated, with standard JEDEC industrial qualification (JESD78 Class I, HBM Class 2).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transition-mode PFC control applications.

Compared with UCC28051DR and FAN6982MY, the IRS2500STRPBF uniquely combines voltage-mode TM control, integrated 2.5 V VBUS reference, ±500 mA gate drive, and dual-stage OVP - making it optimal for compact, high-reliability universal-input PFC stages where THD and fault robustness are prioritized.

Availability

IRS2500STRPBF is available at Aetrix Electronics and suitable for LED lighting drivers, industrial SMPS pre-regulators, electronic ballasts for HID lamps, and appliance power supplies requiring stable component supply and long-term manufacturability.

Supply support for IRS2500STRPBF 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 global semiconductor leader specializing in power management, automotive, and industrial control solutions, with deep heritage in high-voltage analog and mixed-signal ICs.

The IRS2500 product line was developed specifically for cost-effective, high-efficiency transition-mode PFC in universal-input AC-DC converters - targeting lighting, appliance, and industrial power supply markets demanding reliability, low THD, and simplified design.

FAQ

What is the purpose of the VDC pin on the IRS2500STRPBF?

The VDC pin connects to the same resistor divider as VBUS and enables dynamic over-voltage protection. When COMP pin current exceeds 30 µA - indicating rapid bus voltage rise - the internal comparator triggers immediate shutdown. This complements the static 2.7 V VBUS OVP threshold, providing two-tier fault coverage against transient surges and open-loop failures.

Can the IRS2500STRPBF operate without an auxiliary VCC supply?

Yes - its micro-power startup current (<50 µA) allows direct bootstrap from the rectified AC line using a high-value resistor (e.g., 2.2 MΩ) and local 0.1 µF capacitor. Once VCC reaches 12.5 V, the internal zener clamp (20 V) regulates supply, eliminating need for transformer auxiliary winding or dedicated bias supply in most designs.

How does the IRS2500STRPBF achieve low THD in universal-line applications?

By combining voltage-mode control with transition-mode operation, the IC shapes input current to closely follow the sinusoidal AC line voltage. Its precise 2.5 V VBUS reference, low-noise ZX input with blanking, and adaptive ON-time modulation (10–50 µs range) ensure conduction only near voltage zero-crossings - minimizing harmonic distortion to <5% across 85–265 VAC inputs.

Is the IRS2500STRPBF pin-compatible with other industry-standard PFC controllers?

Yes - it is explicitly designed as a drop-in replacement for legacy critical-conduction mode PFC ICs such as the UC3852 and L6561, sharing identical 8-pin SOIC layout and functional pin mapping (COM, VCC, OUT, VBUS, OC, ZX, COMP, VDC). However, its enhanced features - including dynamic OVP and improved noise immunity - require verification of existing PCB layout compatibility before substitution.