Infineon Technologies IR11672ASPBF

Overview

IR11672ASPBF from Infineon Technologies (formerly International Rectifier) is a secondary-side synchronous rectifier controller IC for flyback and resonant half-bridge AC-DC converters, featuring 200 V drain-sense capability, 50 ns turn-off propagation delay, 7 A peak sink drive current, 10.7 V gate drive clamp, and cycle-by-cycle MOT protection. It drives N-channel MOSFETs to replace Schottky diodes in high-efficiency adapters and server SMPS.

For engineers reviewing the IR11672ASPBF datasheet, IR11672ASPBF pinout, IR11672ASPBF application, or IR11672ASPBF equivalent, key selection criteria include differential V_DS sensing accuracy, anti-bounce logic robustness, UVLO thresholds (11.3 V turn-on / 9.0 V turn-off), 500 kHz max switching support, and SOIC-8 thermal performance (R_θJA = 128 °C/W).

Technical Context

This IC implements zero-current-transition (ZCT) detection via differential drain-to-source voltage sensing across the synchronous rectifier MOSFET, enabling precise turn-on/turn-off timing without auxiliary windings. Its proprietary blanking scheme and double-pulse suppression ensure noise immunity during boundary conduction mode (CrCM) and discontinuous conduction mode (DCM) operation.

The integrated cycle-by-cycle MOT (Minimum On Time) check circuit monitors gate drive timing to detect no-load conditions and disable output to prevent reverse conduction. Gate driver output is internally clamped at 10.7 V with ±2 A / −7 A peak sourcing/sinking capability and sub-100 ns propagation delays under defined overdrive conditions.

Key Specifications

Pinout & Package

IR11672ASPBF is housed in an 8-lead SOIC package (SOIC-8N, 150 mil width) with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Thermal resistance R_θJA = 128 °C/W under board-mounted, still-air conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar secondary-side synchronous rectifier controller applications.

Compared with NCP4306DR2G and AP4313KTR-G1, IR11672ASPBF offers superior 200 V drain tolerance, faster 50 ns turn-off, and autonomous MOT-based no-load shutdown-critical for high-voltage, high-frequency, and ultra-low-standby designs.

Availability

IR11672ASPBF is available at Aetrix Electronics and suitable for LCD TV power supplies, telecom SMPS, AC-DC adapters, and server SMPS requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IR11672ASPBF 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 legacy expertise from International Rectifier's advanced power IC portfolio.

The IR11672A product line was developed specifically for high-efficiency secondary-side synchronous rectification in isolated AC-DC converters targeting Energy Star, CECP, and 80 PLUS Titanium compliance.

FAQ

What is the purpose of the MOT pin on IR11672ASPBF?

The MOT (Minimum On Time) pin sets the shortest allowable gate-on duration via an external resistor (5–75 kΩ), preventing false triggering during light-load or no-load conditions. This enables automatic gate drive disable when MOSFET conduction would cause reverse current, directly supporting <0.3 W standby compliance.

How does IR11672ASPBF achieve noise immunity in high-dV/dt environments?

It uses a programmable blanking pulse (9–25 µs) after each V_DS transition and double-pulse suppression logic to reject ringing-induced false triggers. The differential V_DS sensing architecture further rejects common-mode noise, ensuring reliable operation up to 500 kHz in CrCM/DCM flyback converters.

Can IR11672ASPBF drive multiple paralleled MOSFETs?

Yes-its 7 A peak sink and 2 A source gate drive capability, combined with 10.7 V clamped output, supports driving multiple paralleled N-channel MOSFETs. Layout best practices require matched gate trace lengths and Kelvin source connections to maintain simultaneous switching and avoid current imbalance.

What is the function of the OVT pin?

The OVT (Overvoltage Threshold) pin adjusts the V_DS overvoltage detection threshold: floating = −9.5 mV, tied to V_CC = −18 mV, grounded = −7 mV. This allows fine-tuning of the turn-off point to accommodate MOSFET R_DS(on) variation and layout parasitics while maintaining ZCT accuracy.