Infineon Technologies IR11672ASTRPBF

Overview

IR11672ASTRPBF from Infineon Technologies (formerly International Rectifier) is a secondary-side synchronous rectifier controller IC for flyback and resonant half-bridge AC-DC converters. It drives N-channel MOSFETs with 10.7 V gate drive clamp, 50 ns turn-off propagation delay, and cycle-by-cycle MOT protection to prevent false triggering under no-load conditions. Used in energy-efficient 0.3 W standby power supplies for LCD/PDP TVs and telecom SMPS.

For engineers reviewing the IR11672ASTRPBF datasheet, IR11672ASTRPBF pinout, IR11672ASTRPBF application, or IR11672ASTRPBF equivalent, key selection criteria include drain-sense voltage range (–3 V to 200 V), gate drive sink current (7 A peak), UVLO thresholds (9.8 V turn-on / 9.0 V turn-off), differential V_DS sensing architecture, and SOIC-8 package compatibility with high-noise SMPS environments.

Technical Context

The IR11672ASTRPBF implements a differential drain-to-source voltage sensing scheme to detect zero-current crossing and control MOSFET conduction timing in real time. Its internal comparator thresholds (V_TH1 = –7 to 0 mV, V_TH2 = –150 to –50 mV) are optimized for accurate polarity detection across varying load and temperature conditions.

A dedicated cycle-by-cycle MOT check circuit monitors MOSFET turn-on timing and disables gate drive if no valid transition is detected-preventing reverse conduction and ensuring compliance with Energy Star and CECP 0.3 W standby requirements. Blanking pulse duration (9–25 µs) and double-pulse suppression enhance noise immunity in high-dV/dt flyback topologies.

Key Specifications

Pinout & Package

IR11672ASTRPBF is housed in an industry-standard 8-lead SOIC package (SOIC-8N), surface-mount compatible with automated assembly and thermally rated for 128 °C/W junction-to-ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6908GJ-Z and UCC24612-2, IR11672ASTRPBF offers superior noise immunity via adjustable blanking and MOT timing, optimal 10.7 V gate clamp for 30–60 V MOSFETs, and direct support for both flyback and resonant half-bridge-making it ideal for high-efficiency, multi-platform AC-DC designs targeting global energy standards.

Availability

IR11672ASTRPBF is available at Aetrix Electronics and suitable for LCD/PDP TV power supplies, telecom SMPS, and AC-DC adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for IR11672ASTRPBF 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 analog and mixed-signal solutions.

The IR11672AS belongs to Infineon's Advanced SmartRectifier™ controller family, engineered specifically for high-efficiency, low-standby-power isolated AC-DC conversion in consumer and telecom infrastructure.

FAQ

What is the maximum recommended switching frequency for IR11672ASTRPBF?

The IR11672ASTRPBF is rated for operation up to 500 kHz, with verified performance in CrCM flyback and resonant half-bridge topologies. At 500 kHz, its 50 ns turn-off propagation delay and 190 ns minimum on-time ensure reliable zero-current switching without false triggering, provided PCB layout minimizes parasitic inductance on VD/VS traces.

How does the MOT pin function in IR11672ASTRPBF?

The MOT pin sets minimum on-time via an external resistor (5–75 kΩ), determining the shortest gate drive pulse width. This prevents spurious turn-on during light-load or no-load conditions by enforcing a timing floor that aligns with expected V_DS transition intervals-critical for maintaining 0.3 W standby compliance in Energy Star-certified designs.

Can IR11672ASTRPBF drive multiple paralleled MOSFETs?

Yes-the IR11672ASTRPBF is designed to drive one or more paralleled N-channel MOSFETs using its +2 A / –7 A peak gate drive capability. Layout best practices require matched gate trace lengths and individual gate resistors to ensure balanced turn-on/turn-off and prevent current hogging across parallel devices.

What is the purpose of the OVT pin on IR11672ASTRPBF?

The OVT pin configures the overvoltage threshold for the V_DS comparator: floating (–14 mV), tied to V_CC (–22 mV), or grounded (–7 mV). This adjusts sensitivity to V_DS overshoot during turn-off, allowing optimization for different MOSFET R_DS(on), transformer leakage, and snubber design-enhancing reliability in noisy high-dV/dt environments.