Infineon Technologies IR11662STRPBF

Overview

IR11662STRPBF 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 clamped gate drive, 50 ns turn-off propagation delay, and cycle-by-cycle MOT protection, enabling high-efficiency rectification in LCD TV and telecom SMPS.

For engineers reviewing the IR11662STRPBF datasheet, IR11662STRPBF pinout, IR11662STRPBF application, or IR11662STRPBF equivalent, key selection criteria include drain-sense voltage range (–3 V to 200 V), VCC operating window (11.4–18 V), gate drive sink current (4 A peak), anti-bounce logic, and micropower start-up current (100–200 µA).

Technical Context

The IR11662STRPBF implements differential drain-to-source voltage sensing to detect zero-current crossing and trigger MOSFET turn-on/turn-off with timing precision. Its integrated MOT check circuit monitors gate drive activity per switching cycle to disable output under no-load or light-load conditions, preventing reverse conduction.

It features dual-threshold comparators (VTH1 = –7 to 0 mV, VTH2 = –150 to –50 mV) with programmable blanking (8–24 µs), internal UVLO (9.8–11.3 V turn-on, 8.4–9.7 V turn-off), and a 5 Ω pull-up / 1.2 Ω pull-down gate driver stage optimized for fast edge control into 1–10 nF loads.

Key Specifications

Pinout & Package

IR11662STRPBF is housed in an 8-lead SOIC package (SOIC-8N), surface-mount compatible with standard reflow profiles and lead-free assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC24612DR and MP6908GJ-Z, IR11662STRPBF provides superior noise immunity via differential sensing and cycle-by-cycle MOT validation-critical for high-reliability telecom and server SMPS where false triggering causes thermal runaway.

Availability

IR11662STRPBF is available at Aetrix Electronics and suitable for LCD TV power supplies, telecom SMPS, and Energy Star-compliant AC-DC adapters requiring stable component supply, long-term lifecycle support, and lead-free manufacturing compliance.

Supply support for IR11662STRPBF 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 core expertise in high-voltage analog and mixed-signal ICs.

The IR11662 product line was developed specifically for high-efficiency secondary-side synchronous rectification in isolated AC-DC converters, targeting sub-300 mW standby and >92% full-load efficiency in consumer and infrastructure power supplies.

FAQ

What is the purpose of the MOT pin on IR11662STRPBF?

The MOT (Minimum On-Time) pin accepts an external resistor (5–75 kΩ) that sets the minimum gate-on duration to prevent false triggering from noise or transformer leakage spikes. This ensures the MOSFET remains on only for physically meaningful conduction intervals, improving reliability in high-dV/dt environments.

Can IR11662STRPBF drive multiple paralleled MOSFETs?

Yes-its 4 A peak sink current and 1 A source current support driving multiple N-channel MOSFETs in parallel. Layout best practices require matched gate trace lengths and individual 10 Ω gate resistors per device to ensure simultaneous turn-on/turn-off and avoid current imbalance.

How does the OVT pin affect overvoltage protection?

The OVT pin adjusts the comparator threshold for V_DS overvoltage detection: floating = –10.5 mV, tied to V_CC = –15 mV, grounded = –3.5 mV. This allows tuning of the turn-off sensitivity to match MOSFET avalanche rating and transformer leakage characteristics.

Is IR11662STRPBF compatible with resonant half-bridge topologies?

Yes-the IC supports resonant half-bridge operation via its differential V_DS sensing architecture and 500 kHz max switching frequency. Its cycle-by-cycle MOT check and programmable blanking ensure robust gate timing even during variable-frequency LLC transitions and zero-voltage switching events.