Infineon Technologies IR11682STRPBF

Overview

IR11682STRPBF from International Rectifier is a dual secondary-side synchronous rectifier driver IC for LLC and resonant half-bridge topologies, featuring 200V drain-sense capability, 80ns turn-off propagation delay, 4A peak sink current per channel, and cycle-by-cycle MOT protection. It drives two N-channel MOSFETs to replace Schottky diodes in high-efficiency AC-DC adapters and LCD TV power supplies.

For engineers reviewing the IR11682STRPBF datasheet, IR11682STRPBF pinout, IR11682STRPBF application, or IR11682STRPBF equivalent, key selection criteria include differential V_DS sensing accuracy, anti-shoot-through logic timing, gate drive clamp voltage (10.7V), UVLO thresholds (7.6V turn-on / 7.0V turn-off), and SOIC-8 thermal resistance (128°C/W).

Technical Context

The IR11682STRPBF implements dual independent high-speed comparator channels with programmable blanking (8–25µs) and hysteresis (141mV) to detect zero-current crossing via differential drain-to-source voltage sensing. Each channel includes anti-shoot-through logic and a one-shot circuit that enforces minimum on-time (600–1100ns) and prevents false triggering under no-load conditions.

Its gate driver delivers 1A source / 4A sink peak current with 10ns/5ns rise/fall times into 1nF load, and clamps output high voltage at 10.7V (typ.) while maintaining 0.5V low-level drive. The IC operates across 8.6–18V V_CC, supports up to 400kHz switching, and integrates micropower start-up (140µA) and ultra-low quiescent current (2.6–4.3mA).

Key Specifications

Pinout & Package

IR11682STRPBF is housed in an 8-lead SOIC package (SOIC-8N, MSL2, RoHS-compliant), with exposed pad not electrically connected. Thermal resistance θ_JA = 128°C/W under standard board-mount conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual synchronous rectifier driver applications.

Compared with UCC24612DR and MP6908GJ-Z, IR11682STRPBF uniquely combines 200V sensing, dual-channel anti-shoot-through, and MOT-based no-load shutdown-making it the only choice for robust, high-voltage, dual-SR LLC designs requiring zero auxiliary components.

Availability

IR11682STRPBF is available at Aetrix Electronics and suitable for AC-DC adapters, LCD TV power supplies, and telecom SMPS requiring stable component supply, long-term lifecycle support, and industrial-grade qualification.

Supply support for IR11682STRPBF 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

International Rectifier (now part of Infineon Technologies) is a pioneer in power semiconductor innovation, specializing in high-efficiency analog and mixed-signal power ICs for energy conversion systems.

The SmartRectifier™ product line was developed specifically for secondary-side synchronous rectification in resonant topologies, emphasizing noise immunity, zero-current detection fidelity, and integration to reduce bill-of-materials in high-density power supplies.

FAQ

What is the maximum recommended switching frequency for IR11682STRPBF?

The IR11682STRPBF is characterized and specified up to 400kHz, with propagation delays (80ns turn-off, 100ns turn-on) and blanking (8–25µs) optimized for stable operation in variable-frequency LLC converters. Operation beyond 400kHz may compromise zero-current detection margin and increase false-trigger risk due to reduced timing window.

Does IR11682STRPBF require an external bootstrap capacitor?

No. IR11682STRPBF uses direct sensing and self-powered gate drive architecture - it draws supply current solely from the VCC pin and does not rely on bootstrap or charge-pump circuits. This eliminates external capacitors and simplifies PCB layout in isolated secondary-side applications.

How does the MOT protection circuit function during light-load conditions?

The MOT (Minimum On-Time) check monitors gate drive pulse duration each cycle. If detected on-time falls below 600ns (min), the IC interprets this as no-load or light-load and disables subsequent gate outputs until valid ZCS events resume. This prevents negative current flow through SR MOSFET body diodes and reduces standby power to <10mW.

Can IR11682STRPBF drive paralleled MOSFETs on a single channel?

Yes. Each channel delivers 4A peak sink current and supports gate loads up to 4.7nF, enabling reliable drive of two or more paralleled N-channel MOSFETs per channel. Layout best practices (matched gate traces, Kelvin source connections) are required to maintain simultaneous turn-off and avoid current imbalance.