Infineon Technologies IR11682SPBF

Overview

IR11682SPBF 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 IR11682SPBF datasheet, IR11682SPBF pinout, IR11682SPBF application, or IR11682SPBF equivalent, key selection criteria include differential V_DS sensing accuracy, anti-shoot-through logic timing, gate drive clamp voltage (10.7V), UVLO thresholds (7.0–8.5V), and SOIC-8 thermal performance (R_θJA = 128°C/W).

Technical Context

The IR11682SPBF implements dual independent high-speed comparator-based control with differential drain-to-source voltage sensing per channel, enabling zero-current-transition (ZCT) switching detection. Its anti-bounce logic and double-pulse suppression ensure noise-immune operation in variable-frequency resonant converters up to 400kHz.

Each channel integrates a dedicated one-shot blanking circuit (8–25µs), minimum on-time enforcement (600–1100ns), and independent UVLO with 0.5V hysteresis. The MOT check circuit monitors load condition per cycle to disable gate outputs under no-load to prevent reverse conduction.

Key Specifications

Pinout & Package

IR11682SPBF is housed in an 8-lead SOIC package (SOIC-8N, MSL2, RoHS-compliant), with exposed pad not electrically connected. Thermal resistance R_θJA = 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, IR11682SPBF uniquely delivers 200V sensing, dual-channel anti-shoot-through logic, and cycle-by-cycle MOT disable-making it the only option qualified for high-voltage, high-reliability resonant adapters and industrial SMPS where single-point failure modes must be eliminated.

Availability

IR11682SPBF 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 (JEDEC Industrial Level, MSL2).

Supply support for IR11682SPBF 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 since 2015) was a pioneer in power semiconductor innovation, specializing in high-efficiency power conversion ICs and discrete devices for industrial, computing, and consumer markets.

The SmartRectifier™ product line-including IR11682SPBF-was engineered specifically for zero-voltage-switching (ZVS) and zero-current-transition (ZCT) resonant topologies, targeting >95% efficiency in compact, thermally constrained AC-DC systems.

FAQ

What is the maximum recommended switching frequency for IR11682SPBF?

The IR11682SPBF is rated for up to 400kHz operation per the datasheet's Recommended Operating Conditions. This limit accounts for internal propagation delays (80ns t_Doff), blanking window timing (8–25µs), and gate drive strength (4A sink). Operation beyond 400kHz risks missed ZCT detection and increased shoot-through risk due to timing margin erosion.

Does IR11682SPBF require external components for basic operation?

Yes-minimum external components include two gate resistors (R_g1, R_g2), bypass capacitor on V_CC, and optional RC filters on V_D/V_S inputs for noisy layouts. No external bootstrap capacitors, level shifters, or isolated supplies are needed, enabling minimal BOM count versus competing solutions.

How does the MOT protection circuit function in practice?

The MOT (Minimum On-Time) check circuit monitors gate drive activity and V_DS transitions per switching cycle. When no valid turn-on event occurs over multiple cycles-indicating no-load or light-load-the IC disables both GATE1 and GATE2 outputs, forcing SR MOSFETs fully off to block reverse current and eliminate body-diode conduction loss.

Is IR11682SPBF compatible with paralleled MOSFETs per channel?

Yes-the 4A peak sink current and 1A source current per gate driver are specified for C_LOAD up to 4.7nF, supporting direct drive of multiple paralleled N-MOSFETs (e.g., two 100nΩ FETs with total C_iss ≈ 3.2nF). Layout must maintain matched gate loop inductance to avoid current imbalance.