Infineon Technologies 111-4095PBF

Overview

111-4095PBF from International Rectifier is a secondary-side synchronous rectifier controller IC for flyback converters, supporting DCM/CrCM/CCM topologies with 200 V drain-sense capability, 500 kHz max switching frequency, 40 ns turn-off propagation delay, and 7 A peak sink drive current. It drives N-channel MOSFETs to replace Schottky diodes in high-efficiency AC-DC adapters.

For engineers reviewing the 111-4095PBF datasheet, 111-4095PBF pinout, 111-4095PBF application, or 111-4095PBF equivalent, key selection criteria include gate drive clamp voltage (10.7 V or 14.5 V), differential drain-voltage sensing, anti-bounce logic, UVLO thresholds (9.0 V turn-on / 8.7 V turn-off), and SOIC-8 package compatibility with thermal resistance of 128 °C/W.

Technical Context

The IR1167(A,B)S implements zero-current-transition detection via differential V_DS sensing across the synchronous rectifier MOSFET, using dual comparators with programmable blanking (9–25 µs) and double-pulse suppression to reject noise in noisy flyback environments. Its internal regulator supplies stable gate drive from 11.3–20 V V_CC, with micropower start-up (100–200 µA) and ultra-low sleep current (150–200 µA).

It features two variants: IR1167A clamps gate voltage at 10.7 V (typ.), while IR1167B clamps at 14.5 V (typ.), enabling optimization for different MOSFET threshold voltages and R_DS(on) trade-offs in 1 W standby-compliant designs. Minimum on-time is 190–290 ns (adjustable via R_MOT).

Key Specifications

Pinout & Package

111-4095PBF is housed in an 8-lead SOIC package (SOIC-8N) with standard JEDEC MS-012AC footprint, 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 control applications.

Compared with UCC24612-2 and MP6908A, 111-4095PBF offers superior noise immunity via configurable blanking and dual comparator architecture, making it preferred for industrial-grade flyback designs where EMI resilience and multi-mode (DCM/CrCM/CCM) flexibility are critical.

Availability

111-4095PBF is available at Aetrix Electronics and suitable for AC-DC adapters, ATX SMPS, and telecom SMPS requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 111-4095PBF 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) was a pioneer in power semiconductor innovation, specializing in high-efficiency power conversion solutions for industrial, computing, and consumer markets.

The IR1167(A,B)S product line was engineered specifically for high-frequency flyback synchronous rectification, targeting Energy Star Tier 2 and CECP 1 W standby compliance in compact, thermally constrained AC-DC systems.

FAQ

What topology does 111-4095PBF support?

111-4095PBF supports discontinuous conduction mode (DCM), critical conduction mode (CrCM), and continuous conduction mode (CCM) flyback topologies. It uses differential drain-to-source voltage sensing to detect zero-current transitions and control N-channel MOSFETs as synchronous rectifiers, regardless of operating mode or variable-frequency control schemes.

How does the RMOT pin affect timing behavior?

The RMOT pin sets the minimum on-time via an external resistor, ranging from 190 ns (5 kΩ) to 2.4 µs (75 kΩ) depending on V_CC and resistor value. This prevents premature turn-off during light-load DCM operation and avoids shoot-through in paralleled MOSFET configurations by enforcing a guaranteed conduction window.

Is 111-4095PBF compatible with both IR1167A and IR1167B variants?

Yes - 111-4095PBF is the industry-standard distributor designation covering both IR1167AS and IR1167BS variants. The 'A' version provides 10.7 V gate drive clamp; the 'B' version provides 14.5 V. Both share identical pinout, timing, and protection features, differing only in clamp voltage and quiescent current specs.

What is the role of the OVT pin?

The OVT (Overvoltage Threshold) pin allows external configuration of the V_DS-based overvoltage protection threshold. When V_DS exceeds the programmed limit, the controller disables gate drive to protect the MOSFET from avalanche stress during output short-circuit or transformer saturation events, enhancing system reliability without additional protection ICs.