Infineon Technologies IR1169STRPBF

Overview

IR1169STRPBF from Infineon Technologies (formerly International Rectifier) is a secondary-side synchronous rectifier controller IC for isolated DC-DC converters, supporting Flyback, Forward, and Half-bridge topologies in both CCM and DCM modes. It features 200 V drain-sense capability, 50 ns turn-off propagation delay, 4 A peak sink gate drive current, 10.7 V internally clamped gate output, and cycle-by-cycle MOT fault detection - enabling high-efficiency, low-noise SR control in telecom and server SMPS.

For engineers reviewing the IR1169STRPBF datasheet, IR1169STRPBF pinout, IR1169STRPBF application, or IR1169STRPBF equivalent, key selection criteria include its differential V_DS-sensing architecture, SYNC-enabled CCM operation, UVLO with 10.4 V turn-on threshold, anti-bounce logic, and compatibility with <0.3 W standby power designs per Energy Star and CECP requirements.

Technical Context

The IR1169STRPBF implements a dual-threshold comparator (V_TH1 = –3.5 mV, V_TH2 = –230 mV) for precise zero-current crossing detection across wide V_D range (–3 V to 200 V), combined with a 9–25 µs programmable blanking window via R_MOT (5–75 kΩ). Its gate driver delivers 1 A source / 4 A sink peak current with 70 ns turn-on and 50 ns turn-off propagation delays referenced to V_DS transitions.

Operation is enabled only when V_CC exceeds 10.4 V (with 1.1 V hysteresis), and the IC enters sleep mode (I_SLEEP = 150–200 µA) when EN is low. The MOT pin monitors MOSFET conduction time to prevent false triggering, while SYNC input allows external forced turn-off during CCM - all implemented in a rugged 8-lead SOIC package rated for T_J = –40°C to +125°C.

Key Specifications

Pinout & Package

IR1169STRPBF is housed in an industry-standard 8-lead SOIC (SOIC-8N) package with standard thermal pad layout and lead pitch of 1.27 mm. Pin 1 is marked with a dot; pins are numbered counterclockwise.

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 UCC24612-2QDR, IR1169STRPBF uniquely combines 200 V drain-sense tolerance, user-programmable blanking, and dedicated SYNC input - making it optimal for high-reliability, multi-topology telecom and server SMPS where noise immunity and CCM interoperability are critical.

Availability

IR1169STRPBF is available at Aetrix Electronics and suitable for telecom SMPS, server SMPS, and AC-DC adapters requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for IR1169STRPBF 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 headquartered in Munich, Germany, specializing in power management, automotive, and industrial control ICs with emphasis on energy efficiency and system reliability.

The IR1169STRPBF belongs to Infineon's Advanced SmartRectifier™ family, engineered specifically for high-efficiency secondary-side synchronous rectification in isolated AC-DC and DC-DC converters targeting <0.3 W standby power and >95% full-load efficiency.

FAQ

What is the maximum recommended switching frequency for IR1169STRPBF?

The IR1169STRPBF is rated for operation up to 500 kHz, validated across Flyback, Forward, and Half-bridge topologies. At this frequency, its 50 ns turn-off propagation delay and 70 ns turn-on delay ensure minimal dead-time uncertainty, while the 9–25 µs blanking window (set by R_MOT) maintains noise immunity without compromising dynamic response in high-dV/dt environments.

How does the MOT pin function in IR1169STRPBF?

The MOT pin connects to an external resistor (5–75 kΩ) that sets both the blanking window duration (9–25 µs) and the minimum MOSFET on-time. This circuit prevents false triggering from voltage spikes by enforcing a mandatory conduction period before re-enabling the gate driver - a hardware-based cycle-by-cycle fault check independent of SYNC or V_DS sensing timing.

Can IR1169STRPBF drive multiple paralleled MOSFETs?

Yes - the IR1169STRPBF gate driver delivers 4 A peak sink current and 1 A peak source current, sufficient to drive multiple paralleled N-channel MOSFETs (e.g., two 30 V/80 A devices) with controlled rise/fall times. Its 10.7 V gate clamp ensures safe gate voltage under varying V_CC (11–19 V), and the push-pull output eliminates need for external pull-down resistors in high-density layouts.

What is the purpose of the SYNC pin, and how should it be interfaced?

The SYNC pin is an active-low input used to force immediate MOSFET turn-off during CCM operation, typically driven by the primary-side controller's PWM falling edge. It requires a ≥2 kΩ series resistor to tolerate –0.7 V negative pulses. When asserted, SYNC overrides V_DS sensing, ensuring precise timing alignment between primary and secondary switches in high-frequency resonant or phase-shifted topologies.