Infineon Technologies IR2172PBF

Overview

IR2172PBF from Infineon Technologies (formerly International Rectifier) is a monolithic high-voltage linear current sensing IC with floating channel capability up to +600V, 40kHz carrier frequency, ±260mV input voltage range, 1mA quiescent V_BS supply current, and dedicated open-drain overcurrent (OC) output - designed for real-time IGBT phase-current monitoring in three-phase motor drives.

For engineers reviewing the IR2172PBF datasheet, IR2172PBF pinout, IR2172PBF application, or IR2172PBF equivalent, key selection considerations include its integrated PWM output eliminating external ADC, fast 1.5µs OC trip response, ±20ppm/°C gain drift, and dual-package availability (SOIC-8/PDIP-8) for industrial motor control layout flexibility.

Technical Context

The IR2172PBF implements a high-bandwidth analog-to-digital conversion architecture using a fixed-frequency 40kHz triangle-wave carrier to generate duty-cycle-modulated PWM output proportional to shunt voltage. Its floating high-side channel operates with up to 600V offset between VS and COM, enabling direct connection to IGBT emitter legs without level-shifting circuitry.

It features independent open-drain OC output triggered by input differential exceeding ±260mV, with 1.5µs propagation delay and 1µs minimum pulse width. Input offset voltage is ±10mV at 25°C, and gain temperature drift is tightly specified at 20ppm/°C (typ.), supporting stable current feedback across -40°C to +125°C ambient.

Key Specifications

Pinout & Package

IR2172PBF is available in two industry-standard packages: 8-lead PDIP (JEDEC MS-001AB) and 8-lead SOIC (JEDEC MS-012AA), both with same pinout configuration and creepage/clearance suitable for reinforced isolation in motor drive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear current sensing applications.

Compared with IR2172PBF, IR2175PBF trades OC functionality for higher bandwidth and smaller footprint, while IR22771PBF adds LDO regulation and tighter input range at the cost of reduced shunt voltage headroom - making IR2172PBF optimal where hardware-level fast OC response and wide input range are critical.

Availability

IR2172PBF is available at Aetrix Electronics and suitable for industrial AC inverters, brushless DC motor controllers, IGBT-based servo amplifiers, and solar MPPT inverters requiring stable component supply with long-term manufacturing continuity.

Supply support for IR2172PBF 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 deep expertise in high-voltage IC design and motor control systems.

The IR2172PBF belongs to Infineon's legacy IR217x family of high-voltage current sensors, engineered specifically for robust, isolated current feedback in ruggedized motor drive and inverter applications.

FAQ

What is the function of the OC pin on IR2172PBF?

The OC (Overcurrent) pin is an active-low open-drain output that asserts within 1.5µs (typ.) when the absolute value of VIN+–VIN− exceeds ±260mV. It provides hardware-level fault signaling independent of the PWM output, enabling immediate IGBT/MOSFET gate shutdown without processor intervention - critical for short-circuit protection in motor drives.

Can IR2172PBF operate with a 3.3V logic supply?

Yes - the OC and PO outputs are open-drain and compatible with 3.3V pull-up resistors. However, VCC must be supplied within 9.5–20V per datasheet specifications; the internal logic and drivers require this higher rail. External level-shifting is unnecessary, but VCC cannot be reduced to 3.3V.

How does IR2172PBF achieve high common-mode noise immunity?

It uses Infineon's proprietary high-voltage isolation technology with differential input structure and matched internal paths, achieving >50V/ns dV/dt immunity. The floating VB/VS domain decouples high-side switching noise from the low-side logic, and input overvoltage clamping prevents latch-up during IGBT shoot-through events.

Is IR2172PBF pin-compatible with IR2171PBF?

Yes - both share identical 8-pin SOIC and PDIP footprints and pin assignments. The only functional difference is that IR2171PBF has NC (no connect) on pin 7, whereas IR2172PBF uses pin 7 as the OC output. Board designs can use either part, but OC functionality requires IR2172PBF and appropriate pull-up routing.