Infineon Technologies IR2175SPBF

Overview

IR2175SPBF from Infineon Technologies (formerly International Rectifier) is a monolithic linear current sensing IC with floating high-side channel, designed for motor phase current monitoring in three-phase inverter drives. It features ±260 mV input range, 130 kHz carrier frequency, 20 ppm/°C gain drift, 2 µs overcurrent trip delay, and open-drain PWM/OC outputs compatible with 3.3–15 V logic interfaces.

For engineers reviewing the IR2175SPBF datasheet, IR2175SPBF pinout, IR2175SPBF application, or IR2175SPBF equivalent, key selection criteria include its isolated shunt-based analog-to-PWM conversion, 600 V offset voltage capability, dedicated fast OC signal for IGBT short-circuit protection, and SOIC-8 lead-free packaging suitable for industrial motor control PCB layouts.

Technical Context

The IR2175SPBF integrates a high-voltage floating channel (up to +600 V VS referenced to COM) with monolithic signal conditioning, enabling direct shunt-resistor current sensing on high-side motor phases without optocouplers or isolated amplifiers. Its internal oscillator generates a 130 kHz PWM carrier whose duty cycle linearly tracks VIN+ (±260 mV), with 0.5% linearity error and 155–165 %/V gain.

It delivers two independent open-drain outputs: PO (PWM-encoded current feedback) and OC (active-low overcurrent trip signal with 2 µs propagation delay). Input offset voltage is ±10 mV at TA = 25°C, and gain temperature drift is tightly controlled at 20 ppm/°C (typ.), supporting stable closed-loop current regulation across –40°C to +125°C ambient.

Key Specifications

Pinout & Package

IR2175SPBF is housed in an 8-lead SOIC package (JEDEC MS-012AA), surface-mountable with 1.27 mm pitch, 5.00 × 4.00 mm body, and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ACS712ELCTR-20A-T and INA240A1D, IR2175SPBF uniquely combines high-voltage floating sensing, self-contained PWM encoding, and dedicated fast OC output-enabling simpler, more robust motor current feedback in 400–600 V industrial inverters without added signal conditioning.

Availability

IR2175SPBF is available at Aetrix Electronics and suitable for industrial motor drives, appliance inverter systems, electric power steering modules, and industrial pump drives requiring stable component supply and long-term production continuity.

Supply support for IR2175SPBF 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 core expertise in high-voltage ICs and motor control subsystems.

The IR2175 product line was developed specifically for high-reliability, isolated current sensing in three-phase inverter topologies-targeting applications demanding fast fault response, minimal external components, and operation across wide temperature and voltage ranges.

FAQ

What is the purpose of the VB and VS pins on the IR2175SPBF?

VB supplies power to the high-side floating circuitry, while VS serves as its local return reference node. Together they enable operation with up to 600 V offset relative to COM. A bootstrap capacitor between VB and VS is required when using self-powered high-side operation; an external supply may replace it in continuous-duty designs.

Can the IR2175SPBF be used with a 3.3 V microcontroller?

Yes-the PO and OC outputs are open-drain and fully compatible with 3.3 V logic when pulled up to that voltage. The VCC supply must still be ≥9.5 V (typically 12–15 V) to ensure proper internal operation and OC sink strength, but the output interface voltage is decoupled from VCC.

How does the IR2175SPBF achieve temperature-stable current measurement?

It uses trimmed on-chip resistors and matched transistor pairs to maintain 20 ppm/°C gain drift and ±10 mV input offset. Linearity remains within ±0.5% over temperature, and the 130 kHz carrier frequency's 500 ppm/°C drift can be canceled in firmware by computing duty-cycle ratio rather than absolute on-time.

Is there a recommended minimum shunt resistor value for use with IR2175SPBF?

For optimal SNR and linearity, a 5–10 mΩ shunt is typical, yielding ±1.3–±2.6 V drop at ±260 mV full-scale input. Lower values increase noise susceptibility; higher values risk exceeding the ±260 mV input range during overcurrent events and reduce power efficiency.