Infineon Technologies IR2175S

Overview

IR2175S from Infineon Technologies is a monolithic linear current sensing IC for motor phase current monitoring in 3-phase inverter drives. It features ±260mV input range, 130kHz carrier frequency, 2µs overcurrent trip delay, 600V floating channel capability, and direct digital PWM output - enabling shunt-based current feedback without external ADC in IGBT gate driver circuits.

For engineers reviewing the IR2175S datasheet, IR2175S pinout, IR2175S application, or IR2175S equivalent, this device supports high-noise industrial motor control designs requiring precise analog-to-PWM conversion, fast fault response, and bootstrap-compatible high-side isolation up to 600V.

Technical Context

The IR2175S integrates a high-voltage floating channel with proprietary isolation technology to process shunt voltage signals across VS–VIN+ with ±260mV full-scale range and 20ppm/°C gain drift. Its internal oscillator generates a fixed 130kHz PWM carrier whose duty cycle linearly tracks input voltage.

It delivers two independent open-drain outputs: PO (PWM) referenced to COM, and OC (overcurrent trip, active-low) with 2µs propagation delay and 1.5µs minimum pulse width - both compatible with 3.3V–15V logic interfaces and designed for direct connection to microcontroller GPIO or FPGA inputs.

Key Specifications

Pinout & Package

IR2175S is housed in an 8-lead SOIC package (JEDEC MS-012AA), surface-mountable with 1.27 mm pitch, 5.00 mm × 4.00 mm body, and thermal resistance R_thJA = 200°C/W.

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, the IR2175S uniquely integrates high-voltage floating sensing, self-timed PWM conversion, and hardware-fast OC signaling - reducing system latency and component count in motor drive inverters.

Availability

IR2175S is available at Aetrix Electronics and suitable for industrial motor drives, appliance inverter systems, and IGBT-based UPS modules requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for IR2175S 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 German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs.

The IR2175S belongs to Infineon's high-voltage gate driver and current sensing product line, engineered specifically for cost-sensitive, high-reliability motor control applications demanding integrated isolation and fast fault response.

FAQ

What is the purpose of the N.C. pin on the IR2175S?

The N.C. (No Connection) pin is electrically unconnected and must remain unattached in PCB layout. It serves only as a mechanical placeholder to maintain pin spacing and package symmetry in the 8-lead SOIC footprint. Connecting it risks internal damage or unpredictable behavior due to unintended coupling with high-voltage nodes like VB or VS.

Can the IR2175S be used with a 3.3 V microcontroller?

Yes - both PO and OC outputs are open-drain and fully compatible with 3.3 V logic. Use a 3.3 V pull-up resistor (typically 4.7 kΩ) on each output. The internal output transistors can sink ≥10 mA, ensuring clean low-level assertion even under capacitive loading typical of MCU GPIO traces.

How does the IR2175S achieve 600 V floating operation without external isolation?

It uses Infineon's proprietary high-voltage level-shifting technology fabricated in a specialized BCD-on-SOI process. This allows internal circuitry referenced to VS to operate reliably at potentials up to 600 V above COM, eliminating the need for optocouplers or isolated DC–DC supplies in the signal path.

Is the carrier frequency adjustable?

No - the 130 kHz carrier frequency is fixed by an internal oscillator and not user-adjustable. However, system-level current accuracy can be maintained over temperature by computing duty-cycle ratio (on-time / period) rather than absolute duty, canceling out matched frequency and gain drifts as recommended in Application Hint on page 4 of the datasheet.