Infineon Technologies IR2175

Overview

IR2175 from Infineon Technologies (formerly International Rectifier) 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, 20ppm/°C gain drift, 2µs overcurrent trip delay, and floating high-side operation up to +600V. It delivers discrete PWM output directly to MCU timers for closed-loop current control in BLDC and PMSM drives.

For engineers reviewing the IR2175 datasheet, IR2175 pinout, IR2175 application, or IR2175 equivalent, key selection considerations include its shunt-based analog-to-PWM conversion, independent OC signal with open-drain logic, bootstrap-compatible high-side supply (VB/VS), and thermal stability of gain and carrier frequency across -40°C to +125°C ambient.

Technical Context

The IR2175 integrates a high-voltage floating channel with precision op-amp front-end, modulator, and digital PWM generator - all monolithically fabricated on a single die. Its input stage accepts differential voltage across an external shunt (VIN+ to VS), with offset voltage ≤±10mV and linearity error ≤0.5%.

It generates a fixed-frequency (100–180kHz typ.) PWM output whose duty cycle linearly tracks input voltage (155–165%/V gain), while simultaneously asserting an active-low OC signal when |VIN+| exceeds ±260mV. Propagation delay from input to OC is 2µs typical, enabling fast IGBT short-circuit protection.

Key Specifications

Pinout & Package

Available in 8-lead PDIP (IR2175) and 8-lead SOIC (IR2175S) packages per JEDEC MS-001AB and MS-012AA outlines respectively. Both are lead-free (PbF) compliant and rated for industrial temperature range (-40°C to +125°C).

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 IR2175 uniquely combines high-voltage floating sensing, monolithic PWM generation, and hardware-fast OC in one package - eliminating external signal conditioning and reducing fault latency by >10× in motor drive protection schemes.

Availability

IR2175 is available at Aetrix Electronics and suitable for industrial BLDC drives, appliance inverter modules, PMSM traction inverters, and industrial servo amplifiers requiring stable component supply and long-term production continuity.

Supply support for IR2175 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 IC design and motor control integration.

The IR2175 belongs to Infineon's legacy IR high-voltage analog interface product line, engineered specifically for cost-sensitive, high-reliability motor drive current sensing where bootstrap-compatible floating operation and deterministic fault response are essential.

FAQ

What is the purpose of the VS pin on the IR2175?

The VS pin serves as the floating reference node for the VIN+ input and the high-side circuitry. It tracks the motor phase voltage and establishes the common-mode baseline for current sensing. VS must be connected directly to the shunt resistor's low-side terminal and remains at up to +600V relative to COM, enabling true high-side sensing without level-shifting components.

Can the IR2175 operate without a bootstrap supply?

Yes - the IR2175 supports both bootstrap (VB connected to VS via capacitor) and isolated DC supply configurations. When using isolated supply, apply 13–20V between VB and VS pins. The 2mA IQBS rating ensures compatibility with small bootstrap capacitors, but isolated supply eliminates duty-cycle limitations and improves reliability in continuous high-duty applications.

How does the IR2175 achieve temperature-stable current measurement?

The IR2175 achieves temperature stability through matched on-die resistor networks and curvature-compensated bandgap references, resulting in only 20ppm/°C gain drift and 0.005%/°C linearity drift. Its internal modulator architecture also allows ratio-metric correction - measuring both PWM period and on-time simultaneously cancels out carrier frequency temperature drift in final current calculation.

Is the OC output compatible with 3.3V microcontrollers?

Yes - the OC pin is an open-drain output with rail-to-rail sink capability (10mA min). When pulled up to 3.3V, it delivers clean active-low logic transitions compatible with standard CMOS inputs. No level-shifter is required, and the 2µs propagation delay ensures timely fault capture even at high MCU clock speeds.