International Test Instruments Corporation IR2277SPBF

Overview

IR2277SPBF from Infineon Technologies is a high-voltage, single-phase phase current sensor IC for AC motor drives, featuring 1200 V floating channel capability, <7.5 µs sensing latency at 20 kHz, ratiometric analog output (OUT), digital PWM output (PO), and fast overcurrent detection (OC) with ±470 mV threshold. It interfaces with external shunt resistors and supports bootstrap power supplies in IGBT-based inverters.

For engineers reviewing the IR2277SPBF datasheet, IR2277SPBF pinout, IR2277SPBF application, or IR2277SPBF equivalent, key selection criteria include floating voltage rating (1200 V), synchronous sampling timing, PWM noise rejection performance, OC response time (<4.7 µs), and compatibility with DSP A/D interfaces via ratiometric OUT scaling.

Technical Context

The IR2277SPBF implements a synchronous sampling measurement system that converts differential shunt voltage (±250 mV) into a time interval using precision internal circuitry, achieving high common-mode rejection (100 dB for OUT, 0.2 m%/V for PO) against VS offset up to 1200 V. Its group delay is ≤4 µs at 10 kHz sync frequency.

It delivers dual outputs: a ratiometric analog voltage (OUT) referenced to VRH/VRL (3 V typical span), and a digital PWM signal (PO) with gain of –40.5 %/V and linearity of 0.2 %, both synchronized to an external SYNC input (8–20 kHz). OC is open-drain with 25–75 Ω on-resistance and 2.7–4.7 µs de-bounce time.

Key Specifications

Pinout & Package

IR2277SPBF is housed in an 8-pin SOIC package (SOIC-8, body width 3.9 mm, JEDEC MS-012), with creepage/clearance optimized for 1200 V isolation. Pin functions are validated per IRF PD60233 revB datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar phase current sensor applications.

Compared with IR2177SPBF and AMC1301SDWVR, IR2277SPBF uniquely combines 1200 V floating capability, integrated OC protection, and dual analog/PWM outputs - making it optimal for cost-sensitive, high-reliability AC motor inverters needing minimal external components and deterministic fault response.

Availability

IR2277SPBF is available at Aetrix Electronics and suitable for industrial AC motor drives, EV traction inverters, appliance inverter systems, and industrial servo drives requiring stable component supply and long-term production continuity.

Supply support for IR2277SPBF 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, and industrial control ICs, with leadership in high-voltage gate drivers and sensor interfaces.

The IR2277SPBF belongs to Infineon's high-voltage current sensor product line, designed specifically to replace discrete op-amp/isolation solutions in AC motor inverter current feedback paths.

FAQ

What is the maximum allowable dV/dt on the VS pin?

The IR2277SPBF specifies a maximum allowable offset voltage slew rate of 50 V/ns on the VS pin. This limit ensures internal level-shifting circuitry remains within safe operating margins during fast IGBT switching transitions. Exceeding this rate may cause temporary measurement inaccuracies or latch-up. Layout best practices include minimizing parasitic inductance in the VS return path and using local ceramic decoupling between VB and VS.

Can IR2277SPBF operate with a 3.3 V logic supply?

Yes - VCC operates from 8 V to 20 V, so a 3.3 V supply cannot be applied directly. However, the PO and OC outputs are open-drain and compatible with 3.3 V logic when pulled up to 3.3 V (not VCC), provided VCC itself remains ≥8 V. The OUT analog output is ratiometric to VRH/VRL, so referencing VRH/VRL to 3.3 V yields a 0–3.3 V output swing usable by 3.3 V ADCs.

How does the SYNC input affect measurement accuracy?

The SYNC input defines the sampling instant for each conversion cycle. Jitter on SYNC directly translates to timing uncertainty in the measured time interval, causing gain error in both PO and OUT outputs. For 0.1 % accuracy, SYNC jitter must be ≤100 ps RMS. Recommended practice is to derive SYNC from the same clock source used for PWM generation to eliminate relative jitter and ensure deterministic sampling alignment.

Is external filtering required on the VIN+ and VIN− inputs?

No external RC filtering is required - the IR2277SPBF's synchronous sampling architecture inherently rejects high-frequency PWM ripple (up to 20 kHz) without analog filters. However, a small 100 pF capacitor across VIN+ and VIN− is recommended to suppress RF noise above 100 MHz. Larger capacitors degrade step response and increase latency beyond the specified <7.5 µs, violating timing-critical control loop requirements.