Infineon Technologies IRS27952STRPBF

Overview

IRS27952STRPBF from Infineon Technologies (formerly International Rectifier) is a self-oscillating resonant half-bridge control IC designed for LLC DC-DC converters. It delivers programmable switching frequency (44–500 kHz), 200 ns–2 µs dead time, 300 mA high-side/900 mA low-side gate drive, and over-current protection via low-side MOSFET R_DS(on) sensing. Used in LCD/PDP TV power supplies and telecom SMPS.

For engineers reviewing the IRS27952STRPBF datasheet, IRS27952STRPBF pinout, IRS27952STRPBF application, or IRS27952STRPBF equivalent, this page provides verified functional specifications, SOIC-14 package mapping, real-world timing behavior, and validated alternatives for resonant converter design.

Technical Context

The IRS27952STRPBF integrates a self-oscillating oscillator with external RT/CT programming, enabling precise frequency and dead-time control without external clock sources. Its floating high-side driver supports up to +600 V offset voltage (VS), with UVLO on both VCC (11 V turn-on, 9 V turn-off) and VBS (8.5 V turn-on, 7.9 V turn-off).

It implements leading-edge blanking (300 ns), micropower sleep mode (150–200 µA VCC current), and over-current detection using the VS node threshold (2.0 V typical). The internal pulse steering logic ensures matched dead-time propagation between HO and LO outputs (≤25 ns mismatch).

Key Specifications

Pinout & Package

IRS27952STRPBF is housed in a 14-lead SOIC (SOIC-14N) package with standard 1.27 mm pitch, gull-wing leads, and exposed pad not electrically connected. Thermal resistance R_thJA = 120 °C/W under board-mounted, still-air conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar resonant half-bridge control applications.

Compared with UCC256301DR and FAN7688MX, IRS27952STRPBF uniquely combines R_DS(on)-based OCP, micropower sleep, and fully programmable dead time-making it optimal for high-reliability, low-standby consumer power supplies where component count and efficiency are critical.

Availability

IRS27952STRPBF is available at Aetrix Electronics and suitable for LCD TV power supplies, telecom 48 V SMPS, and PC ATX main converters requiring stable component supply, long-lifecycle support, and lead-free compliance.

Supply support for IRS27952STRPBF 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 acquired International Rectifier in 2015 and continues its legacy of high-voltage power ICs for resonant and hard-switched topologies.

The IRS2795x family was engineered specifically for self-oscillating LLC half-bridge converters in consumer and telecom power supplies, emphasizing minimal external components and robust protection.

FAQ

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

The datasheet specifies ±50 V/ns as the absolute maximum dV/dt on the VS pin. Exceeding this may cause erroneous over-current triggering or latch-up. Layout best practice requires minimizing loop inductance between VS and low-side MOSFET source, and using local 100 pF ceramic decoupling at the VS pin.

Can IRS27952STRPBF drive GaN HEMTs directly?

Yes - its 300 mA HO source and 900 mA LO sink currents, combined with ≤65 ns fall time into 4.7 nF, meet gate drive requirements for common 650 V GaN HEMTs. However, external negative turn-off bias or active Miller clamp is recommended to ensure robust switching under high dV/dt.

How is the minimum switching frequency set?

Minimum frequency is set by the RT resistor value: 2 kΩ yields ~500 kHz, while 100 kΩ yields ~44 kHz. The relationship is approximately f_SW(min) ≈ 1/(1.1 × R_RT × C_CT). For stable operation, R_RT must remain within 2–100 kΩ per datasheet limits.

Does IRS27952STRPBF support synchronous rectification control?

No - IRS27952STRPBF provides only half-bridge gate drive outputs (HO/LO) and does not generate auxiliary timing signals for synchronous rectifier MOSFETs. External circuitry or a companion IC (e.g., IR1167) is required to implement SR control in LLC designs.