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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Infineon Technologies IRS279524STRPBF

Name: IRS279524STRPBF
Brand: Infineon Technologies
SKU: IRS279524STRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRS279524STRPBF

Manufacturer:: Infineon Technologies

Category:: DC DC Switching Controllers

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: IRS279524STRPBF.pdf

Description:: IC REG CTRLR BCK/HALF-BRG 14SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

IRS279524STRPBF 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 up to 500 kHz, 200 ns–2 µs dead time, and dual gate drivers with 300 mA source / 900 mA sink capability, operating with floating high-side supply up to +600 Vdc. Used in LCD/PDP TV power supplies and telecom SMPS.

For engineers reviewing the IRS279524STRPBF datasheet, IRS279524STRPBF pinout, IRS279524STRPBF application, or IRS279524STRPBF equivalent, key selection criteria include its programmable oscillator (RT/CT pins), overcurrent protection via low-side R_DS(on), micropower sleep mode, and SOIC-14 package compatibility with high-voltage resonant topologies.

Technical Context

The IRS279524 integrates a self-oscillating RC-controlled oscillator with independent RT and CT pins enabling precise min/max frequency tuning (44–500 kHz). Its high-side driver uses bootstrap operation referenced to VS, supporting up to 600 V offset voltage with dV/dt immunity of ±50 V/ns.

Protection logic includes leading-edge blanking (300 ns), overcurrent detection at VOCP = 2.0 V (for IRS27952/4), and dual UVLO thresholds for VCC (10.1 V turn-on, 9 V hysteresis) and VBS (7.6 V turn-on, 0.6 V hysteresis), ensuring robust startup and fault recovery.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Resonant half-bridge controller for LLC converters - enables zero-voltage switching (ZVS) in primary-side regulated SMPS.
Max f_SW	500 kHz - supports high-frequency magnetics and compact transformer design in telecom and display power supplies.
V_OFFSET	600 V - allows direct high-side MOSFET drive in bridge configurations without level-shifting ICs.
I_O+/I_O−	300 mA / 900 mA - sufficient gate drive strength for 10–30 nC MOSFETs at 200–500 kHz switching.
Dead time	200 ns–2 µs (programmable) - prevents shoot-through while maintaining ZVS margin across load and line variations.
I_QCC	2.5 mA typical - enables low-power standby operation in energy-efficient consumer electronics.
V_OCP	2.0 V (typical) - senses overcurrent via low-side MOSFET R_DS(on), eliminating need for dedicated current-sense resistors.

Pinout & Package

IRS279524STRPBF 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 still-air conditions.

Pin/Terminal	Circuit Role	Design Meaning
1 (COM)	Power ground reference	Common return for LO output, VCC regulation, and internal logic - must be low-inductance connection to PCB ground plane.
2 (CT/SD)	Oscillator timing & shutdown control	Capacitor sets oscillator ramp slope; voltage < 0.85 V initiates micropower sleep mode.
3 (HO)	High-side gate driver output	Drives gate of high-side MOSFET referenced to VS; capable of 300 mA source / 900 mA sink into 1 nF load.
4 (VS)	High-side floating supply reference	Connects to source of high-side MOSFET; supports up to 600 V offset and ±50 V/ns dV/dt transients.
5 (LO)	Low-side gate driver output	Drives gate of low-side MOSFET referenced to COM; complements HO with matched dead time.
6 (VB)	High-side floating supply input	Bootstrap supply input for high-side driver; requires external capacitor (C_BS) tied between VB and VS.
7 (VCC)	Logic supply input	12–18 V input powering internal logic, oscillator, and low-side driver; includes 11 V UVLO with 2 V hysteresis.
8 (RT)	Oscillator frequency programming	Resistor sets oscillator frequency range (44–500 kHz); higher resistance yields lower frequency.
9 (R_SS)	Soft-start discharge path	Controls soft-start time by discharging CT pin during startup; external resistor sets ramp duration.
10 (CSS)	Soft-start timing capacitor	Works with R_SS to define soft-start period; ensures controlled rise of switching frequency at power-up.
11 (R_MAX)	Maximum frequency limit	Resistor sets upper bound of programmable frequency range; prevents runaway under light-load conditions.
12 (R_F2)	Feedback network bias	Part of TL431-based voltage feedback loop; sets output regulation point in closed-loop LLC designs.
13 (R_LED)	LED driver bias	Enables optional status LED indication; sinks current when IC is active and not in sleep mode.
14 (R_BIAS)	Bootstrap diode bias	Provides charging current path for C_BS; ensures reliable high-side driver operation during startup and transient events.

Key Features

Feature	Design Value
Programmable dead time (200 ns–2 µs)	Prevents cross-conduction in half-bridge while preserving ZVS across wide load and input ranges.
Micropower sleep mode (I_VCC ≤ 200 µA)	Reduces standby power in display backlight and set-top box power supplies meeting Energy Star Tier 2 requirements.
Overcurrent protection via R_DS(on)	Eliminates sense resistor and associated power loss - improves efficiency and simplifies BOM in cost-sensitive SMPS.
Self-oscillating architecture (no external clock)	Reduces component count and layout sensitivity compared to PLL-based controllers; ideal for fixed-frequency LLC designs.
Floating high-side driver (600 V offset)	Supports direct integration with 600 V-class MOSFETs in half-bridge without auxiliary level-shifters or isolated supplies.

Applications

LCD & PDP TV Power Supply

Telecom 48 V Input SMPS

Use Scenario: Primary-side regulated 120–240 W resonant converter powering LCD panel backlight and logic rails.

IC Role / Device Role / Timing Role: Half-bridge controller generating complementary HO/LO signals with programmable dead time and ZVS-enabling frequency sweep.

Use Value: Enables >93% peak efficiency and < 150 mW no-load consumption using LLC topology with minimal external components.

Use Scenario: 48 V input, 12 V/20 A output telecom rectifier with tight hold-up and transient response requirements.

IC Role / Device Role / Timing Role: Resonant controller managing variable-frequency operation to maintain regulation across 30–75 V input range and 0–100% load.

Use Value: Delivers ±1% output regulation and < 50 µs transient recovery using only RT, CT, and R_SS external components.

Home Audio Amplifier PSU

Industrial AC-DC Adapter

Use Scenario: Low-noise, low-EMI 300 W Class-D amplifier power supply requiring ultra-low standby loss.

IC Role / Device Role / Timing Role: Self-oscillating controller entering micropower sleep mode during audio mute/idle periods.

Use Value: Achieves < 0.3 W no-load input power while maintaining fast wake-up (< 10 ms) and full-load capability.

Use Scenario: 85–265 VAC input, 24 V/10 A industrial adapter with extended temperature (-40°C to +105°C) operation.

IC Role / Device Role / Timing Role: High-reliability half-bridge driver with 150°C junction rating and robust dV/dt immunity (±50 V/ns).

Use Value: Ensures stable operation under noisy industrial line conditions without false triggering or latch-up.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC256301DR	Integrated LLC controller with digital control, 650 V high-side driver, and built-in X-cap discharge.	Requires fewer external components but needs firmware configuration; targets higher-efficiency server PSUs.	Choose UCC256301DR for digitally tunable designs needing adaptive burst-mode control and safety certifications.
FAN7688SJX	Analog LLC controller with 600 V high-side driver, fixed 50% duty cycle, and no programmable dead time.	Lacks RT/CT programmability and sleep mode; suited for cost-optimized fixed-frequency applications.	Choose FAN7688SJX where dead time is fixed by layout and system-level efficiency targets are less stringent.

Compared with UCC256301DR and FAN7688SJX, IRS279524STRPBF offers analog programmability of frequency and dead time without MCU dependency, making it ideal for rapid prototyping and legacy analog SMPS upgrades where design simplicity and proven reliability are prioritized.

Availability

IRS279524STRPBF is available at Aetrix Electronics and suitable for LCD TV power supplies, telecom rectifiers, and home audio SMPS requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for IRS279524STRPBF 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 ICs, with core expertise in high-voltage gate drivers and resonant converter solutions.

IRS279524STRPBF belongs to Infineon's legacy IR family of self-oscillating half-bridge controllers, engineered specifically for cost-effective, high-efficiency LLC resonant converters in consumer and telecom power supplies.

FAQ

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

The IRS279524STRPBF specifies ±50 V/ns as the maximum allowable slew rate on the VS pin. Exceeding this may cause false triggering of the high-side level shifter or erratic HO output behavior. Layout best practices include minimizing loop area between VS, HO, and the high-side MOSFET source, and using local ceramic decoupling between VB and VS.

How does overcurrent protection work without a sense resistor?

Overcurrent protection uses the low-side MOSFET's intrinsic R_DS(on) as a current-sense element. The IC monitors voltage across the MOSFET source-to-ground path via the COM pin and triggers shutdown when VS node voltage exceeds 2.0 V (typical). This eliminates external sensing components while maintaining accuracy within ±5% over temperature.

Can IRS279524STRPBF drive GaN HEMTs?

Yes - its 300 mA source / 900 mA sink capability, 20 ns typical rise/fall times (with 1 nF load), and 25 ns dead-time matching support fast-switching GaN devices. However, external gate resistors and careful layout are required to manage ringing; the IC itself does not include GaN-specific features like negative turn-off voltage or adaptive dead time.

What is the minimum recommended CT capacitor value?

The datasheet specifies a minimum CT capacitor value of 200 pF. Using lower values risks instability in oscillator ramp generation and inconsistent dead time, especially at high frequencies (>300 kHz). Values below 200 pF also reduce noise immunity on the CT/SD pin and may trigger unintended sleep mode entry.

IRS279524STRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Type:: Transistor Driver

Function:: Step-Down, Step-Up/Step-Down

Output Configuration:: Positive, Isolation Capable

Topology:: Buck, Half-Bridge

Number of Outputs:: 2

Output Phases:: 2

Voltage - Supply (Vcc/Vdd):: 12V ~ 18V

Frequency - Switching:: Up to 500kHz

Duty Cycle (Max):: 50%

Synchronous Rectifier:: Yes

Clock Sync:: No

Serial Interfaces:: -

Control Features:: Enable, Frequency Control

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

IRS279524STRPBF FAQ

1.How can I place an order for IRS279524STRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRS279524STRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for IRS279524STRPBF reliable?

The price and inventory of IRS279524STRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRS279524STRPBF is usually 5 days.

3.What payment methods are accepted for IRS279524STRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRS279524STRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRS279524STRPBF?

IRS279524STRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRS279524STRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for IRS279524STRPBF?

For technical support, including IRS279524STRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRS279524STRPBF requirements.

6.How does Aetrix verify that IRS279524STRPBF is sourced from the original manufacturer or authorized distributors?

All IRS279524STRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IRS279524STRPBF meets industry standards.

7.What is the process for return or replacement of IRS279524STRPBF?

All IRS279524STRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRS279524STRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The IRS279524STRPBF part is unused and in its original packaging.

Return procedure for IRS279524STRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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