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

Infineon Technologies IRS279524SPBF

Name: IRS279524SPBF
Brand: Infineon Technologies
SKU: IRS279524SPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRS279524SPBF

Manufacturer:: Infineon Technologies

Category:: DC DC Switching Controllers

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

Datasheet:: IRS279524SPBF.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,892

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Product details

Overview

IRS279524SPBF from Infineon Technologies (formerly International Rectifier) is a self-oscillating resonant half-bridge control IC for LLC converters, featuring programmable 44–299 kHz switching frequency, 170–250 ns dead time, ±600 V high-side floating operation, and integrated over-current protection using low-side MOSFET R_DS(on). It targets high-efficiency AC/DC power supplies in LCD/PDP TVs and telecom SMPS.

For engineers reviewing the IRS279524SPBF datasheet, IRS279524SPBF pinout, IRS279524SPBF application, or IRS279524SPBF equivalent, key selection criteria include its dual-channel gate drive capability (300 mA source / 900 mA sink), micropower sleep mode (150–200 µA), programmable soft-start timing, and bootstrap-based high-side operation up to +600 Vdc.

Technical Context

The IRS279524SPBF implements a voltage-controlled oscillator with external RT/CT programming to set minimum and maximum switching frequencies, enabling fixed- or variable-frequency resonant control. Its internal state machine includes leading-edge blanking (300 ns), shutdown propagation delay (300 ns), and matched dead-time generation between HO and LO outputs.

It integrates independent UVLO on both VCC (10.1–11.9 V turn-on, 2 V hysteresis) and VBS (7.6–9.4 V turn-on, 0.6 V hysteresis), plus over-current detection referenced to VS with 1.9–2.1 V threshold for IRS279524 variants. The CT/SD pin supports enable/disable and sleep-mode initiation via voltage thresholds (VEN1 = 1.05 V, VEN2 = 0.85 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Resonant half-bridge (LLC) controller with self-oscillating architecture
f_SW Range	44.3–299 kHz - externally set via RT (2–100 kΩ) and CT (200–2000 pF)
V_OFFSET	600 V - supports high-side floating operation up to +600 Vdc referenced to COM
I_O+/I_O−	300 mA / 900 mA - drives high-side and low-side MOSFET gates with asymmetric sink/source strength
t_DT	170–250 ns - programmable dead time prevents shoot-through in half-bridge power stage
I_QCC	2–2.5 mA - quiescent supply current enables low-power standby operation
V_OCP	1.9–2.1 V - over-current threshold tied to low-side MOSFET R_DS(on) sensing

Pinout & Package

IRS279524SPBF is housed in a 14-lead SOIC (SOIC14N) package with exposed pad for thermal enhancement. Pin assignments are validated per IRF datasheet revision August 2015.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14	See pin mapping below	Standard SOIC14N lead frame; no thermal pad connection required for basic operation
1 (COM)	Power ground reference	Common return for VCC, LO, and current-sense circuitry
2 (CT/SD)	Control timer / shutdown input	RC network sets oscillator frequency; <0.85 V initiates micropower sleep mode
3 (HO)	High-side gate driver output	Drives upper MOSFET gate with 300 mA source / 900 mA sink capability
4 (VS)	High-side floating source node	References HO output; withstands −3 V to +600 V offset vs. COM
5 (LO)	Low-side gate driver output	Drives lower MOSFET gate; referenced to COM
6 (VCC)	Logic supply input	12–18 V supply with UVLO (10.1–11.9 V turn-on)
7 (VB)	High-side bootstrap supply	Charged via external diode/capacitor; UVLO at 7.6–9.4 V
8 (RT)	Oscillator timing resistor input	Sets min/max f_SW; 2–100 kΩ range with 2.0 V internal reference
9–14	No-connect / thermal pad tie	Pins 9–13 are NC; Pin 14 is NC but may be bonded to exposed pad for thermal relief

Key Features

Feature	Design Value
Programmable dead time	200 ns–2 µs via CT capacitor - prevents cross-conduction in resonant half-bridge
Micropower sleep mode	150–200 µA VCC current when CT/SD < 0.85 V - reduces standby losses in TV/SMPS applications
Floating channel operation	+600 Vdc max offset on VS node - enables direct drive of high-side MOSFET in bridge topologies
Over-current protection	Voltage threshold (1.9–2.1 V) across low-side R_DS(on) - eliminates need for external sense resistor
Soft-start control	Frequency and time programmable via RT/CT - avoids inrush current during startup

Applications

LCD & PDP TV Power Supplies

Telecom SMPS

Use Scenario: Primary-side resonant DC-DC conversion in slim-panel TV backlights and main power rails.

IC Role / Device Role / Timing Role: Self-oscillating half-bridge controller managing LLC tank resonance and gate timing.

Use Value: Enables >92% efficiency at light load via programmable frequency sweep and micropower sleep mode.

Use Scenario: High-density 48 V input telecom rectifiers delivering isolated 12 V/54 A outputs.

IC Role / Device Role / Timing Role: Resonant converter controller synchronizing ZVS transitions across wide load range.

Use Value: Reduces EMI through soft-switched operation and eliminates external timing ICs.

PC SMPS

Home Audio Amplifier Power Stages

Use Scenario: ATX-compatible 80 PLUS Gold PSUs requiring high efficiency at 20–100% load.

IC Role / Device Role / Timing Role: Fixed-frequency LLC controller driving GaN or Si MOSFET half-bridge.

Use Value: Achieves <30 mW no-load consumption using CT/SD-initiated sleep mode.

Use Scenario: Class-D amplifier front-end power conversion with fast transient response.

IC Role / Device Role / Timing Role: Variable-frequency resonant controller adapting to dynamic audio load profiles.

Use Value: Maintains ZVS across 10:1 load variation via real-time f_SW modulation.

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 adaptive dead-time control and digital frequency dithering; requires external MCU for configuration	Targets higher-precision ZVS tracking in server PSUs; lacks micropower sleep mode	Choose for digitally tunable systems needing tighter regulation; avoid if analog simplicity is prioritized
IR3584MTRPBF	Dual-phase synchronous buck controller with integrated drivers; no resonant topology support	Designed for VR12/13 CPU power delivery, not LLC half-bridge	Not functionally equivalent - only suitable if migrating to non-resonant topologies

Compared with UCC256301DR and IR3584MTRPBF, IRS279524SPBF delivers plug-and-play resonant control without firmware, lower BOM count, and proven 600 V floating operation - making it optimal for cost-sensitive, high-volume TV and telecom SMPS designs where analog reliability outweighs digital configurability.

Availability

IRS279524SPBF is available at Aetrix Electronics and suitable for LCD & PDP TV power supplies, telecom SMPS, and PC SMPS requiring stable component supply and long-term industrial availability.

Supply support for IRS279524SPBF 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 global manufacturing and quality certification to IATF 16949 and ISO 9001.

The IRS2795x family was developed specifically for resonant LLC half-bridge converters in consumer and telecom power supplies, emphasizing minimal external components, robust high-voltage operation, and analog programmability.

FAQ

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

The IRS279524SPBF specifies an allowable offset voltage slew rate of ±50 V/ns on the VS pin. Exceeding this limit risks false triggering of internal level shifters or latch-up. Layout best practices include minimizing loop area between VS and COM, using low-inductance gate drive paths, and avoiding sharp-edged switching waveforms in proximity to VS routing.

Can IRS279524SPBF drive GaN HEMTs directly?

Yes - its 300 mA source / 900 mA sink gate drive strength and 600 V floating capability support direct drive of enhancement-mode GaN HEMTs with Q_g ≤ 15 nC. However, external negative turn-off bias (e.g., −2 V) is recommended for reliable GaN gate control, requiring minor circuit modification beyond the standard bootstrap configuration.

How does over-current protection work without a sense resistor?

The IRS279524SPBF monitors voltage across the low-side MOSFET's intrinsic R_DS(on) during conduction. When the sensed voltage exceeds 1.9–2.1 V (typical), the IC disables both HO and LO outputs. This eliminates external shunt resistors but requires accurate R_DS(on) knowledge and temperature compensation in final design validation.

Is there a difference between IRS27952SPBF and IRS279524SPBF?

Yes - IRS279524SPBF is the 14-pin SOIC variant with dedicated pins for RT, CT/SD, VB, VS, HO, LO, VCC, and COM, whereas IRS27952SPBF is the 8-pin SOIC version sharing functions on fewer pins (e.g., combined CT/SD and RT). The 14-pin version offers independent control of soft-start, frequency range, and shutdown, enabling more precise resonant tuning in demanding applications.

IRS279524SPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tube

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

IRS279524SPBF FAQ

1.How can I place an order for IRS279524SPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRS279524SPBF 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 IRS279524SPBF reliable?

The price and inventory of IRS279524SPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRS279524SPBF is usually 5 days.

3.What payment methods are accepted for IRS279524SPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRS279524SPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRS279524SPBF?

IRS279524SPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRS279524SPBF 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 IRS279524SPBF?

For technical support, including IRS279524SPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRS279524SPBF requirements.

6.How does Aetrix verify that IRS279524SPBF is sourced from the original manufacturer or authorized distributors?

All IRS279524SPBF 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 IRS279524SPBF meets industry standards.

7.What is the process for return or replacement of IRS279524SPBF?

All IRS279524SPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRS279524SPBF, 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 IRS279524SPBF part is unused and in its original packaging.

Return procedure for IRS279524SPBF:

1.Submit a request within 90 days.

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

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