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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Infineon Technologies IRS2540STRPBF

Name: IRS2540STRPBF
Brand: Infineon Technologies
SKU: IRS2540STRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRS2540STRPBF

Manufacturer:: Infineon Technologies

Category:: LED Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: IRS2540STRPBF.pdf

Description:: IC LED DRIVER CTRLR PWM 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:4,581

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Product details

Overview

IRS2540STRPBF from Infineon Technologies is a high-voltage, continuous-mode time-delayed hysteretic buck controller IC designed for constant-current LED regulation in offline AC/DC LED drivers. It integrates a ±2% on-chip bandgap reference, 140 ns deadtime control, 15.6 V zener-clamped VCC, and dual gate drivers (HO/LO) supporting up to 500 kHz switching - enabling direct average current control without external compensation in single-MOSFET or half-bridge topologies.

For engineers reviewing the IRS2540STRPBF datasheet, IRS2540STRPBF pinout, IRS2540STRPBF application, or IRS2540STRPBF equivalent, key selection criteria include its 200 V high-side floating supply rating, micropower startup (<500 µA), watchdog timer–enabled open-circuit protection, PWM dimming capability via ENN pin, and SOIC-8 package compatibility with standard LED driver PCB layouts.

Technical Context

The IRS2540STRPBF implements a self-oscillating, time-delayed hysteretic control architecture that regulates LED current by comparing IFB voltage (threshold = 500 mV) against an internal 0.5 V bandgap reference. No external frequency-setting components are required, and loop stability is inherent due to fixed hysteresis and propagation delays (tHO,ON = 320 ns, tHO,OFF = 180 ns).

It features integrated high-side (VS-referenced) and low-side (COM-referenced) gate drivers with 140 ns programmable deadtime, a 20 µs watchdog timer to refresh the bootstrap capacitor during open-circuit faults, and ENN-pin–based disable/dimming with 2.5 V logic threshold - all operating within a 6.5–10.0 V UVLO window and 15.6 V VCC clamp.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BS Max	200 V - Supports high-side MOSFET operation in buck converters up to 200 V bus voltage
V_IFBTH	500 mV ±40 mV - Precise current-sense threshold enabling accurate LED current regulation
f_MAX	500 kHz - Enables compact magnetics and reduced output ripple in space-constrained LED drivers
Deadtime	140 ns - Prevents shoot-through in half-bridge configurations without external timing circuitry
V_CLAMP	15.6 V - Internal zener limits VCC stress; requires external bias current ≥10 mA for regulation
I_QCCUV	≤150 µA - Ultra-low quiescent current during UVLO ensures reliable cold-start in offline applications
t_WD	20 µs - Watchdog period maintains bootstrap charge during open-circuit fault conditions

Pinout & Package

IRS2540STRPBF is housed in an 8-lead SOIC package (body width 3.9 mm, JEDEC MS-012), with gull-wing leads, RoHS-compliant matte tin plating, and thermal resistance R_THJA = 200 °C/W under still-air conditions.

Pin/Terminal	Circuit Role	Design Meaning
1 - IFB	Current feedback input	Connects to RCS shunt resistor; 500 mV threshold sets regulated LED current I_OUT = 0.5 V / R_CS
2 - VCC	IC power supply	15.6 V zener-clamped input; requires ≥10 mA bias current for stable operation
3 - ENN	Enable/disable & PWM dimming input	Logic-high (>2.5 V) disables HO/LO; PWM signal enables analog dimming with linear duty-cycle correlation
4 - LO	Low-side gate driver output	Drives N-channel MOSFET source-connected to COM; complements HO with 140 ns deadtime
5 - VS	High-side floating return	Reference node for HO output; tied to switch-node in half-bridge or buck configurations
6 - HO	High-side gate driver output	Drives N-channel MOSFET source-connected to VS; operates with bootstrap-supplied V_BS
7 - VB	Bootstrap supply input	Accepts charge from external bootstrap diode/capacitor; supplies floating gate drive for HO
8 - COM	Signal and power ground	Common reference for VCC, IFB, ENN, LO; must be low-impedance path to minimize noise coupling

Key Features

Feature	Design Value
Time-delayed hysteretic control	Eliminates need for external compensation network and oscillator components - reduces BOM count and layout sensitivity
Integrated watchdog timer	20 µs periodic LO/HO toggle sustains bootstrap charge during open-circuit LED faults - prevents high-side driver dropout
140 ns programmable deadtime	Hardware-enforced delay prevents shoot-through in half-bridge topologies without external logic or RC networks
PWM dimming via ENN pin	Direct linear correlation between enable signal duty cycle and average LED current - supports microcontroller-driven dimming
Micropower startup	<500 µA ICC at power-up enables reliable start under weak auxiliary supplies common in offline LED drivers

Applications

LED Street Lighting Driver

Commercial Downlight Power Supply

Use Scenario: Constant-current 40–100 W LED module powered directly from rectified 230 VAC mains with PFC stage omitted.

IC Role / Device Role / Timing Role: Primary buck controller regulating average LED current via IFB feedback; HO/LO drive external MOSFETs in single-switch buck topology.

Use Value: 200 V V_BS rating allows direct interface with 200 V DC bus; 500 kHz max frequency enables <10 mm inductor height; watchdog timer ensures fail-safe open-circuit shutdown.

Use Scenario: Dimmable 12–24 V, 1–3 A LED array in office ceiling fixtures using trailing-edge phase-cut dimmers.

IC Role / Device Role / Timing Role: Current regulator with ENN-pin PWM dimming interface; accepts 0–10 V or microcontroller-generated square wave for brightness control.

Use Value: 2.5 V ENN threshold provides noise immunity against dimmer-induced ground bounce; linear dimming response eliminates flicker at >2 kHz modulation frequency.

Industrial LED Machine Vision Light

Outdoor LED Signage Power Module

Use Scenario: High-stability, strobe-capable illumination for automated inspection systems requiring precise current repeatability across temperature.

IC Role / Device Role / Timing Role: Hysteretic current controller with ±2% reference accuracy; LO/HO outputs synchronized to external trigger for pulsed LED operation.

Use Value: 0.5 V bandgap reference and 500 mV IFB threshold deliver <±3% LED current variation over –25°C to +125°C junction range.

Use Scenario: Weatherproof, convection-cooled LED panel powering RGB pixel arrays in outdoor advertising displays.

IC Role / Device Role / Timing Role: Robust buck controller managing multiple parallel LED strings with shared current sense; withstands 200 V transients per IEC 61000-4-5.

Use Value: 200 V V_BS rating and dV/dt filter on IFB pin suppress ESD-induced false triggering; SOIC-8 package supports conformal coating and thermal pad attachment.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRS2541STRPBF	600 V high-side floating supply rating vs. 200 V; identical pinout and functional blocks	Suitable for higher-input-voltage LED drivers (e.g., 380 V DC bus in industrial HVDC systems)	Select when V_BS > 200 V is required; otherwise IRS2540STRPBF offers lower cost and optimized thermal performance at 200 V
LM3445MM/NOPB	Fixed-frequency peak-current-mode controller; requires external ramp compensation and oscillator resistor	Better suited for designs needing tight EMI control via spread-spectrum or synchronous rectification coordination	Choose when deterministic switching frequency and phase-locking to system clock are mandatory; IRS2540STRPBF preferred for simplicity and minimal component count

Compared with IRS2541STRPBF, the IRS2540STRPBF trades higher voltage tolerance for lower gate drive losses and improved thermal margin at 200 V bus levels; versus LM3445MM/NOPB, it eliminates compensation design effort and reduces bill-of-materials by 3–5 passive components while retaining robust open-circuit protection.

Availability

IRS2540STRPBF is available at Aetrix Electronics and suitable for LED street lighting drivers, commercial downlight power supplies, industrial machine vision illuminators, and outdoor signage modules requiring stable component supply and long-term production continuity.

Supply support for IRS2540STRPBF 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 electronics, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The IRS254x family targets cost-sensitive, high-reliability LED lighting applications where minimal external components, inherent fault protection, and wide input voltage range are critical - particularly in non-isolated buck-based AC/DC LED drivers.

FAQ

What is the minimum bootstrap capacitor value recommended for IRS2540STRPBF?

The datasheet specifies a typical bootstrap capacitor value of 100 nF. This value ensures sufficient charge retention over the 20 µs watchdog timer interval under worst-case load and temperature conditions. Using <68 nF risks premature V_BS droop, causing incomplete HO turn-on and elevated conduction losses in the high-side MOSFET.

Can IRS2540STRPBF operate without a bootstrap diode?

No - the IRS2540STRPBF requires an external fast-recovery bootstrap diode (e.g., UF4007 or similar) to charge the VB capacitor during LO conduction. The diode cathode connects to V_CC, anode to VB; reverse recovery time must be ≤75 ns to prevent V_BS collapse during high-dV/dt switching transitions.

How does the ENN pin behave during undervoltage lockout (UVLO)?

During UVLO (V_CC < 6.5 V), the ENN pin is internally ignored - HO remains low and LO remains high regardless of ENN voltage. Once V_CC rises above 9.0 V, ENN functionality resumes, allowing normal enable/disable and PWM dimming operation with 2.5 V threshold and 0.7 V hysteresis.

Is IRS2540STRPBF compatible with synchronous rectification?

Yes - the dedicated LO output is designed to drive a low-side N-channel MOSFET as a synchronous rectifier. Its 140 ns deadtime and matched propagation delays (tLO,ON = 320 ns, tLO,OFF = 180 ns) ensure safe commutation with the HO output, minimizing body-diode conduction loss in buck-derived topologies.

IRS2540STRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: DC DC Controller

Topology:: Step-Down (Buck)

Internal Switch(s):: No

Number of Outputs:: 1

Voltage - Supply (Min):: 9V

Voltage - Supply (Max):: 15.6V

Voltage - Output:: -

Current - Output / Channel:: -

Frequency:: 500kHz

Dimming:: PWM

Applications:: -

Operating Temperature:: -25°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

IRS2540STRPBF FAQ

1.How can I place an order for IRS2540STRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRS2540STRPBF 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 IRS2540STRPBF reliable?

The price and inventory of IRS2540STRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRS2540STRPBF is usually 5 days.

3.What payment methods are accepted for IRS2540STRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRS2540STRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRS2540STRPBF?

IRS2540STRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRS2540STRPBF 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 IRS2540STRPBF?

For technical support, including IRS2540STRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRS2540STRPBF requirements.

6.How does Aetrix verify that IRS2540STRPBF is sourced from the original manufacturer or authorized distributors?

All IRS2540STRPBF 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 IRS2540STRPBF meets industry standards.

7.What is the process for return or replacement of IRS2540STRPBF?

All IRS2540STRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRS2540STRPBF, 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 IRS2540STRPBF part is unused and in its original packaging.

Return procedure for IRS2540STRPBF:

1.Submit a request within 90 days.

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

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