Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Lighting, Ballast Controllers

Infineon Technologies IRS21571DSTRPBF

Name: IRS21571DSTRPBF
Brand: Infineon Technologies
SKU: IRS21571DSTRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: IRS21571DSTRPBF

Manufacturer:: Infineon Technologies

Category:: Lighting, Ballast Controllers

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: IRS21571DSTRPBF.pdf

Description:: IC BALLAST CNTRL 48.3KHZ 16SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,786

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

IRS21571DSTRPBF from Infineon (formerly International Rectifier) is a fully integrated 600V half-bridge ballast control IC for rapid-start fluorescent lamp drivers. It features programmable preheat time (43.7–48.3 kHz oscillator), ignition ramp, 0.2V current-sense threshold synchronized to LO falling edge, thermal shutdown at 160°C, and integrated 15.6V zener clamp on VCC. Used in electronic ballasts for T5/T8 lamps in commercial lighting fixtures.

For engineers reviewing the IRS21571DSTRPBF datasheet, IRS21571DSTRPBF pinout, IRS21571DSTRPBF application, or IRS21571DSTRPBF equivalent, key selection criteria include V_BS = 600V offset capability, IO+ = 180 mA / IO− = 260 mA gate drive strength, programmable deadtime via R_DT, lamp filament sensing via CPH/RPH, and fault-latched shutdown with SD pin reset.

Technical Context

The IRS21571DSTRPBF implements a variable-frequency, 50% duty-cycle oscillator with external RT/CT programming and programmable deadtime via R_DT. Its protection architecture includes synchronous current-sense (V_CS+ = 1.1 V, t_cs = 400 ns), low-line detection (V_DC− = 3.1 V), and thermal shutdown (T_SD = 160°C) with latch-off behavior requiring SD pin or VCC cycling.

It integrates a bootstrap MOSFET and level-shifting high-side driver for direct half-bridge FET control, with V_HO/V_LO outputs referenced to VS and COM respectively. The VCC rail incorporates a 15.6V zener clamp, requiring regulated supply current ≥10 mA to maintain regulation without exceeding power dissipation limits in SOIC-16 (P_D = 1.25 W).

Key Specifications

Parameter	Value and Actual Design Meaning
Topology	Half-bridge ballast controller with integrated 600V level-shifting gate driver
V_OFFSET	600 V max floating supply offset (VS to VB), enabling direct high-side FET drive in AC line-referenced topologies
Oscillator f_OSC	46 kHz typical ±5%, externally set by RT/CT; supports preheat, ignition, and run modes with distinct frequency profiles
I_O+/I_O−	180 mA source / 260 mA sink output drive strength, sufficient for driving 1–2 A half-bridge IGBTs/MOSFETs with <220 ns rise/fall times
V_CS+ Threshold	1.1 V typical with 250–400 ns propagation delay, synchronized to LO falling edge for accurate lamp current foldback during strike failure
T_SD	160°C junction thermal shutdown with latch-off behavior; requires SD pin toggle or VCC UVLO reset to recover
V_CLAMP	15.6 V internal zener on VCC pin; mandates minimum 10 mA supply current to sustain regulation and avoid overvoltage stress

Pinout & Package

IRS21571DSTRPBF is housed in a 16-lead narrow-body SOIC package (SOIC-16N), JEDEC MS-012AC compliant, MSL2 rated, with 100 °C/W junction-to-ambient thermal resistance under still-air conditions.

Pin/Terminal	Circuit Role	Design Meaning
1 (VB)	High-side floating supply	Connects to bootstrap capacitor top node; must withstand 600 V offset relative to VS
2 (VS)	High-side floating return	Reference for HO output and VB supply; tied to half-bridge switch node
3 (HO)	High-side gate driver output	Drives gate of upper FET/IGBT; 180 mA source, 260 mA sink, referenced to VS
4 (COM)	Low-side ground reference	Return for LO, VCC, CS, SD, and all logic inputs; common to rectified line neutral
5 (LO)	Low-side gate driver output	Drives gate of lower FET/IGBT; 260 mA sink, referenced to COM
6 (VCC)	Logic supply input	15.6 V zener-clamped rail; requires ≥10 mA regulated current to sustain operation
7 (SD)	Shutdown control input	Active-high latch-disable; >2.2 V triggers fault lockout; hysteresis = 395 mV
8 (CS)	Current sense input	0.2 V threshold synced to LO falling edge; detects lamp current faults with 400 ns response
9 (RPH)	Preheat timing resistor	Sets preheat duration and frequency; current sourced into pin during preheat mode
10 (RRUN)	Run-mode timing resistor	Sets operating frequency during steady-state; current sourced during run mode
11 (RT)	Oscillator timing resistor	Primary frequency-setting pin; total current (RPH + RT or RRUN + RT) must be 50–500 µA
12 (CT)	Oscillator timing capacitor	470 pF typical; sets ramp slope and frequency along with RT; voltage swing 2.0–4.0 V
13 (CPH)	Lamp filament sense input	Monitors cathode heating; 4.0 V ignition threshold, 5.0 V run threshold, 0 V fault state
14 (DT)	Deadtime programming resistor	6.1 kΩ typical; sets HO/LO non-overlap time (~2.3 µs); prevents shoot-through
15 (VDC)	Rectified line voltage monitor	Detects low-line condition; thresholds at 3.1 V (lower) and 5.2 V (upper)
16 (RAMP)	Ignition ramp control	Programs voltage ramp rate during lamp ignition phase to prevent acoustic resonance

Key Features

Feature	Design Value
Programmable preheat & ignition ramp	Enables reliable cold-start of T5/T8 lamps across temperature extremes without filament damage
Lamp filament sensing (CPH/RPH)	Verifies cathode heating before ignition, preventing open-circuit strike attempts that degrade electrodes
Synchronous current-sense (0.2 V @ LO fall)	Eliminates timing ambiguity in overcurrent detection during critical ignition phase
Integrated 600V level-shifter + bootstrap MOSFET	Removes need for external high-voltage level-shifting components and discrete bootstrap diode
Thermal shutdown with latch-off	Prevents thermal runaway in enclosed fixtures; ensures fail-safe shutdown until explicit reset

Applications

Commercial Fluorescent Fixtures

Industrial High-Bay Lighting

Use Scenario: Electronic ballast in ceiling-mounted T8 fixtures for office buildings and retail spaces.

IC Role / Device Role / Timing Role: Half-bridge controller managing preheat (60–120 s), ignition ramp (1–3 s), and 46 kHz run frequency.

Use Value: Enables flicker-free start, extends lamp life >20,000 hours, and meets IEC 61000-3-2 harmonic limits via controlled switching.

Use Scenario: High-output ballast in warehouse high-bay fixtures using T5 HO lamps.

IC Role / Device Role / Timing Role: Controls dual-lamp parallel operation with independent filament sensing per cathode.

Use Value: Prevents single-lamp failure from cascading; maintains illumination continuity while signaling fault via SD pin.

Hospitality & Educational Lighting

Emergency Lighting Systems

Use Scenario: Dimmable ballast in hotel corridors and classroom fixtures with occupancy-based control.

IC Role / Device Role / Timing Role: Supports analog dimming via RUN pin current modulation and automatic restart after lamp replacement.

Use Value: Delivers smooth 10–100% light output control without audible noise or lamp instability.

Use Scenario: Self-contained emergency ballast with battery backup and auto-test functionality.

IC Role / Device Role / Timing Role: Monitors VDC for AC loss detection and initiates battery-powered preheat/run sequence.

Use Value: Meets EN 60598-2-22 requirements for 90-minute runtime and automatic monthly self-test.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fluorescent ballast control applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRS21572DSTRPBF	Same pinout and core architecture; adds dedicated V_REF output (2.5 V) for external ADC monitoring	Required where lamp current or temperature telemetry is needed for smart building integration	Select when system-level diagnostics or closed-loop lamp regulation are required
UCC3305D	Lower V_OFFSET (450 V), no integrated bootstrap MOSFET, separate high-side driver enable logic	Suitable only for lower-power (<32 W) or isolated-supply ballasts; lacks CPH filament sensing	Choose only for cost-sensitive, non-filament-sensing designs with external bootstrap circuitry

Compared with IRS21571DSTRPBF, IRS21572DSTRPBF adds diagnostic capability without sacrificing protection or drive strength, while UCC3305D reduces integration to lower BOM cost but requires additional external components and sacrifices lamp health monitoring.

Availability

IRS21571DSTRPBF is available at Aetrix Electronics and suitable for commercial lighting ballasts, industrial high-bay systems, hospitality-grade dimmable fixtures, and emergency lighting requiring stable component supply and long-term lifecycle support.

Supply support for IRS21571DSTRPBF 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 to manufacture and support its high-voltage IC portfolio for power conversion and lighting control.

The IRS2157x family was designed specifically for cost-effective, high-reliability electronic ballasts in T5/T8 fluorescent systems-emphasizing lamp life extension, acoustic noise suppression, and robust fault handling in unattended environments.

FAQ

What is the minimum VCC supply current required to operate the IRS21571DSTRPBF reliably?

The device requires ≥10 mA into the VCC pin to maintain regulation of its internal 15.6 V zener clamp. Below this, VCC drops below 12.5 V, triggering undervoltage lockout (V_CCUV+ = 12.5 V). Sustained operation at 150 µA startup current is only valid during initial power-up before oscillator activation.

How does the CPH pin function during lamp ignition and run modes?

CPH monitors lamp cathode voltage during preheat. At ignition, it must reach 4.0 V (typical) to enable ramp-up; during run mode, it must exceed 5.0 V to confirm filament integrity. If CPH falls below 50 mV in run mode, the IC enters fault latch with LO/HO disabled until SD pin reset.

Can the IRS21571DSTRPBF drive IGBTs directly, or is a MOSFET gate driver stage required?

Yes-it drives IGBTs directly. Its 180 mA HO source and 260 mA LO sink currents, combined with <220 ns rise/fall times, are sufficient for 1–2 A IGBTs with Q_g ≤ 35 nC. No external driver stage is needed unless gate charge exceeds 50 nC or layout parasitics demand higher peak current.

What happens if the RDT resistor is omitted or shorted?

Omitting RDT disables deadtime control, causing HO and LO to overlap and risk shoot-through in the half-bridge. Shorting RDT forces minimum deadtime (~0.5 µs), increasing cross-conduction losses and thermal stress. The datasheet specifies 1.0–10 kΩ; 6.1 kΩ yields 2.3 µs nominal deadtime.

IRS21571DSTRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Ballast Controller

Frequency:: 43.7kHz ~ 48.3kHz

Voltage - Supply:: 11.5V ~ 15.6V

Current - Supply:: 10 mA

Current - Output Source/Sink:: -

Dimming:: -

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

IRS21571DSTRPBF FAQ

1.How can I place an order for IRS21571DSTRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRS21571DSTRPBF 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 IRS21571DSTRPBF reliable?

The price and inventory of IRS21571DSTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRS21571DSTRPBF is usually 5 days.

3.What payment methods are accepted for IRS21571DSTRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRS21571DSTRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRS21571DSTRPBF?

IRS21571DSTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRS21571DSTRPBF 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 IRS21571DSTRPBF?

For technical support, including IRS21571DSTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRS21571DSTRPBF requirements.

6.How does Aetrix verify that IRS21571DSTRPBF is sourced from the original manufacturer or authorized distributors?

All IRS21571DSTRPBF 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 IRS21571DSTRPBF meets industry standards.

7.What is the process for return or replacement of IRS21571DSTRPBF?

All IRS21571DSTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRS21571DSTRPBF, 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 IRS21571DSTRPBF part is unused and in its original packaging.

Return procedure for IRS21571DSTRPBF:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…