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Infineon Technologies IRS21571DSPBF
- Part No.:
- IRS21571DSPBF
- Manufacturer:
- Infineon Technologies
- Category:
- Lighting, Ballast Controllers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IRS21571DSPBF.pdf
- Description:
- IC BALLAST CNTRL 48.3KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,614
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Product details
Overview
IRS21571DSPBF from Infineon Technologies (formerly International Rectifier) is a fully integrated 600V half-bridge ballast control IC for rapid-start fluorescent lamp drivers. It features programmable preheat time (via RPH/CPH), ignition ramp (via CRAMP), deadtime (via RDT), and running frequency (via RT/CT); includes integrated 600V level-shifting gate driver, bootstrap MOSFET, and 15.6V zener clamp on VCC; used in electronic ballasts for T5/T8 lamps.
For engineers reviewing the IRS21571DSPBF datasheet, IRS21571DSPBF pinout, IRS21571DSPBF application, or IRS21571DSPBF equivalent, key selection criteria include its 46 kHz oscillator frequency ±5%, 0.2V current-sense threshold synchronized to LO falling edge, thermal shutdown at 160°C, 180 mA HO source / 260 mA LO sink drive capability, and SOIC-16 narrow-body package compatibility with high-voltage lamp control topologies.
Technical Context
The IRS21571DSPBF implements a variable-frequency, 50% duty-cycle oscillator with external CT/RT programming and adjustable deadtime via RDT. Its protection architecture includes lamp filament sensing (CPH pin), failure-to-strike detection, low-line (VDC pin) and under-resonance operation lockout, and automatic restart after lamp replacement.
It integrates a bootstrap MOSFET to supply high-side gate drive, a 15.6V zener clamp on VCC to regulate supply voltage, and latch-immune ESD protection (HBM Class 3A) on all pins. The CS pin uses a 0.2V threshold referenced to the falling edge of LO for precise overcurrent detection during switching transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 46 kHz ±5% - sets base switching frequency for lamp preheat and run modes |
| High-Side Drive Current | 180 mA typical - sufficient to charge external high-side MOSFET gate capacitance rapidly |
| Low-Side Drive Current | 260 mA typical - ensures fast turn-off of low-side switch under load |
| Current Sense Threshold | 0.2 V synchronized to LO falling edge - enables accurate cycle-by-cycle overcurrent protection |
| VCC Zener Clamp Voltage | 15.6 V nominal - protects internal circuitry from overvoltage when powered from unregulated supplies |
| Thermal Shutdown Temp | 160 °C - disables outputs and latches fault until SD pin or VCC is cycled |
| Start-up Current | 150 µA typical - minimizes power draw during initial AC line application |
Pinout & Package
IRS21571DSPBF is housed in a 16-lead narrow-body SOIC package (SOIC-16N), JEDEC MS-012AC compliant, MSL2 rated, with creepage/clearance suitable for 600V floating high-side operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HO | High-side gate driver output | Drives external high-side MOSFET gate; referenced to VS, capable of 600V offset |
| LO | Low-side gate driver output | Drives external low-side MOSFET gate; referenced to COM, rail-to-rail swing |
| VS | High-side floating supply return | Source node of high-side switch; defines reference for HO output and bootstrap charging path |
| VB | High-side floating supply input | Connects to bootstrap capacitor; supplies gate drive energy for HO output |
| COM | Power ground reference | Common return for LO, VCC, CS, SD, and low-side current paths |
| VCC | Logic and level-shift supply | Internally clamped at 15.6 V; powers control logic, oscillator, and gate driver bias circuits |
| CS | Current sense input | 0.2 V threshold tied to LO falling edge; detects overcurrent in lamp or resonant tank |
| SD | Shutdown control input | Active-high; latches off outputs when >2.2 V; reset by cycling low or VCC UVLO |
| RPH | Preheat timing resistor input | Sets preheat duration and frequency via external resistor; current sourced during preheat mode |
| RUN | Run-mode timing resistor input | Sets operating frequency during lamp run; current sourced during steady-state operation |
| RT | Oscillator timing resistor | Primary frequency-setting element; combined with CT to define fOSC = 1/(RT × CT) |
| CT | Oscillator timing capacitor | Charged/discharged by RT current to generate sawtooth waveform for oscillator |
| CPH | Capacitive preheat/ignition monitor | Charged by RPH; voltage threshold (4.0 V ignition / 5.0 V run) controls mode transition |
| VDC | Rectified line voltage monitor | Detects low-line condition (3.1 V threshold); prevents operation below safe AC input range |
| DT | Deadtime programming input | Resistor-connected pin that sets non-overlap time between HO and LO transitions |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap MOSFET | Eliminates need for external bootstrap diode and reduces board space in half-bridge lamp drivers |
| Lamp filament sensing (CPH) | Enables controlled preheat by monitoring cathode heating before ignition, preventing premature lamp strike |
| Failure-to-strike protection | Shuts down after fixed timeout if lamp fails to ignite, avoiding repeated high-voltage stress on components |
| Programmable ignition ramp (CRAMP) | Smoothly increases lamp voltage during ignition phase to reduce acoustic noise and electrode wear |
| Thermal overload protection | Halts operation at 160°C junction temperature and holds fault state until explicit reset |
Applications
| Fluorescent Lamp Ballast | T5/T8 Rapid-Start Lighting |
|---|---|
Use Scenario: Electronic ballast driving linear fluorescent lamps in commercial office lighting fixtures. IC Role / Device Role / Timing Role: Half-bridge controller managing preheat, ignition, and run phases with adaptive frequency control. Use Value: Enables compliance with IEC 61000-3-2 harmonic limits and extends lamp life via controlled cathode heating. | Use Scenario: Slim-profile LED-compatible retrofit ballast for legacy T5/T8 lamp sockets. IC Role / Device Role / Timing Role: Primary timing and protection controller coordinating MOSFET gate drive, current sensing, and thermal management. Use Value: Supports dimming compatibility and reduces audible noise through programmable ignition ramp and deadtime. |
| Industrial Fluorescent Fixtures | UV-C Germicidal Lamp Driver |
Use Scenario: High-reliability ballast in factory floor lighting exposed to voltage sags and thermal cycling. IC Role / Device Role / Timing Role: Fault-tolerant controller with low-line detection, thermal shutdown, and automatic restart on lamp replacement. Use Value: Maintains uptime by detecting failed lamps and reinitializing without manual intervention. | Use Scenario: Specialized driver for mercury-vapor UV-C lamps requiring precise preheat and high-voltage ignition. IC Role / Device Role / Timing Role: Resonant half-bridge controller delivering controlled 600V+ ignition pulses and stable run frequency. Use Value: Prevents quartz envelope cracking via soft-start ignition and avoids electrode sputtering with filament sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fluorescent ballast control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRS21572DSPBF | Includes built-in zero-crossing detection and enhanced EMI reduction features; identical pinout and core functionality | Preferred for new designs targeting lower conducted emissions in lighting systems with TRIAC dimming | Select when zero-crossing synchronization is required for dimmer compatibility |
| UCC3961D | Lower voltage rating (500V), no integrated bootstrap MOSFET, requires external diode; different oscillator architecture | Suitable for cost-sensitive, lower-power (<20W) ballasts where 600V isolation margin is not mandatory | Choose only if system VBUS remains <450V and board space allows external bootstrap diode |
Compared with IRS21572DSPBF, the IRS21571DSPBF lacks zero-crossing detection but offers identical protection and timing flexibility at lower BOM cost; versus UCC3961D, it delivers higher voltage robustness and integration, enabling simpler, more reliable 600V lamp driver designs.
Availability
IRS21571DSPBF is available at Aetrix Electronics and suitable for fluorescent lamp ballasts, T5/T8 lighting systems, industrial fixture control, and UV-C germicidal drivers requiring stable component supply across extended production cycles.
Supply support for IRS21571DSPBF 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 solutions, with deep expertise in high-voltage IC design and reliability validation.
The IRS2157x family was developed specifically for self-oscillating, digitally enhanced fluorescent lamp ballasts-emphasizing programmable timing, integrated protection, and reduced external component count in compact lighting modules.
FAQ
What is the function of the CPH pin in IRS21571DSPBF?
The CPH pin monitors lamp filament preheat status via an externally charged capacitor. During preheat, RPH sources current into CPH until it reaches 4.0 V (ignition threshold), triggering the ignition ramp. In run mode, CPH voltage rises to 5.0 V to confirm stable lamp operation. This dual-threshold sensing prevents premature striking and ensures adequate cathode heating.
How does the IRS21571DSPBF handle low-line conditions?
The IRS21571DSPBF uses the VDC pin to monitor rectified AC line voltage. When VDC falls below 3.1 V (typical), the IC inhibits ignition and enters low-line protection mode, preventing unreliable lamp starting and potential component stress. Recovery occurs automatically once VDC exceeds 5.2 V, allowing seamless resumption of normal operation.
Can IRS21571DSPBF drive both N-channel and P-channel high-side switches?
No-the IRS21571DSPBF is designed exclusively for N-channel high-side MOSFETs in a half-bridge configuration. Its integrated bootstrap MOSFET and level-shifting architecture assume N-channel topology with source-connected VS node. Driving P-channel devices would require incompatible gate polarity and lacks supporting circuitry or characterization in the datasheet.
What is the recommended minimum deadtime resistance for stable operation?
The datasheet specifies RDT ≥ 1.0 kΩ for proper deadtime setting. Using less than 1.0 kΩ risks insufficient non-overlap time between HO and LO, increasing shoot-through risk in the external half-bridge. At 6.1 kΩ (typical), deadtime is 2.3 µs; values up to 50 kΩ extend deadtime linearly while maintaining oscillator stability and propagation delay integrity.
IRS21571DSPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
IRS21571DSPBF FAQ
1.How can I place an order for IRS21571DSPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRS21571DSPBF 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 IRS21571DSPBF reliable?
The price and inventory of IRS21571DSPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRS21571DSPBF is usually 5 days.
3.What payment methods are accepted for IRS21571DSPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRS21571DSPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRS21571DSPBF?
IRS21571DSPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRS21571DSPBF 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 IRS21571DSPBF?
For technical support, including IRS21571DSPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRS21571DSPBF requirements.
6.How does Aetrix verify that IRS21571DSPBF is sourced from the original manufacturer or authorized distributors?
All IRS21571DSPBF 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 IRS21571DSPBF meets industry standards.
7.What is the process for return or replacement of IRS21571DSPBF?
All IRS21571DSPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRS21571DSPBF, 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 IRS21571DSPBF part is unused and in its original packaging.
Return procedure for IRS21571DSPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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