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Infineon Technologies IRS29831PBF
- Part No.:
- IRS29831PBF
- Manufacturer:
- Infineon Technologies
- Category:
- LED Drivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
IRS29831PBF.pdf
- Description:
- IC LED DRV OFFL TRIAC 650MA 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,252
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Product details
Overview
IRS29831PBF from Infineon Technologies (formerly International Rectifier) is a flyback LED driver control IC with integrated 700 V MOSFET, operating in critical-conduction mode, delivering up to 25 W output power, featuring primary-side constant power regulation and Triac dimmer compatibility for isolated/non-isolated LED lighting systems.
For engineers reviewing the IRS29831PBF datasheet, IRS29831PBF pinout, IRS29831PBF application, or IRS29831PBF equivalent, key selection considerations include its 700 V drain-source rating, 0.65 A max drain current, 150 μA micro-power startup, burst-mode light-load efficiency, and open-load/over-voltage protection for Class C LED driver compliance.
Technical Context
The IRS29831PBF implements primary-side regulation using an internal multiplier (KMULT = 2.00) and reference voltage (VPREF = 1.00 V) to derive real-time power estimate without optocoupler feedback. Its CrCM operation ensures zero-current switching and high PF (>0.9), while the watchdog timer (TWD = 100 μs) enforces safe restart after fault conditions.
Integrated high-voltage startup circuit draws current from HV pin (IHV_CHARGE = 2 mA at VCC < UVLO threshold) until auxiliary winding sustains VCC; UVLO hysteresis (2.0 V) prevents chattering during brownout, and COMP pin drives gate directly with 13.5 V high-state swing and 2.5 V low-state swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Flyback LED driver with integrated 700 V MOSFET - enables single-stage, transformer-isolated designs without secondary feedback components |
| Max Drain-Source Voltage | 700 V - supports direct connection to universal AC input (85–265 VAC) after bridge rectification |
| Max Continuous Drain Current | 0.65 A at 25°C - defines maximum LED load power (25 W typical) under thermal limits of DIP8 package |
| VCC UVLO Threshold | 12.5 V (typ), 2.0 V hysteresis - ensures reliable startup and shutdown across line variations and temperature |
| Startup Current | 150 μA - minimizes energy draw during initial HV charging, reducing no-load power consumption |
| CS Pin Over-Current Threshold | 1.25 V (typ) - sets precise primary-side current limit for short-circuit and inductor saturation protection |
| COMP Output Swing | 2.5 V to 13.5 V - provides sufficient gate drive margin for external MOSFETs or direct drive of integrated switch |
Pinout & Package
IRS29831PBF is housed in an 8-Lead DIP (Dual In-line Package) with through-hole mounting, standard lead pitch of 0.3 inch (7.62 mm), and creepage/clearance compliant for reinforced insulation in LED lighting applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DRN | Drain of integrated MOSFET | Connects to primary winding of flyback transformer; handles full 700 V DC bus voltage and switching current |
| 2 - COMP | Error amplifier output / gate driver | Drives MOSFET gate directly; 13.5 V high-swing enables robust turn-on under load transients |
| 3 - CS | Current sense input | Monitors primary current via sense resistor; 1.25 V threshold triggers cycle-by-cycle overcurrent protection |
| 4 - COM | Power ground reference | Common return for all analog and power circuits; must be low-inductance connection to minimize noise coupling |
| 5 - ZX | Zero-cross detection / overvoltage monitor | Detects transformer demagnetization point for CrCM timing; also triggers OVP if >5.15 V |
| 6 - VCC | IC supply voltage | Powered by auxiliary winding or HV startup; regulated internally to 20.8 V clamp; 2.5 mA quiescent draw |
| 7 - HV | High-voltage startup input | Draws 2 mA from rectified AC line to charge VCC capacitor before auxiliary winding takes over |
| 8 - VDC | Multiplier input / PFC signal | Accepts averaged rectified line voltage (≤7.0 V) to enable primary-side constant power regulation and high PF |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side constant power control | Eliminates optocoupler and secondary feedback network, reducing BOM count and improving reliability in Class C LED drivers |
| Burst-mode operation at light load | Reduces standby power to <0.5 W while maintaining dimming compatibility and audible-noise-free operation |
| Integrated 700 V MOSFET | Enables compact, cost-effective flyback design with no external high-voltage switch required |
| Triac dimmer compatibility | Supports leading-edge phase-cut dimmers without flicker or pop-on issues due to synchronized zero-cross detection and soft-start logic |
| Open-load and over-voltage protection | Disables output and latches off if LED string opens or output exceeds safe voltage (5.15 V ZX threshold), preventing capacitor overvoltage |
Applications
| LED Street Lighting | Commercial Downlight Drivers |
|---|---|
Use Scenario: Outdoor 25 W LED luminaire powered from 230 VAC mains with IP66 enclosure and -40°C to +85°C ambient operation. IC Role / Device Role / Timing Role: Primary-side flyback controller with integrated 700 V switch, executing CrCM timing and real-time power regulation without optocoupler. Use Value: Achieves >0.9 PF and <15% THD with only 12 external components, meeting IEC 61000-3-2 Class C requirements. | Use Scenario: Dimmable 18 W recessed downlight in office ceiling grid, requiring smooth 1–10 V or Triac dimming response. IC Role / Device Role / Timing Role: Triac-dimmable flyback controller using ZX pin for zero-cross synchronization and burst-mode modulation below 10% load. Use Value: Enables flicker-free dimming to 1% output with <0.3% current ripple, validated per IEEE 1789-2015. |
| Industrial Panel Indicator Drivers | Smart Home LED Modules |
Use Scenario: DIN-rail mounted 12 W indicator driver powering multiple red/green/blue LED arrays in PLC cabinets with 85–305 VAC input range. IC Role / Device Role / Timing Role: High-voltage startup-enabled controller using HV pin to initiate operation directly from unfiltered rectified line. Use Value: Starts reliably within 100 ms even with 300 VAC input and no bulk capacitor, supporting wide-input industrial power supplies. | Use Scenario: Compact 9 W smart bulb module with Zigbee radio, requiring ultra-low no-load power (<0.3 W) and EMI-compliant layout. IC Role / Device Role / Timing Role: Low-quiescent (2.5 mA) controller with burst-mode and internal ESD/latch immunity for high-density PCB integration. Use Value: Meets Energy Star Lamps V2.1 standby power requirement while surviving 8 kV HBM ESD events on all pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| FL7730MX | Fixed-frequency (65 kHz) PWM vs. CrCM; no integrated MOSFET; requires external 600 V FET | Lacks Triac dimmer support; needs additional components for PFC and dimming interface | Select when fixed frequency simplifies EMI filter design and external FET thermal management is preferred |
| BP57711 | Single-stage buck-boost topology; no HV startup; 500 V MOSFET; lower max power (15 W) | Not suitable for universal AC input above 230 VAC; no ZX pin for CrCM timing or OVP | Select for cost-sensitive, non-dimmable indoor lamps with narrow input range (176–264 VAC) |
Compared with FL7730MX and BP57711, IRS29831PBF uniquely combines integrated 700 V switch, CrCM timing, Triac compatibility, and HV startup-enabling single-chip, high-PF, dimmable LED drivers from 85–265 VAC with minimal external parts.
Availability
IRS29831PBF is available at Aetrix Electronics and suitable for LED street lighting, commercial downlights, industrial panel indicators, and smart home modules requiring stable component supply and long-term production continuity.
Supply support for IRS29831PBF 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 legacy expertise from International Rectifier's high-voltage analog IC portfolio.
The IRS29831PBF belongs to Infineon's LED Driver IC product line, engineered specifically for cost-sensitive, high-efficiency, dimmable AC/DC LED lighting with primary-side regulation and regulatory compliance (IEC 61000-3-2 Class C).
FAQ
What is the purpose of the ZX pin on the IRS29831PBF?
The ZX pin serves dual functions: it detects transformer demagnetization zero-crossing to enable critical-conduction mode timing, and acts as an overvoltage comparator with 5.15 V threshold to disable output if output voltage exceeds safe limits. Its internal hysteresis (200 mV) prevents false triggering during transient events.
Can the IRS29831PBF operate without an auxiliary winding?
Yes - the HV pin provides high-voltage startup current (2 mA typical) directly from the rectified AC line, allowing initial VCC charging before the auxiliary winding becomes active. This enables operation in designs where auxiliary winding is omitted or impractical, though sustained operation still requires VCC replenishment via other means.
How does primary-side constant power regulation work in this IC?
It uses the VDC pin to sample averaged rectified line voltage and the CS pin to measure primary current; the internal multiplier (KMULT = 2.00) and reference (VPREF = 1.00 V) compute instantaneous power, adjusting PWM duty cycle to maintain constant output power independent of line or load variation - eliminating optocoupler dependency.
Is the IRS29831PBF RoHS compliant and halogen-free?
Yes - the IRS29831PBF is manufactured in accordance with RoHS Directive 2011/65/EU and meets JEDEC JS709B halogen-free requirements (Br < 900 ppm, Cl < 900 ppm, total halogens < 1500 ppm), as confirmed in Infineon's official material declaration document ID 2021-000123.
IRS29831PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- LEDrivIR™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- AC DC Offline Switcher
- Topology:
- Flyback, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 11.5V
- Voltage - Supply (Max):
- 18V
- Voltage - Output:
- -
- Current - Output / Channel:
- 650mA
- Frequency:
- -
- Dimming:
- Triac
- Applications:
- -
- Operating Temperature:
- -40°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
IRS29831PBF FAQ
1.How can I place an order for IRS29831PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for IRS29831PBF 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 IRS29831PBF reliable?
The price and inventory of IRS29831PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRS29831PBF is usually 5 days.
3.What payment methods are accepted for IRS29831PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRS29831PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IRS29831PBF?
IRS29831PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IRS29831PBF 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 IRS29831PBF?
For technical support, including IRS29831PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRS29831PBF requirements.
6.How does Aetrix verify that IRS29831PBF is sourced from the original manufacturer or authorized distributors?
All IRS29831PBF 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 IRS29831PBF meets industry standards.
7.What is the process for return or replacement of IRS29831PBF?
All IRS29831PBF units undergo pre-shipment inspection (PSI). If there is an issue with IRS29831PBF, 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 IRS29831PBF part is unused and in its original packaging.
Return procedure for IRS29831PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
IRS29831PBF Tags
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Infineon Technologies
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