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STMicroelectronics VK05CFLTR-E
- Part No.:
- VK05CFLTR-E
- Manufacturer:
- STMicroelectronics
- Category:
- Lighting, Ballast Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
VK05CFLTR-E.pdf
- Description:
- IC CCFL DRIVER 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,072
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Product details
Overview
VK05CFLTR-E from STMicroelectronics is a monolithic high-voltage cascode driver IC for compact fluorescent lamp (CFL) ballasts, integrating an NPN Darlington and low-voltage MOSFET in emitter-switching topology, 520 V collector-source breakdown voltage, 1.5 A peak collector current, and built-in diac trigger function for self-oscillating half-bridge operation.
For engineers reviewing the VK05CFLTR-E datasheet, VK05CFLTR-E pinout, VK05CFLTR-E application, or VK05CFLTR-E equivalent, key selection criteria include its dual high-side/low-side capability in CFL inverters, external capacitor–set nominal frequency (e.g., ~35 kHz with 1.2 nF), integrated antiparallel source diode, and SO-8 thermal performance (Rthj-lead = 15 °C/W).
Technical Context
The VK05CFLTR-E implements ST's VIPower M3-3 technology to co-integrate control logic and power stage in a single SO-8 die. Its cascode architecture combines bipolar high-voltage switching (520 V BVCES) with MOSFET speed, enabling self-oscillating operation without saturable transformers.
It supports dual configuration: as high-side driver (diac pin tied to midpoint) or low-side driver (diac pin tied to source). The sec pin senses secondary winding voltage for supply and triggering, while osc pin sources ~300 µA to charge external timing capacitors C5/C6-setting steady-state frequency independently of ignition behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 520 V collector-source rating enables direct connection to 230 VAC rectified rails with margin. |
| Peak Collector Current | 1.5 A supports lamp ignition surges up to 23 W CFL loads. |
| Osc Pin Current | 300 µA typical output sets precise RC-based working frequency without external bias circuitry. |
| Diac Threshold | 31 V typical turn-on threshold ensures reliable cold-start ignition across temperature. |
| Junction Temp Range | −40 °C to +150 °C operation suits enclosed CFL ballast environments with limited airflow. |
| Rthj-lead | 15 °C/W enables direct PCB copper pad heat sinking-critical for sustained 0.25 A RMS conduction. |
Pinout & Package
Package: SO-8 (standard 150 mil width), 1.27 mm pitch, with exposed thermal pad (not electrically connected); Rthj-amb = 52 °C/W on 100 mm² FR-4 copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 (Collector) | High-voltage NPN collector terminals | Internally paralleled pins handle full load current path; must connect to lamp choke primary. |
| 5 (sec) | Secondary winding input / supply sense | Receives feedback voltage from transformer secondaries to power device and detect zero-crossing. |
| 6 (osc) | Timing capacitor charging output | Sources constant ~300 µA to set nominal operating frequency; discharges internally at fixed threshold. |
| 7 (diac) | Diac trigger input | Accepts voltage ramp from external RC network; initiates start-up when threshold (~31 V) is reached. |
| 8 (Source) | MOSFET source / ground reference | Common return for low-side configuration; ties to system ground or midpoint in high-side layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated diac function | Eliminates discrete diac and associated timing resistor-reduces BOM count and start-up drift. |
| Antiparallel source diode | Enables freewheeling current path during dead time without external diode, improving efficiency and layout density. |
| Self-oscillating topology support | Removes need for external oscillator IC or transformer saturation sensing-simplifies 2-device H-bridge CFL design. |
| Configurable high/low-side use | Single part number serves both legs of half-bridge: diac-to-source for LSD, diac-to-midpoint for HSD. |
| Ignition vs. steady-state frequency decoupling | External C5/C6 sets stable run frequency (~35 kHz), while resonance during preheat enables reliable lamp strike. |
Applications
| Electronic CFL Ballasts | 230 VAC Residential Lighting |
|---|---|
|
Use Scenario: Driving 5–23 W compact fluorescent lamps in self-ballasted fixtures with integrated EMI filtering. IC Role / Device Role / Timing Role: Half-bridge power switch controlling resonant tank current; provides diac-triggered start-up and RC-set steady-state oscillation. Use Value: Enables single-chip dual-driver solution with no external oscillator, reducing component count by ≥4 vs. discrete alternatives. |
Use Scenario: European-market plug-and-play CFL retrofit lamps operating directly from 230 VAC mains after bridge rectification. IC Role / Device Role / Timing Role: High-side/low-side driver pair managing lamp preheat, ignition, and regulation via secondary feedback. Use Value: Supports wide power range (5–23 W) using same board layout via capacitor value changes-accelerates variant development. |
| 110 VAC Commercial Fixtures | Lamp Pre-heat Control |
|
Use Scenario: North American office lighting systems requiring UL-compliant 110 VAC input with PTC-free preheating. IC Role / Device Role / Timing Role: Low-side driver initiating controlled filament heating before high-voltage strike using internal diac ramp. Use Value: Replaces PTC thermistors with solid-state timing-improves reliability and lifetime consistency across 10,000+ hour lamp cycles. |
Use Scenario: High-reliability CFL ballasts where filament stress must be minimized prior to ignition. IC Role / Device Role / Timing Role: Sec pin monitors secondary voltage decay to dynamically extend preheat duration based on lamp aging. Use Value: Extends lamp life by >25% versus fixed-time preheat, confirmed in ST application note AN2197. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CFL driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IRS2166DSTRPBF | Half-bridge gate driver with bootstrap supply; requires external HV transistors and diac circuit. | Supports higher power (>30 W) but adds 6+ external components and layout complexity. | Choose when scaling beyond 23 W or needing programmable dead time. |
| KA7538A | Discrete diac + transistor driver IC; no integrated power switch or antiparallel diode. | Limited to low-power (<10 W) due to lower 1.2 A peak current and no cascode thermal advantage. | Choose only for cost-sensitive <10 W designs where SO-8 footprint is not required. |
Compared with IRS2166DSTRPBF and KA7538A, the VK05CFLTR-E delivers full integration-reducing bill-of-materials by up to 9 components-while maintaining 520 V robustness and SO-8 thermal performance essential for sealed CFL modules.
Availability
VK05CFLTR-E is available at Aetrix Electronics and suitable for electronic CFL ballasts, 230 VAC residential lighting, 110 VAC commercial fixtures, and lamp pre-heat control requiring stable component supply across global lighting OEM programs.
Supply support for VK05CFLTR-E 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The VK05CFLTR-E belongs to ST's VIPower M3 family-engineered specifically for high-voltage AC-DC and resonant lighting control, emphasizing integration, thermal resilience, and self-oscillating simplicity in space-constrained ballasts.
FAQ
What is the maximum lamp power supported by VK05CFLTR-E?
The VK05CFLTR-E is validated for 5–23 W compact fluorescent lamps per STMicroelectronics application documentation. At 23 W, it operates with 0.25 A RMS collector current and junction temperature ≤125 °C on standard FR-4 with 100 mm² copper, meeting EN61000-3-2 harmonic limits without derating.
Can VK05CFLTR-E drive lamps without a preheat phase?
Yes-the VK05CFLTR-E supports instant-start operation using its diac-triggered ignition. However, ST recommends preheat (via PTC or low-voltage network) to extend lamp life; the device's sec pin monitoring allows dynamic preheat extension if secondary voltage decay indicates aging filaments.
How does the osc pin set frequency without affecting ignition?
The osc pin sources a constant 300 µA current to charge external capacitors C5/C6; frequency is determined by the RC time constant and internal turn-off threshold (~2 V). Ignition relies on resonant Lp–C4 behavior at higher frequency-decoupled because the osc circuit only engages after initial conduction stabilizes.
Is VK05CFLTR-E still in active production?
VK05CFLTR-E is marked "Obsolete Product(s)" in ST's official datasheet revision December 2003. Aetrix Electronics maintains legacy inventory with full traceability and offers engineering support for drop-in replacements including ST's newer VIPower M0-7 series drivers where feasible.
VK05CFLTR-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- CCFL Driver
- Frequency:
- -
- Voltage - Supply:
- -
- Current - Supply:
- 1.5 A
- Current - Output Source/Sink:
- 1.5A
- Dimming:
- No
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
VK05CFLTR-E FAQ
1.How can I place an order for VK05CFLTR-E through Aetrix?
Please submit a Request for Quotation (RFQ) for VK05CFLTR-E 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 VK05CFLTR-E reliable?
The price and inventory of VK05CFLTR-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VK05CFLTR-E is usually 5 days.
3.What payment methods are accepted for VK05CFLTR-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VK05CFLTR-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VK05CFLTR-E?
VK05CFLTR-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VK05CFLTR-E 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 VK05CFLTR-E?
For technical support, including VK05CFLTR-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VK05CFLTR-E requirements.
6.How does Aetrix verify that VK05CFLTR-E is sourced from the original manufacturer or authorized distributors?
All VK05CFLTR-E 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 VK05CFLTR-E meets industry standards.
7.What is the process for return or replacement of VK05CFLTR-E?
All VK05CFLTR-E units undergo pre-shipment inspection (PSI). If there is an issue with VK05CFLTR-E, 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 VK05CFLTR-E part is unused and in its original packaging.
Return procedure for VK05CFLTR-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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