Off-line LED driver with primary-sensing up to 5W

The HVLED805 is a high-voltage primary switcher intended for operating directly from the rectified mains with minimum external parts to provide an efficient, compact and cost effective solution for LED driving. It combines a high-performance low-voltage PWM controller chip and an 800V, avalanche-rugged power MOSFET, in the same package.

The PWM is a current-mode controller IC specifically designed for ZVS (Zero Voltage Switching) fly-back LED drivers, with constant output current (CC) regulation using primary-sensing feedback. This eliminates the need for the opto-coupler, the secondary voltage reference, as well as the current sense on the secondary side, still maintaining a good LED current accuracy. Moreover it guarantees a safe operation when short circuit of one or more LEDs occurs.

In addition, the device can also provide a constant output voltage regulation (CV): it makes the application able to work safely when the LED string opens due to a failure.

Quasi-resonant operation is achieved by means of a transformer demagnetization sensing input that triggers MOSFET’s turn-on. This input serves also as both output voltage monitor, to perform CV regulation, and input voltage monitor, to achieve mains-independent CC regulation (line voltage feed forward).

The maximum switching frequency is top-limited below 166 kHz, so that at medium-light load a special function automatically lowers the operating frequency still maintaining the operation as close to ZVS as possible. At very light load, the device enters a controlled burst-mode operation that, along with the built-in high-voltage start-up circuit and the low operating current of the device, helps minimize the residual input consumption.

Although an auxiliary winding is required in the transformer to correctly perform CV/CC regulation, the chip is able to power itself directly from the rectified mains. This is useful especially during CC regulation, where the fly-back voltage generated by the winding drops.

In addition to these functions that optimize power handling under different operating conditions, the device offers protection features that considerably increase end-product’s safety and reliability: auxiliary winding disconnection or brownout detection and shorted secondary rectifier or transformer’s saturation detection. All of them are auto restart mode.

Key Features

  • 800 V, avalanche rugged internal power MOSFET
  • 5% accuracy on constant LED output current with primary control
  • Optocoupler not needed
  • Quasi-resonant (QR) zero voltage switching (ZVS) operation
  • Internal HV start-up circuit
  • Open or short LED string management
  • Automatic self supply
  • Input voltage feed-forward for mains independent cc regulation

Circuit Diagram

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Design

Technical Documentation

Product Specifications
Description Version Size
DS6988 DS6988: Off-line LED driver with primary-sensing 1.1 472 KB
Application Notes
Description Version Size
AN3360 AN3360: 3.2 W LED power supply based on HVLED805 2.2 2 MB

Publications and Collaterals

Flyers
Description Version Size
HVLED805 on -chip solution for LED driving 2.1 3 MB
HVLED: Lighting the future 06.2016 1 MB
Brochures
Description Version Size
Brochure Power management guide 05.2016 4 MB

Tools and Software

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Sample & Buy

Part Number Marketing Status Quantity Unit Price (US$) * Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
HVLED805 NRND - - SO-16 Tube - - NEC EAR99 - MORE INFO DISTRIBUTOR AVAILABILITY
HVLED805TR Active - - SO-16 Tape And Reel - - NEC EAR99 - MORE INFO
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
HVLED805 NRNDSO-16IndustrialEcopack2
HVLED805TR ActiveSO-16IndustrialEcopack2
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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