ST Life.augmented

HVLED805

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

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.

pdf Please read
Errata Sheet
pdf Download
Datasheet

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

Design Resources

Top

Technical Documentation

Product Specifications

Description Version Size
pdf
DS6988: Off-line LED driver with primary-sensing
1.1 473 KB

Application Notes

Description Version Size
pdf
AN3360: 3.2 W LED power supply based on HVLED805
2.2 2,872 KB

Presentations & Training Material

Presentations

Description Version Size
pdf
HVLED805 offline LED driver
1.0.0 296 KB

Related Tools and Software

Related Tools and Software

Part Number Description
EVALHVLED805 HVLED805 based evaluation board: 4.2 W isolated LED driver with primary side current regulation
STEVAL-ILL037V1 3.2 W LED power supply based on HVLED805

Publications and Collaterals

Flyer

Description Version Size
pdf
HVLED805 on -chip solution for LED driving
1.0 3,385 KB

Conference Paper

Description Version Size
pdf
Single stage Offline LED driver - IEEE
1.0 774 KB

Sample & Buy

Top
Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
HVLED805ActiveSO-16Tube_-.426Distributor reported inventory date: 2014-04-23
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA10001000
Farnell Element14Order NowEUROPE1621
Ecopack2-
HVLED805TRActiveSO-16Tape And Reel_-.426Distributor reported inventory date: 2014-04-23
Distributor NameRegionStockMin. order
AVNETOrder NowAMERICA25000
Ecopack2-

(*) 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
(**) 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.
Feedback Form
Customer Feedback