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

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Errata Sheet
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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

线路 图表

图案 资源


Technical Documentation

Product Specifications

描述 版本 大小
DS6988: Off-line LED driver with primary-sensing
1.1 473 KB

Application Notes

描述 版本 大小
AN3360: 3.2 W LED power supply based on HVLED805
2.2 2,872 KB

Presentations & Training Material


描述 版本 大小
HVLED805 offline LED driver
1.0.0 296 KB

Related Tools and Software

Related Tools and Software

产品型号 描述
STEVAL-ILL037V1 3.2 W LED power supply based on HVLED805
EVALHVLED805 HVLED805 based evaluation board: 4.2 W isolated LED driver with primary side current regulation

样品 & 购买

产品型号 Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
HVLED805NRNDSO-16Tube_-.426Distributor reported inventory date: 2015-11-28
Distributor NameRegionStockMin. order
Farnell Element14Order NowEUROPE1601
HVLED805TRActiveSO-16Tape And Reel_-.426No availability reported, please contact our Sales officeEcopack2-

(*) 建议零售价格仅用于预算,以美元为单位,每。的报价,以当地货币计算的价格,请联系您当地的 ST 销售办事处 或我们的 分销商
(**) 材料声明表格上提供st.com可以是一般的文件,根据最常用的包,包内的家庭。出于这个原因,他们可能不是100%准确,对于一个特定的设备。请联系我们 销售支持 在特定设备上的信息。
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