HVLED805 Off-line LED driver with primary-sensing
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
技术特性
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HVLED805 订购信息
| 订购型号 | 产品状态 | 美金价格 | 数量 | 封装 | 包装形式 | 温度范围 | 材料声明 |
| HVLED805 | Active | 0.746 | 1000 | SO-16 | Tube | ||
| HVLED805TR | Active | 0.746 | 1000 | SO-16 | Tape And Reel |
DATASHEET
| 描述 | 版本 | 大小 |
| HVLED805 : Off-line LED driver with primary-sensing | 1 | 451KB |
APPLICATION NOTES
| 描述 | 版本 | 大小 |
| AN3360: 3.2 W LED power supply based on HVLED805 | 2 | 2873KB |
PRODUCT PRESENTATIONS
| 描述 | 版本 | 大小 |
| Energy-efficient solutions for offline LED lighting and general illumination | 2.0.0 | 2646KB |
BOARDS AND TOOLS
| 型号 | 描述 |
| STEVAL-ILL037V1 | 3.2 W LED power supply based on HVLED805 |
| EVALHVLED805 | HVLED805 evaluation board: insulated LED driver with primary current control |
FLYERS
| 描述 | 版本 | 大小 |
| FLHVLED8051010 : HVLED805 on -chip solution for LED driving | 1.0 | 3386KB |
