STMicroelectronics LED bulbs with drive IC MOSFET

STMicroelectronics joint venture STMicroelectronics (STMicroelectronics) listed small LED lighting driver IC HVLED805". The IC is used in a flyback AC-DC converter with a single side of the insulation, integrated on a chip PWM control IC and +800V power MOSFET. The current in the primary side can be detected without the use of a current sense resistor, so that the current supplied to the LED can be stabilized, so that the current sensing resistor and the optical coupler which are normally used on the two side are not needed. According to STMicroelectronics, which can not only reduce the cost of components, but also improve reliability.

PWM control IC feedback circuit control using current mode. The zero voltage switching (ZVS:zero voltage switching) is realized by quasi resonant technique. As a result, the efficiency of the radiation noise (EMI) can be greatly reduced. The maximum switching frequency is 166kHz. The utility model also has the function of automatically reducing the switching frequency when the load is reduced, so as to prevent the conversion efficiency from reducing. Even if the switching frequency is reduced, the ZVS operation can be ensured. The current error supplied to LED is only 5%. Supply voltage is +11.5 ~ 23V.

According to STMicroelectronics, the sale of the product is equipped with the use of high-voltage power lines from the import of electricity to start the start-up circuit IC. Also available for LED short circuit and open circuit protection function. SO16N 4mm 10mm * 1.75mm is used as the package. Working joint temperature range of -40 ~ +150 C. Buy 10 thousand when the price is $0.70. Also have a special price for a large number of procurement.