購囚簡?窮坿砿尖 LED駁強匂 LED孚苧 HV980550W
扮寂?2016年03月24日 09:46:38 恬宀?Microchip 栖坿?嶄窮利
Microchip巷望議HV9805頁喘噐宥喘LED孚苧議LED駁強匂,恷寄孔楕120VAC扮葎25W,230VAC扮葎50W,孔楕咀殆灸撰葎98%,灸侏丼楕葎90%,斤LED嗤狛儿隠擦.云猟初府阻HV9805麼勣蒙來,崇夕,灸侏哘喘窮揃參式230VAC宣?LED駁強匂得浩医麼勣蒙來,窮揃夕,可創賠汽才PCB譜柴夕.
The HV9805 driver integrated circuit (IC) is targeted atgeneral LED lighting products, such as LED lamps andLED lighting fixtures with a maximum power rating ofabout 25W at 120VAC and about 50W at 230VAC.
A two-stage topology provides true constant currentdrive for the LED load while drawing mains power withhigh power factor. The first stage, a boundaryconduction mode boost converter, transfers powerfrom the AC line to a second stage with high powerfactor and high efficiency. The second stage,a linearregulator arranged for operation with low overheadvoltage, transfers power from the first stage to the LEDload with true constant current and protects the LEDload from overvoltage that may pass from mains to theoutput of the first stage.
The IC is particularly geared to drive a high voltageLED load. An LED load arranged as a high-voltage loadis capable of offering cost advantages in terms of heatmanagement and optics.
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