目录
1.产品概述                   2.产品特点
3.应用范围                       4.产品封装图
5  产品PCB                      6.电路原理图
7.产品BOM                       8产品PDF文档  

9.产品设计概述

1.产品概述(DESCRIPTION)
         HM9921, HM9922, HM9923 are high-voltage LED driver control ICs with build-in MOSFET switch
and purposed for LED lighting control.
         They allow efficient operation of LED strings from voltage sources ranging up to 400VDC.
The HM9921/2 includes an internal high-voltage switching MOSFET controlled with fixed off-time
TOFF of approximately 10µs. The LED string is driven at constant current, thus providing constant
light output and enhanced reliability. The output current is internally fixed at 20mA for HM9921,
50mA for HM9922 and 30mA for HM9923. The peak current control scheme provides good regulation
of the output current throughout the universal AC line voltage range of 85 to 264V AC or DC input
voltage of 20 to 400V.

2.产品特点

(1)Operating temperature range -40 ..+85 ºС.
(2.)ON-resistance of the MOSFET switch210 Ohm for ambient temperature 25 ºС
(3) OFF-state breakdown voltage of the MOSFET switch not less 500 V for  Ambient temperature 25 ºC.

3.应用范围(Applications:)
   (1)Led lamps with AC or DC operation
   (2)LED decoration

4.产品封装图



5  产品PCB 



6.电路原理图


              

7.产品BOM