SilergyConfidential-DonotdistributeSilergyConfidential-Donotdistribute1SY5800A—T8使用手册BySilergyCorp.SilergyConfidential-DonotdistributeSilergyConfidential-Donotdistribute2在以下的章节中,以一个T8为例来说明此IC的使用细节及一些调节中的经验:首先是此T8的工作条件:Vin:85~264VVout:36VIout:330mA输出所接LED灯数:10或11颗原理图见下页图SY5800ASilergyConfidential-DonotdistributeSilergyConfidential-Donotdistribute3CircuitDiagramD3ACinput45ISENGNDDRVVINENTMC6R1SY5800ANpNsNaux102F1DB1L1D1R13C9C5R5D2R8,9/1Q14N60CX1C1C2R4R10C10R12T2A0.1uF0.1uF0.1uFR210uF/25V10uF/25V10SS1H1010R11470K250K250K250KRS1M4.7nF/630V100KCY1C8R16220uF/63VR3R6DB107L2COMPZCS1R17Z1C15R15C4R14C11C7220uF/63V1.5mH10mH200K30KNC1K680nF10KMUR360SNCNC200KR7/2SilergyConfidential-DonotdistributeSilergyConfidential-Donotdistribute4BomListILED=320mA(SMDComponent)PartNumberReferencePartNameDescription1DB1DB107s/1R25.1K/1206/3R1,R4,R12250K/1206/1R1730K/0805/1R3200K/0805/1C4NC/1C6680nF/0805/1R61K/0805/1R11470K/0805/1R1310/1206/2C9,C1010uF/1206/25V/1C54.7nF/630V/1206/1R5100K/1206/1R1010/0805/SilergyConfidential-DonotdistributeSilergyConfidential-Donotdistribute5BomListILED=320mA(SMDComponent)PartNumberReferencePartNameDescription1R1410K/0805/1D2FR107/SMARS1M1D1SS1H10/SMA/2R9,R81Ω/0805/1R72Ω/0805/1Q14N60TO2511C15NC/1R15NC/1Z1NC/1R16200K/1206/1D3MUR360S/1C11NC/1U1SY5800A/SilergyConfidential-DonotdistributeSilergyConfidential-Donotdistribute6BomListILED=320mA(ThroughHole)PartNumberReferencePartNameDescription1F12A/250V/1MOV1NC/1CX10.1uF/250VAC/1L1EE8.3>10mH2C1,C20.1uF/400VDCCBB1L2φ6*8>1.2mH1CY1102JD102MY12C7,C8220uF/63V/1T1ER251056:21:5Lp=0.75mHSilergyConfidential-DonotdistributeSilergyConfidential-Donotdistribute7VIN脚使用注意•VIN为IC供电脚。•当IC初始启动时需要原边高压侧供电,启动后为辅助绕组供电。•初始启动时,因为原边高压侧供电,故调整启动电阻R1、R4、R12的值,可以改变启动时间;如果在低压情况下启动不了,也可以减小启动电阻R1、R4、R12得以改善。•启动后辅助绕组供电建议设置辅助绕组为11V来供电。不宜太高,建议低于12V。•若采用11V,则辅助绕组匝数Naux=Ns*11/(Vout+VDF),VDF为输出二极管压降,Ns为副边匝数。•原边绕组RCD缓冲器的D2要选择快速恢复二极管,否则可能会造成开机会输出电流随时间下降。C5电容取个nF级的高压电容,R5电阻取个百K级电阻,如,4.7nF/630V,100K•可以在D2下面接个电阻R为减小尖峰。RSilergyConfidential-DonotdistributeSilergyConfidential-Donotdistribute8COMP脚为补偿脚,此脚对地接法如下图所示:COMP脚对GND所接的补偿值的大小对IC工作较为重要。1、例如:如果在80~130V输入电压范围内调整输入电压时,输出LED灯会发生闪烁,这是由于动态调整慢的原因,此时调整COMP脚对地RC值即可,把R6调大(从1K调到2K),C6调小(从680nF调到220nF)。调整后就不会闪烁,但可能同时PFC值可能会降低,此时降低整流后的CBB电容C1,C2大小可在一定程度上提高PFC值。2、在高压220VAC或者更高时,需要PF>0.9时,增大C或者C6的容值1uF~2.2uF,即可。(如果SY5800A实际测试的时候,PF值在0.8以下的,大都是变压器问题,改变这个电容是改善不了的)3、PCB布板的时候,如果有空间足够的话,可以把C加上,方便调试使用,在实际应用中,C有时候可不加。COMP脚使用注意SilergyConfidential-DonotdistributeSilergyConfidential-Donotdistribute9ZCS脚使用注意1、ZCS脚的电压高于1.5V700ns的时候,IC将开始过压保护。故要根据辅助绕组的匝数选择合适的R3和R17的比值。调整R3和R17的值不能使ZCS的电压太低,比如1V,否则可能会过压保护起不到作用,也不能使ZCS电压太高,比如1.45V,很容易使误保护。以下准则来确定两分压电阻的比例:Vzcs1.5VzcsVo...