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NCP1399AA 参数 Datasheet PDF下载

NCP1399AA图片预览
型号: NCP1399AA
PDF下载: 下载PDF文件 查看货源
内容描述: []
分类和应用:
文件页数/大小: 43 页 / 666 K
品牌: ONSEMI [ ONSEMI ]
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NCP1399AA, NCP1399BA, NCP1399AC  
VCC Management with High−voltage Startup Current Source  
The NCP1399 controller features a HV startup current  
source that allows fast startup time and extremely low  
standby power consumption. Two startup current levels  
failure mode that may occur in the application. The HV  
startup current source is primarily enabled or disabled based  
on V level. The startup HV current source can be also  
CC  
(I  
and I  
) are provided by the system for safety in  
enabled by BO_OK rising edge, auto−recovery timer end,  
REMote and TSD end event. The HV startup current source  
charges the VCC capacitor before IC start−up.  
start1  
start2  
case of short circuit between VCC and GND pins. In  
addition, the HV startup current source features a dedicated  
over−temperature protection to prevent IC damage for any  
Figure 37. Internal Connection of the VCC Management Block  
The NCP1399 controller disables the HV startup current  
Figure 65 to find an illustration of the NCP1399 VCC  
management system under all operating conditions/modes.  
The HV startup current source features an independent  
source once the VCC pin voltage level reaches V  
CC_ON  
threshold – refer to Figure 37. The application then starts  
operation and the auxiliary winding maintains the voltage  
bias for the controller during normal and skip−mode  
operating modes. The IC operates in so called Dynamic Self  
Supply (DSS) mode when the bias from auxiliary winding  
over–temperature protection system to limit I  
current  
start2  
when the die temperature reaches 130°C. At this  
temperature, I will be progressively to prevent the die  
start2  
temperature from rising above 130°C.  
is not sufficient to keep the V voltage above V  
CC  
CC_OFF  
Brown−out Protection − VBULK/PFC FB Input  
threshold (i.e. V voltage is cycling between V  
and  
CC  
CC_ON  
Resonant tank of an LLC converter is always designed to  
operate within a specific bulk voltage range. Operation  
below minimum bulk voltage level would result in current  
and temperature overstress of the converter power stage.  
The NCP1399 controller features a VBULK/PFC FB input  
in order to precisely adjust the bulk voltage turn−ON and  
turn−OFF levels. This Brown−Out protection (BO) greatly  
simplifies application level design.  
V
thresholds with no driver pulses on the output  
CC_OFF  
during positive V ramp). The HV source is also operated  
in DSS mode when the low voltage controller enters  
off−mode or fault−mode operation. In this case the VCC pin  
CC  
voltage will cycle between V  
and V  
CC_ON  
CC_OFF  
thresholds and the controller will not deliver any driver  
pulse – waiting for return from the off−mode or latch mode  
operation. Please refer to figures Figure 61 through  
www.onsemi.com  
16  
 
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