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UCC28951PWR 参数 Datasheet PDF下载

UCC28951PWR图片预览
型号: UCC28951PWR
PDF下载: 下载PDF文件 查看货源
内容描述: [具有 SR 控制功能的绿色环保相移全桥控制器,适用于宽输入电压范围 | PW | 24 | -40 to 125]
分类和应用: 控制器
文件页数/大小: 82 页 / 3502 K
品牌: TI [ TEXAS INSTRUMENTS ]
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UCC28951  
www.ti.com.cn  
ZHCSIQ7A AUGUST 2018 REVISED DECEMBER 2021  
P
= P  
-PCOUT » 25.2W  
BUDGET  
BUDGET  
(74)  
8.2.2.8 Select FETs QE and QF  
Selecting FETs for a design is an iterative process. To meet the power requirements of this design, we select 75-  
V, 120-A FETs, from Fairchild, part number FDP032N08. These FETs have the following characteristics.  
QEg = 152nC  
(75)  
Rds(on)QE = 3.2mW  
(76)  
Calculate average FET COSS (COSS_QE_AVG) based on the data sheet parameters for COSS (COSS_SPEC), and  
drain to source voltage where COSS_SPEC was measured (Vds_spec), and the maximum drain to source voltage in  
the design (VdsQE) that will be applied to the FET in the application.  
The voltage across FET QE and QF when they are of isf:  
2V  
INMAX  
VdsQE  
=
= 39 V  
a1  
(77)  
(78)  
(79)  
The voltage where FET COSS is specified and tested in the FET data sheet:  
Vds _ spec = 25V  
The specified output capacitance from FET data sheet is:  
COSS _ SPEC = 1810pF  
The average QE and QF COSS [2] is calculated using 方程80:  
Vds_SPEC  
COSS_QE_ AVG = COSS_SPEC  
» 1.9nF  
VdsQE  
(80)  
(81)  
The QE and QF RMS current are:  
IQE _RMS = ISRMS = 36.0A  
To estimate FET switching loss the Vg vs. Qg curve from the FET data sheet needs to be studied. First the gate  
charge at the beginning of the miller plateau needs to be determined (QEMILLER_MIN) and the gate charge at the  
end of the miller plateau (QEMILLER_MAX) for the given VDS  
.
The maximum gate charge at the end of the miller plateau is:  
QEMILLER _MAX » 100nC  
(82)  
(83)  
The minimum gate charge at the beginning of the miller plateau is:  
QEMILLER _MIN » 52nC  
Copyright © 2023 Texas Instruments Incorporated  
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53  
Product Folder Links: UCC28951  
English Data Sheet: SLUSDB2  
 
 
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