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AN-32 参数 Datasheet PDF下载

AN-32图片预览
型号: AN-32
PDF下载: 下载PDF文件 查看货源
内容描述: TOPSwitch-GX的反激式设计方法\n [TOPSwitch-GX Flyback Design Methodology ]
分类和应用:
文件页数/大小: 16 页 / 134 K
品牌: ETC [ ETC ]
 浏览型号AN-32的Datasheet PDF文件第7页浏览型号AN-32的Datasheet PDF文件第8页浏览型号AN-32的Datasheet PDF文件第9页浏览型号AN-32的Datasheet PDF文件第10页浏览型号AN-32的Datasheet PDF文件第12页浏览型号AN-32的Datasheet PDF文件第13页浏览型号AN-32的Datasheet PDF文件第14页浏览型号AN-32的Datasheet PDF文件第15页  
AN-32  
• Z is loss allocation factor and η is efficiency from Step 1.  
Step 14. Set value for number of primary layers L and  
number of secondary turns NS (may need iteration)  
Step 13. Choose core and bobbin based on fS and PO using  
Table 6 and determine Ae, Le, AL and BW from core and  
bobbin catalog  
• Starting with L = 2 (Keep 1.0 L 2.0 throughout  
iteration).  
• Starting with NS = 0.6 turn/volt.  
• Both L and NS may need iteration.  
• Core effective cross-sectional area, Ae: in cm2.  
• Core effective path length, Le: in cm.  
• Core ungapped effective inductance, AL: in nH/turn2.  
• Bobbin width, BW: in mm.  
Step 15. Calculatenumberof primaryturnsNP andnumber  
of bias turns NB  
• Choose core and bobbin based on fS, PO and construction  
type.  
• Diode forward voltages: 0.7 V for ultra-fast P/N diode and  
0.5 V for Schottky diode.  
• Set output rectifier forward voltage, VD.  
• Set bias rectifier forward voltage, VDB.  
• Calculate number of primary turns.  
66 kHz  
Triple  
Insulated  
Wire  
132 kHz  
Triple  
Insulated  
Wire  
Output  
Power  
Margin  
Wound  
Margin  
Wound  
VOR  
NP = NS ×  
EF12.6  
EE13  
EF16  
EE16  
EE19  
EI22  
EI22  
EE19  
EI22/19/6 EF16  
EEL16  
EF20  
EI25  
EF12.6  
EE13  
EI22  
EE19  
E122/19/6  
EEL16  
VO + VD  
• Calculate number of bias turns NB.  
EE16  
0-10 W  
VB + VDB  
NB = NS ×  
EI22/19/6 EEL19  
VO + VD  
EF20  
EI28  
EEL22  
EE19  
EI22  
EF20  
EI25  
10 W-  
20 W  
Step 16. DetermineprimarywindingwireparametersOD,  
DIA, AWG  
EF25 EI22/19/6 EEL19  
EF20  
EF25  
EI30  
EPC30  
EEL25  
E30/15/7  
EER28  
E128  
• Primary wire outside diameter in mm.  
20 W-  
30 W  
L × (BW 2 × M)  
EI28  
EI30  
EF25  
EEL22  
EF25  
EI30  
OD =  
NP  
E30/15/7 ETD29  
EER28  
30 W-  
50 W  
where L is number of primary layers,  
BW is bobbin width in mm,  
M is safety margin in mm.  
EI35  
EI33/29/  
13-Z  
EER28L  
EF32  
EPC30  
ETD29  
EI35  
EF32  
EI28  
EI30  
EEL25  
E30/15/7  
EER28  
ETD29  
EI35  
EI33/29/  
13-Z  
EER28L  
EF32  
ETD34  
EI40  
• Determine primary wire bare conductor diameter DIA and  
primary wire gauge AWG.  
50 W-  
70 W  
ETD34  
ETD34  
EI40  
Step 17 to Step 22. Check BM, CMA and Lg. Iterate if  
necessary by changing L, NS or core/bobbin until within  
specified range  
E36/18/11 E36/18/11 E30/15/7  
EI40  
EER35  
EER28  
ETD29  
70 W-  
100 W  
• Set safety margin, M. Use 3 mm (118 mils) for margin  
wound and zero for triple insulated secondary.  
• Maximum flux density: 3000 BM 2000, in gauss or  
0.3 BM 0.2, in tesla.  
ETD39  
EER40  
ETD39  
EER40  
EI35  
EF32  
100 W-  
150 W  
E42/21/15 ETD34 E36/18/11  
EER35  
E42/21/15 E42/21/20 E36/18/11 ETD39  
E42/21/20 E55/28/21 EI40 EER40  
100 × IP ×LP  
BM =  
E55/28/21  
ETD39 E42/21/15  
EER40 E42/21/20  
E42/21/15 E55/28/21  
E42/21/20  
NP ×Ae  
>150W  
where units are gauss, amps, µH and cm2  
E55/28/21  
Table 6. Transformer Core.  
B
12/02  
11  
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