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DI-25 参数 Datasheet PDF下载

DI-25图片预览
型号: DI-25
PDF下载: 下载PDF文件 查看货源
内容描述: 30W的DC -DC转换器采用同步整流 [30 W DC-DC Converter with Synchronous Rectification]
分类和应用: 转换器
文件页数/大小: 2 页 / 484 K
品牌: POWERINT [ Power Integrations ]
 浏览型号DI-25的Datasheet PDF文件第1页  
DI-25  
• At zero load, maximum input voltage, the bias voltage  
across C4 should be 8 V (12 V to 15 V under nominal  
conditions).  
• Good layout practices should be followed:  
- LocateC5,C6andR4closetoU1withgroundsreturned  
to the SOURCE pin.  
OUTPUT INDUCTOR PARAMETERS  
RM6ILP  
Ferroxcube 3F3 material  
Gap for ALG of 278 nH/T2  
Core  
Main: 6T, 4x26 AWG  
Bias: 15T, 32 AWG  
Winding Details  
Bobbin  
- Primary return should be connected to the DPA-Switch  
tab, not the SOURCE pin.  
RM6ILP 8 pin  
(EPCOS B-65821-A6008-T1 or equivalent)  
- Minimize the primary and secondary loop areas to  
reduce parasitic leakage inductance.  
Winding Order  
(pin numbers)  
Bias (1-2), tape,  
Main Winding (7,8-5,6), tape  
• Consult AN-31 for additional design tips and information.  
• Choose C17 to provide adequate gate charge to Q2 at low  
line (typically 5 V) and to limit Q2 gate to a safe voltage at  
high line (typically less than 20 V).  
Inductance  
8 µH ±10%  
Table 2. Output Inductor Construction Information.  
100  
90  
TRANSFORMER PARAMETERS  
EFD20 Ungapped  
Ferroxcube EFD20-3F3  
Core  
EFD20 10 pin  
Bobbin  
80  
(B&B B-052 or equivalent)  
V
V
V
= 36 VDC  
= 48 VDC  
= 72 VDC  
IN  
IN  
IN  
Primary: 8T + 8T, 25 AWG  
Secondary: 4T, 0.002" Cu Foil  
Winding Detail  
70  
Primary (5-3), tape,  
Winding Order  
Secondary (6,7-9,10), tape,  
(pin numbers)  
Primary (3-1), tape  
60  
50  
Inductance  
Primary: 307 µH ±25%, Leakage: 1 µH (max.)  
Primary Resonant  
Frequency  
3 MHz (minimum)  
0
5
10  
15  
20  
25  
30  
Table 1. Transformer Construction Information.  
Output Power (W)  
Figure 2. DPA-Switch 30 W, 5 V Synchronous  
Rectifier Efficiency vs. Output Power.  
For the latest updates, visit www.powerint.com  
PowerIntegrationsmaymakechangestoitsproductsatanytime. PowerIntegrationshasnoliabilityarisingfromyouruseofanyinformation, deviceorcircuitdescribed  
herein nor does it convey any license under its patent rights or the rights of others. POWER INTEGRATIONS MAKES NO WARRANTIES HEREIN AND SPECIFICALLY  
DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,  
AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS. The products and applications illustrated herein (including circuits external to the products and transformer  
construction) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations.  
A complete list of Power Integrations' patents may be found at www.powerint.com.  
The PI logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch and EcoSmartare registered trademarks of Power Integrations. PI Expertand  
PI FACTS are trademarks of Power Integrations. Copyright 2004, Power Integrations  
Power Integrations  
5245 Hellyer Avenue  
San Jose, California 95138  
MAIN PHONE NUMBER  
+1 408-414-9200  
APPLICATIONS HOTLINE  
+1 408-414-9660  
APPLICATIONS FAX  
+1 408-414-9760  
For a complete listing of worldwide sales offices,  
please visit www.powerint.com  
D
12/04  
www.powerint.com