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DI-29 参数 Datasheet PDF下载

DI-29图片预览
型号: DI-29
PDF下载: 下载PDF文件 查看货源
内容描述: 25W的反激式DC -DC转换器 [25 W Flyback DC-DC Converter]
分类和应用: 转换器
文件页数/大小: 2 页 / 66 K
品牌: POWERINT [ Power Integrations ]
 浏览型号DI-29的Datasheet PDF文件第1页  
DI-29  
Key Design Points  
Transformer Parameters  
• For nominal under-voltage set point VUV:  
R1 = (VUV-2.35 V)/50µA. VOV = (R1×135 µA)+2.5 V.  
• Zener VR1 voltage is 130 V to safely limit the DRAIN  
voltage below VDSS of 200 V.  
PR1408  
Core Material  
Bobbin  
Siemens N87  
Gap for 340 nH/T2  
P1408 8 pin (B&B B-096 or equivalent)  
• Opto U2 should have a CTR of between 100% and 200%  
for optimum loop stability.  
• Set resonance of L2 and C13 + C14 to beyond loop  
crossover frequency (typically 5% to 10% of switching  
frequency).  
• Good layout practices should be followed:  
- Locate C5, C6 and R4 close to U1, with grounds  
returned to the SOURCE pin.  
Primary: 6T + 6T, 2 x 27 AWG  
Secondary: 3T, 4 x 25 AWG  
Bias: 6T, 32 AWG  
Winding Details  
Primary (4-FL), tape, Bias (2-3), tape,  
Secondary (5,6-7,8), tape,  
Primary (FL-1), tape  
Winding Order  
(pin numbers)  
Primary: 49 µH ±10%, Leakage: 1 µH (max)  
Inductance  
Primary Resonant  
Frequency  
3.8 MHz (minimum)  
- Primary return should be connected to the DPA-Switch  
tab, not the SOURCE pin.  
- Minimize the primary and secondary loop areas to  
reduce parasitic leakage inductance.  
Table 1. Transformer Construction Information.  
100  
80  
60  
40  
20  
36 VDC  
48 VDC  
60 VDC  
72 VDC  
0
0
5
10  
Output Current (W)  
Figure 2. Efficiency vs. Output Power.  
15  
20  
25  
For the latest updates, visit our Web site: www.powerint.com  
Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability.  
Power Integrations does not assume any liability arising from the use of any device or circuit described herein, nor does it convey any  
license under its patent rights or the rights of others. 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 and EcoSmart are registered trademarks of Power Integrations, Inc.  
PI Expert is a trademark of Power Integrations Inc. ©Copyright 2002, Power Integrations, Inc.  
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B
12/02  
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