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DER-55 参数 Datasheet PDF下载

DER-55图片预览
型号: DER-55
PDF下载: 下载PDF文件 查看货源
内容描述: 使用TNY267P 10.5 W¯¯多输出隔离电源 [10.5 W Multi Output Isolated Power Supply using TNY267P]
分类和应用:
文件页数/大小: 26 页 / 716 K
品牌: POWERINT [ Power Integrations ]
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DER-55  
TNY267 Multi Output Power Supply  
April 20, 2005  
4 Circuit Description  
4.1 Input EMI Filtering  
C10, and C13 are the bulk capacitors. Together with L4, they form the EMI filter.  
TinySwitch-II’s built-in frequency jitter helps achieve low EMI in spite of this very simple  
EMI filter.  
4.2 Primary Clamp Snubber  
D3, R1, R2, and C1 form the primary clamp snubber to clamp the voltage spike at the  
Drain pin after turn-off. D3 is a 1N4007G, a glass-passivated version of the standard  
1N4007, with controlled reverse recovery. Its use, along with R2, improves EMI and  
efficiency. If a controlled recovery diode is not available, a fast diode must be used  
instead.  
4.3 Output filtering  
C3, C5, and C7 are the main output capacitors. C4, C6, and C8, along with L1, L2, and  
L3, form second-stage output filters.  
4.4 Output Feedback  
Sensing resistors R4 and R5 detect any variation in the amplitude of the 3.3V and 5V  
outputs. These changes, due to changes in the output load or input voltage, are sampled  
to the input pin of the TL431 shunt regulator. The shunt regulator compares these  
variations with its internal voltage reference and drives a feedback current trough U1B  
proportional to the to the variations detected by R4 and R5. Opto-coupler U1 closes the  
control loop of the supply by transferring the feedback current to the output of the EN/UV  
pin on the primary side of the circuit.  
Power Integrations  
Tel: +1 408 414 9200 Fax: +1 408 414 9201  
Page 6 of 26  
www.powerint.com