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LNK6775K 参数 Datasheet PDF下载

LNK6775K图片预览
型号: LNK6775K
PDF下载: 下载PDF文件 查看货源
内容描述: [IC OFFLINE SW PSR 12ESOP]
分类和应用: 光电二极管
文件页数/大小: 24 页 / 2266 K
品牌: POWERINT [ Power Integrations ]
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LinkSwitch-HP  
Layout Considerations for eDIP-12B package  
1. Maximum drain voltage – Verify that VDS does not exceed  
675 V for LNK677X series and 600 V for LNK6X6X series.  
This gives a 50 V margin for design variations.  
2. Under all conditions, the maximum Drain current should be  
below the specified absolute maximum ratings.  
3. Thermal check – At rated maximum output power, minimum  
input voltage and maximum ambient temperature, verify that  
the maximum allowed temperature is not exceeded for any  
component in the design. Of particular importance is  
checking the temperature rise of the major power conversion  
components such as transformer, output diodes, input  
bridge, primary clamp circuit and LinkSwitch-HP. Under the  
stated conditions above, LinkSwitch-HP tab temperature  
should not exceed 110 °C.  
The schematic extract in Figure 13 is an example of LinkSwitch-HP  
used in a dual output LCD monitor supply using eDIP-12B  
package. In this design the exposed metal tab on the topside  
of package is left open (no heat sink). The SOURCE pins of  
LinkSwitch-HP provide heat sinking through connection to the  
source copper pad of PCB. This technique is adequate for  
device dissipation up to 0.85 W (1/2 square inch of copper area  
required). The layout guidelines described for eSIP-7C are the  
same for eDIP-12B with an added consideration about sensitive  
component layout. The return referenced components C4, C8,  
C16, R9, R7 must be placed directly under the LinkSwitch-HP  
package as shown in Figure 14. This requires that these  
particular components be SMD type as this allows an ideal  
noise-immune layout.  
Output Power Table Assumptions  
D
S
BP  
12 V output.  
Schottky rectification.  
82% efficiency.  
VOR = 135 V.  
KP = 0.4 for 85-265 VAC input and KP = 0.6 for 195-265 VAC  
input.  
VMIN = 100 V for 85-265 VAC input and VMIN = 250 V for  
195-265 VAC input.  
LinkSwitch-HP  
U1  
LNK6774V  
CONTROL  
FB  
C5  
4.7 µF  
10 V  
PD CP  
C16  
10 pF  
50 V  
R9  
R7  
10.5 kΩ  
1%  
100 kΩ  
1%  
R6  
1/16 W  
1/16 W  
23.2 kΩ  
1%  
1/16 W  
C8  
100 pF  
50 V  
C4*  
C7  
100 nF  
25 V  
0.85 W device dissipation for open frame designs with PCB  
heat sink.  
PI-6860-120312  
*Optional  
Figure 13. 17 W LCD Monitor Supply (+18 V, +5 V).  
Quick Design Checklist  
All LinkSwitch-HP designs should be verified on the bench  
particularly for specified worst-case stress conditions. The  
following set of tests are strongly recommended:  
Figure 14. Layout for LCD Monitor Supply using eDIP-12B Package.  
11  
Rev. E 06/15  
www.power.com  
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