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LT1576CS8-5 参数 Datasheet PDF下载

LT1576CS8-5图片预览
型号: LT1576CS8-5
PDF下载: 下载PDF文件 查看货源
内容描述: 1.5A , 200kHz的降压型开关稳压器 [1.5A, 200kHz Step-Down Switching Regulator]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
文件页数/大小: 28 页 / 293 K
品牌: Linear [ Linear ]
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LT1576/LT1576-5  
U
W U U  
APPLICATIONS INFORMATION  
SWITCH NODE CONSIDERATIONS  
under the switcher circuitry to prevent interplane cou-  
pling. A suggested layout for the critical components is  
shown in Figure 5. Note that the feedback resistors and  
compensation components are kept as far as possible  
from the switch node. Also note that the high current  
groundpathofthecatchdiodeandinputcapacitorarekept  
very short and separate from the analog ground line.  
For maximum efficiency, switch rise and fall times are  
made as short as possible. To prevent radiation and high  
frequency resonance problems, proper layout of the com-  
ponents connected to the switch node is essential. B field  
(magnetic) radiation is minimized by keeping catch diode,  
switch pin, and input bypass capacitor leads as short as  
possible. E field radiation is kept low by minimizing the  
length and area of all traces connected to the switch pin  
and BOOST pin. A ground plane should always be used  
Thehighspeedswitchingcurrentpathisshownschemati-  
cally in Figure 6. Minimum lead length in this path is  
essential to ensure clean switching and low EMI. The path  
TAKE OUTPUT DIRECTLY FROM END  
CONNECT OUTPUT  
CAPACITOR DIRECTLY  
TO HEAVY GROUND  
OF OUTPUT CAPACITOR TO AVOID  
PARASITIC RESISTANCE AND  
INDUCTANCE (KELVIN CONNECTION)  
C1  
V
OUT  
MINIMUM SIZE  
OF FEEDBACK PIN  
CONNECTIONS  
MINIMIZE AREA  
OF CONNECTIONS  
TO SWITCH NODE  
AND BOOST NODE  
L1  
D2  
TO AVOID PICKUP  
SHDN/SYNC  
C2  
SW  
IN  
KEEP INPUT  
CAPACITOR  
AND CATCH  
R2  
D1  
C3  
TERMINATE  
V
FB  
DIODE CLOSE  
TO REGULATOR  
AND TERMINATE  
THEM TO THE  
SAME POINT  
FEEDBACK  
RESISTORS AND  
COMPENSATION  
COMPONENTS  
DIRECTLY TO  
SWITCHER  
C
BOOST  
V
C
C
R1  
GND  
R
GROUND PIN  
C
GND  
GROUND RING NEED NOT BE AS SHOWN  
(NORMALLY EXISTS AS INTERNAL PLANE)  
1576 F05  
Figure 5. Suggested Layout for LT1576  
SWITCH NODE  
L1  
5V  
HIGH  
FREQUENCY  
CIRCULATING  
PATH  
V
IN  
LOAD  
1576 F06  
Figure 6. High Speed Switching Path  
16  
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