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TC2574-12.0VPA 参数 Datasheet PDF下载

TC2574-12.0VPA图片预览
型号: TC2574-12.0VPA
PDF下载: 下载PDF文件 查看货源
内容描述: 0.5A降压型开关稳压器 [0.5A Step-Down Switching Regulator]
分类和应用: 稳压器开关光电二极管
文件页数/大小: 25 页 / 216 K
品牌: TELCOM [ TELCOM SEMICONDUCTOR, INC ]
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0.5A Step-Down Switching Regulator  
TC2574  
Procedure (Adjustable Output Version: TC2574-ADJ) (Continued)  
Procedure  
Example  
5. Output Capacitor Selection (COUT  
)
5. Output Capacitor Selection (COUT  
)
A.  
40  
A. Since the TC2574 is a forwardmode switching regulator  
with voltage mode control, its open loop 2pole1zero  
frequency characteristic has the dominant polepair  
determined by the output capacitor and inductor values.  
C
OUT 13,300 x  
22.2µF  
24 x 1000  
To achieve an acceptable ripple voltage, select COUT  
100µF electrolytic capacitor.  
For stable operation, the capacitor must satisfy the  
following requirement:  
VIN(max)  
C
OUT 13,000  
[µF]  
VOUT x L[µF]  
B. Capacitor values between 10µF and 2000µF will satisfy  
the loop requirements for stable operation. To achieve an  
acceptable output ripple voltage and transient  
response, the output capacitor may need to be several  
times larger than the above formula yields.  
C. Due to the fact that the higher voltage electrolytic capaci-  
tors generally have lower ESR (Equivalent Series  
Resistance) numbers, the output capacitors voltage  
rating should be at least 1.5 times greater than the output  
voltage. For a 5.0V regulator, a rating of at least 8.0V is  
appropriate, and a 10V or 16V rating is recommended.  
Table 1. Diode Selection Guide gives an overview about through-hole diodes for an effective design.  
1.0 Amp Diodes  
VR  
Schottky  
Fast Recovery  
20V  
1N5817  
MBR120P  
1N5818  
MBR130P  
1N5819  
30V  
40V  
MUR110  
(rated to 100V)  
MBR140P  
MBR150  
MBR160  
50V  
60V  
TC2574-1 1/6/00  
10