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21DQ04 PDF预览

21DQ04

更新时间: 2024-02-07 06:02:09
品牌 Logo 应用领域
芯源 - MPS 转换器
页数 文件大小 规格书
11页 251K
描述
2A, 32V, 330KHz Step-Down Converter

21DQ04 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Obsolete零件包装代码:DO-41
包装说明:O-PALF-W2针数:2
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8541.10.00.80风险等级:5.53
其他特性:FREE WHEELING DIODE, HIGH RELIABILITY应用:GENERAL PURPOSE
外壳连接:ISOLATED配置:SINGLE
二极管元件材料:SILICON二极管类型:RECTIFIER DIODE
JEDEC-95代码:DO-204ALJESD-30 代码:O-PALF-W2
最大非重复峰值正向电流:420 A元件数量:1
相数:1端子数量:2
最高工作温度:150 °C最低工作温度:-40 °C
最大输出电流:2 A封装主体材料:PLASTIC/EPOXY
封装形状:ROUND封装形式:LONG FORM
峰值回流温度(摄氏度):NOT SPECIFIED认证状态:Not Qualified
最大重复峰值反向电压:40 V表面贴装:NO
技术:SCHOTTKY端子形式:WIRE
端子位置:AXIAL处于峰值回流温度下的最长时间:NOT SPECIFIED
Base Number Matches:1

21DQ04 数据手册

 浏览型号21DQ04的Datasheet PDF文件第5页浏览型号21DQ04的Datasheet PDF文件第6页浏览型号21DQ04的Datasheet PDF文件第7页浏览型号21DQ04的Datasheet PDF文件第9页浏览型号21DQ04的Datasheet PDF文件第10页浏览型号21DQ04的Datasheet PDF文件第11页 
MP1591 – 2A, 32V, 330KHz STEP-DOWN CONVERTER  
To optimize the compensation components that  
are not listed in Table 4, use the following  
procedure.  
Example:  
VOUT = 5V, C5 = 22µF Ceramic (ESR = 10m)  
R3 6.88x107 (22x10-6) (5) = 7568ꢀ  
Use the nearest standard value of 7.5k.  
C4 > 1.93x10-5 / 7.5K = 2.57nF  
Use standard value of 2.7nF.  
Choose the compensation resistor to set the  
desired crossover frequency. Determine the  
value by the following equation:  
2π × C5 × VOUT × fC  
R3 =  
GEA × GCS × VREF  
8π x C5 x RESR x fC = 0.22, which is less than 1.  
Therefore, no second compensation capacitor  
(C3) is required.  
Putting in the know constants and setting the  
crossover frequency to the desired 33KHz:  
R3 6.88 ×107 × C5 × VOUT  
External Bootstrap Diode  
It is recommended that an external bootstrap  
diode be added when the system has a 5V  
fixed input or the power supply generates a 5V  
output. This helps improve the efficiency of the  
regulator. The bootstrap diode can be a low  
cost one such as IN4148 or BAT54.  
Choose the compensation capacitor to set the  
zero below one fourth of the crossover  
frequency. Determine the value by the following  
equation:  
2
1.93 ×105  
C4 >  
5V  
π × R3 × fC  
R3  
Determine if the second compensation  
capacitor, C3, is required. It is required if the  
ESR zero of the output capacitor occurs at less  
than four times the crossover frequency, or  
1
BS  
10nF  
MP1591  
3
SW  
8π × C5 × RESR × fC 1  
Figure 2—External Bootstrap Diode  
If this is the case, then add the second  
compensation resistor. Determine the value by  
the equation:  
This diode is also recommended for high duty  
VOUT  
cycle operation (when  
>65%) and high  
VIN  
C5 × RESR(MAX)  
C3 =  
output voltage (VOUT>12V) applications.  
R3  
Where RESR(MAX) is the maximum ESR of the  
output capacitor.  
MP1591 Rev. 2.3  
9/27/2006  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2006 MPS. All Rights Reserved.  
8

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