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21DQ04

更新时间： 2024-01-26 13:42:05
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

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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3页浏览型号21DQ04的Datasheet PDF文件第4页浏览型号21DQ04的Datasheet PDF文件第5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8页浏览型号21DQ04的Datasheet PDF文件第9页 
MP1591 – 2A, 32V, 330KHz STEP-DOWN CONVERTER  
The input capacitor value should be greater  
than 10µF. The capacitor can be electrolytic,  
tantalum or ceramic. However, since it absorbs  
the input switching current it requires an  
adequate ripple current rating. Its RMS current  
rating should be greater than approximately 1/2  
of the DC load current.  
Output Rectifier Diode (D1)  
The output rectifier diode supplies the current to  
the inductor when the high-side switch is off. To  
reduce losses due to the diode forward voltage  
and recovery times, use a Schottky rectifier.  
Table 2 provides some recommended Schottky  
rectifiers based on the maximum input voltage  
and current rating.  
For insuring stable operation C1 should be  
placed as close to the IC as possible.  
Alternately, a smaller high quality ceramic  
0.1µF capacitor may be placed closer to the IC  
and a larger capacitor placed farther away. If  
using this technique, it is recommended that the  
larger capacitor be a tantalum or electrolytic  
type. All ceramic capacitors should be placed  
close to the MP1591.  
Table 2—Diode Selection Guide  
2A Load Current  
3A Load Current  
VIN  
(Max)  
Part  
Part  
Vendor  
Vendor  
Number  
Number  
30BQ15  
B220  
15V  
20V  
4
1
B320  
SK33  
1
1, 6  
3
SK23  
6
SR22  
6
SS32  
20BQ030  
B230  
4
B330  
1
Output Capacitor (C5)  
1
B340L  
MBRD330  
SK33  
1
The output capacitor is required to maintain the  
DC output voltage. Low ESR capacitors are  
preferred to keep the output voltage ripple low.  
The characteristics of the output capacitor also  
affect the stability of the regulation control  
system. Ceramic, tantalum or low ESR  
electrolytic capacitors are recommended. In the  
case of ceramic capacitors, the impedance at  
the switching frequency is dominated by the  
capacitance, and so the output voltage ripple is  
mostly independent of the ESR. The output  
voltage ripple is estimated to be:  
30V  
34V  
SK23  
6
4, 5  
1, 6  
2, 3  
1
SR23  
3, 6  
2, 3  
4
SS23  
SS33  
21DQ04  
MBRS240L  
SK24  
B340L  
MBRS340  
SK34  
5
4
6
1, 6  
2, 3  
SS24  
2, 3  
SS34  
Table 3 lists manufacturer’s websites.  
Table 3—Schottky Diode Manufacturers  
#
1
2
3
4
5
6
Vendor  
Web Site  
Diodes, Inc.  
www.diodes.com  
2
⎛
⎜
⎜
⎝
⎞
⎟
⎟
⎠
fLC  
VRIPPLE ≅ 1.4 × VIN  
×
Fairchild Semiconductor www.fairchildsemi.com  
General Semiconductor www.gensemi.com  
fSW  
Where VRIPPLE is the output ripple voltage, fLC is  
the resonant frequency of the LC filter, fSW is the  
switching frequency.  
International Rectifier  
On Semiconductor  
Pan Jit International  
www.irf.com  
www.onsemi.com  
www.panjit.com.tw  
In the case of tantalum or low-ESR electrolytic  
capacitors, the ESR dominates the impedance  
at the switching frequency, and so the output  
ripple is calculated as:  
Choose a rectifier whose maximum reverse  
voltage rating is greater than the maximum  
input voltage, and whose current rating is  
greater than the maximum load current.  
VRIPPLE ≅ ∆I× RESR  
Where VRIPPLE is the output voltage ripple and  
RESR is the equivalent series resistance of the  
output capacitors.  
MP1591 Rev. 2.3  
9/27/2006  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2006 MPS. All Rights Reserved.  
6
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