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DPA425GN

更新时间： 2024-01-25 18:03:36
品牌 Logo 应用领域
帕沃英蒂格盛 - POWERINT /
页数 文件大小 规格书
20页 1071K
描述
DC-DC Forward Converter Design Guide Application Note AN-31

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DPA425GN 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Active零件包装代码：SFM
包装说明：,针数：6
Reach Compliance Code：compliant风险等级：5.32
模拟集成电路 - 其他类型：SWITCHING REGULATOR控制模式：VOLTAGE-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：75 V
最小输入电压：16 V标称输入电压：40 V
JESD-30 代码：R-PSSO-G6JESD-609代码：e0
长度：9.4 mm功能数量：1
端子数量：6最高工作温度：125 °C
最低工作温度：-40 °C最大输出电流：1.75 A
封装主体材料：PLASTIC/EPOXY封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：NOT SPECIFIED
认证状态：Not Qualified座面最大高度：2.054 mm
表面贴装：YES切换器配置：SINGLE
最大切换频率：425 kHz技术：CMOS
温度等级：AUTOMOTIVE端子面层：Tin/Lead (Sn/Pb)
端子形式：GULL WING端子节距：1.27 mm
端子位置：SINGLE处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：8 mm

DPA425GN 数据手册

 浏览型号DPA425GN的Datasheet PDF文件第14页浏览型号DPA425GN的Datasheet PDF文件第15页浏览型号DPA425GN的Datasheet PDF文件第16页浏览型号DPA425GN的Datasheet PDF文件第18页浏览型号DPA425GN的Datasheet PDF文件第19页浏览型号DPA425GN的Datasheet PDF文件第20页 
AN-31  
Solder Side  
Component Side  
TOP VIEW  
Output  
Diode  
V
Transformer  
+
D
S
Inductor  
(Coupled)  
V
DPA-Switch  
X
L
C
V
+
DC  
Out  
-
Opto-  
coupler  
-
V
Maximize hatched copper area for optimum heat sinking  
Via between board layers  
V
PI-2883-060602  
Figure 13. Layout Considerations for DPA-Switch Using R Package.  
board material is used (such as FR4), providing copper areas on  
both sides of the board and using thicker copper will improve  
heat sinking.  
1. Maximum drain voltage – Verify that peak drain-to-source  
voltage does not exceed minimum BVDSS at highest input  
voltage and maximum overload output power. It is normal,  
however, to have additional margin of approximately 25 V  
below BVDSS to allow for other power supply component  
unit-to-unit variations. Maximum overload output power  
occurs when the output is loaded to a level just before the  
power supply goes into auto-restart (loss of regulation).  
If an aluminum clad board is used, then shielding of switching  
nodesisrecommended.Thisconsistsofanareaofcopperplaced  
directly underneath switching nodes such as the drain node  
and output diode to provide an electrostatic shield to prevent  
coupling to the aluminum substrate. These areas are connected  
to input negative in the case of the primary and output return  
for secondary. This reduces the amount of capacitive coupling  
into the insulated aluminum substrate that can then appear on  
the output as ripple and high frequency noise.  
2. Transformer reset margin – Drain voltage should also be  
checked at highest input voltage with a severe load step  
(50% to 100%) to verify adequate transformer reset margin.  
This test slews the duty cycle at high input voltage, placing  
the most demand on the transformer reset circuit.  
Quick Design Checklist  
3. Maximumdraincurrent–Atmaximumambienttemperature,  
maximum input voltage and maximum output load, verify  
drain current waveforms at start-up for any signs of  
transformer or output inductor saturation and excessive  
leading edge current spikes. DPA-Switch has a leading edge  
blanking time of 100 ns to prevent premature termination  
of the cycle. Verify that the leading edge current spike does  
not extend beyond the blanking period.  
As with any power supply design, all DPA-Switch designs  
should be verified on the bench to make sure that component  
specifications limits are not exceeded under worst case  
conditions.ThefollowingminimumsetoftestsforDPA-Switch  
forward converters is strongly recommended:  
C
7/04  
17  
1...14151617181920

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