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DPA425GN

更新时间： 2024-01-10 14:00:06
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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中文翻译

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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12页浏览型号DPA425GN的Datasheet PDF文件第13页浏览型号DPA425GN的Datasheet PDF文件第14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17页浏览型号DPA425GN的Datasheet PDF文件第18页 
AN-31  
Efficiency Gain Over Diode  
Rectification  
Output Voltage  
L2  
5 V  
+3%  
+6%  
+8%  
R15  
3.3 V  
2.5 V  
Q1  
D3  
Q2  
PI-2989-062204  
L2  
Table 3. Efficiency Gain vs. Output Voltage for Synchronous  
Rectification.  
(a)  
C17  
R16  
The forward rectifier MOSFET Q2 turns on when the  
DPA-Switch turns on to apply the DC input voltage across the  
primary winding. The direction of current in Q2 is from source  
to drain. When the DPA-Switch turns off, the reset voltage on  
the transformer forces a negative gate-to-source voltage on Q2  
andapositivegate-to-sourcevoltageonQ1. SchottkydiodeD3  
conductsuntilthegate-to-sourcevoltageonQ1risessufficiently  
to exceed the threshold voltage.  
R15  
Q1  
D3  
D4  
Q2  
PI-3475-062204  
(b)  
Figure 12. Synchronous Rectification (a) Winding Driven DC  
Coupled. (b) Winding Driven AC Coupled.  
Suitable MOSFETs for this applicationhave threshold voltages  
typicallybetween4Vand5V. Thepermissiblemaximumgate-  
to-source voltage is usually 15 V to 20 V. These restrictions  
limit the range of input voltage for converter operation.  
output. For a 5 V output, an efficiency of 85% with Schottky  
rectifierswouldtypicallygoto90%orhigherwithsynchronous  
rectifiers. Synchronousrectificationgivesthebenefitofgreater  
efficiency at lower output voltages as shown in Table 3.  
TheintegratedlineovervoltagefeatureofDPA-Switchsimplifies  
the design of winding driven synchronous rectifiers. In most  
cases it eliminates the need for Zener diodes to protect the gates  
of the MOSFETs from excessive voltage. Excess voltage will  
not appear on the secondary of the transformer because the  
DPA-Switch will not operate when the input voltage is too  
high.  
DPA-Switch has features that can simplify the design of  
synchronous rectifier circuits that are in common use. Circuits  
for synchronous rectification with DPA-Switch fall into three  
categories of increasing complexity.  
a) Winding Driven DC Coupled  
b) Winding Driven AC Coupled  
c) Actively Driven  
DC coupling of the gates in this configuration permits a mode  
of operation that may not be desirable in some applications.  
Duringshutdown, thevoltageacrosstheoutputinductorwillgo  
to zero after its current decays to zero. The remaining output  
voltage will then appear across Q1 and D3.  
The first two are shown in Figures 11 and 12. MOSFETs Q1  
andQ2conductatappropriatetimestoreducethevoltagedrops  
associated with the output rectifiers of a forward converter. Q2  
performsthefunctionoftheforwardrectifier. Q1operatesasthe  
catch rectifier with a parallel Schottky diode. The voltage drop  
of each synchronous rectifier is dominated by the on-resistance  
of the MOSFETs multiplied by the RMS load current, rather  
than by the average current times the minimum voltage of a  
Schottky barrier.  
If the output voltage is high enough (above the gate threshold  
of Q2) it will turn on Q2, allowing reverse current to flow  
through L2 and the transformer secondary. The voltage on the  
secondarywindingwillsaturatethetransformer,abruptlyturning  
off Q2 and generating a voltage spike on the gate of Q1. This  
voltage spike may exceed the rated gate voltage for Q1. This  
behaviorcanoccurinanydesignusingthisformofsynchronous  
rectification with an undervoltage lockout. It is not specific to  
DPA-Switch. A solution to this issue is offered below.  
Winding Driven DC Coupled Synchronous Rectifier  
The simplest way to drive synchronous rectifiers with  
DPA-Switch is shown in Figure 12 (a). The gate-to-source  
voltage that turns on the MOSFETs is essentially the voltage  
at the secondary winding of the transformer. The channel of the  
MOSFET will conduct as long as the gate-to-source voltage  
exceeds the threshold voltage.  
Winding Driven AC Coupled Synchronous Rectifier  
The AC coupled circuit of Figure 12 (b) eliminates the high  
voltagespikebylimitingtheon-timeofQ2suchthatsignificant  
reverse current cannot flow through L2 and the secondary  
C
7/04  
15  
1...12131415161718...20

中文翻译

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DPA425GN 替代型号

型号 品牌 替代类型 描述 数据表
DPA425GN POWERINT

当前型号

 DC-DC Forward Converter Design Guide Application Note AN-31
DPA425G-TL POWERINT

完全替代

 Highly Integrated DC-DC Converter ICs for Distributed Power Architectures

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DPA426GN-TL POWERINT

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DPA426G-TL POWERINT

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