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DPA423G

更新时间： 2024-02-06 06:52:59
品牌 Logo 应用领域
帕沃英蒂格盛 - POWERINT 转换器电信开关光电二极管以太网
页数 文件大小 规格书
34页 2832K
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Highly Integrated DC-DC Converter ICs for Power over Ethernet & Telecom Applications

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中文翻译

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DPA423G 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：PLASTIC, MO-169-7C, 6 PIN针数：6
Reach Compliance Code：compliant风险等级：5.19
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 mmBase Number Matches：1

DPA423G 数据手册

 浏览型号DPA423G的Datasheet PDF文件第5页浏览型号DPA423G的Datasheet PDF文件第6页浏览型号DPA423G的Datasheet PDF文件第7页浏览型号DPA423G的Datasheet PDF文件第9页浏览型号DPA423G的Datasheet PDF文件第10页浏览型号DPA423G的Datasheet PDF文件第11页 
DPA422-426  
In order to be recognized as a synchronization pulse, the  
LINE-SENSE pin needs to stay low (on-time) for at least  
120 ns but no more than 2250 ns for 400 kHz (or 3080 ns for  
300 kHz) internal switching frequency. In addition, the off-time  
must be kept below 7.7 µs, which is a limitation set by the  
lowest synchronization frequency of 128 kHz allowed by the  
chip. The effective DCMAX for synchronization operation can be  
(137 °C typical). When the junction temperature cools to below  
the hysteretic temperature (110 °C typical), normal operation  
resumes providing automatic recovery. VC is regulated in  
hysteretic mode and a 4.8 V to 5.8 V (typical) sawtooth  
waveform is present on the CONTROL pin while in thermal  
shutdown.  
Bandgap Reference  
×
calculated as 0.75 fSYNC/fOSC. An off-time longer than  
All critical DPA-Switch internal voltages are derived from a  
temperature-compensated bandgap reference. This reference  
is also used to generate a temperature-compensated current  
reference that is trimmed to accurately set the switching  
frequency, current limit, and the line OV/UV thresholds.  
DPA-Switch has improved circuitry to maintain all of the above  
critical parameters within very tight absolute and temperature  
tolerances.  
7.7 µs may force the CONTROL pin to go into the hysteretic  
mode and initiate a soft-start cycle at next turn-on.  
Soft-Start  
Two on-chip soft-start functions are activated at start-up with a  
duration of 5 ms (typical). Maximum duty cycle starts from 0%  
and linearly increases to the default maximum of 75% at the  
end of the 5 ms duration and the current limit starts from about  
85% and linearly increases to 100% at the end of the  
5 ms duration. In addition to start-up, soft-start is also activated  
at each restart attempt during auto-restart and when restarting  
after being in hysteretic regulation of CONTROL pin voltage (VC),  
due to remote off or thermal shutdown conditions. This  
effectively minimizes current and voltage stresses on the output  
MOSFET, the clamp circuit and the output rectifier during start-  
up. This feature also helps minimize output overshoot and  
prevents saturation of the transformer during start-up.  
High-Voltage Bias Current Source  
This current source biases DPA-Switch from the DRAIN pin and  
charges the CONTROL pin external capacitance during start-up  
or hysteretic operation. Hysteretic operation occurs during  
auto-restart, remote off and over-temperature shutdown. In this  
mode of operation, the current source is switched on and off  
with an effective duty cycle of approximately 20%. This duty  
cycle is determined by the ratio of CONTROL pin charge (IC(CH)  
)
and discharge currents (ICD1 and ICD2). This current source is  
Shutdown/Auto-Restart  
turned off during normal operation when the output MOSFET is  
switching. The effect of the current source switching may be  
seen on the DRAIN voltage waveform as small disturbances,  
which is normal.  
To minimize DPA-Switch power dissipation under fault  
conditions, the shutdown/auto-restart circuit turns the power  
supply on and off at an auto-restart duty cycle of typically 4% if  
an out of regulation condition persists. Loss of regulation  
interrupts the external current into the CONTROL pin. VC  
regulation changes from shunt mode to the hysteretic auto-  
restart mode as described in CONTROL pin operation section.  
When the fault condition is removed, the power supply output  
becomes regulated, VC regulation returns to shunt mode, and  
normal operation of the power supply resumes.  
Using Feature Pins  
FREQUENCY (F) Pin Operation  
The FREQUENCY pin is a digital input pin. Shorting the  
FREQUENCY pin to SOURCE pin selects the nominal switching  
frequency of 400 kHz (Figure 9) which is suited for most  
applications. For other applications that may benefit from lower  
switching frequency, a 300 kHz switching frequency can be  
selected by shorting the FREQUENCY pin to the CONTROL pin  
(Figure 10). This pin should not be left open.  
Hysteretic Over-Temperature Protection  
Over temperature protection is provided by a precision analog  
circuit that turns the output MOSFET off when the junction  
temperature exceeds the thermal shutdown temperature  
Line-Sense and External Current Limit Pin Table*  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
Figure Number ➧  
Three Terminal Operation  
Undervoltage  
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
Overvoltage  
✓
Line Feed-Forward (DCMAX  
Overload Power Limiting  
External Current Limit  
Remote ON/OFF  
)
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
Synchronization  
✓
*This table is only a partial list of many LINE-SENSE and EXTERNAL CURRENT LIMIT Pin Configurations that are possible.  
Table 2.  
Typical LINE-SENSE and EXTERNAL CURRENT LIMIT Pin Configurations.  
8
Rev. T 12/12  
www.powerint.com  
1...567891011...34

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DPA423G 替代型号

型号 品牌 替代类型 描述 数据表
DPA423GN POWERINT

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