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参数资料
| 型号： | L6562ATN |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDIP8 |
| 封装： | ROHS COMPLIANT, DIP-8 |
| 文件页数： | 7/25页 |
| 文件大小： | 488K |
| 代理商： | L6562ATN |
Application information
L6562AT
15/25
7.4
Operating with no auxiliary winding on the boost inductor
To generate the synchronization signal on the ZCD pin, the typical approach requires the
connection between the pin and an auxiliary winding of the boost inductor through a limiting
resistor. When the device is supplied by the cascaded DC-DC converter, it is necessary to
introduce a supplementary winding to the PFC choke just to operate the ZCD pin.
Another solution could be implemented by simply connecting the ZCD pin to the drain of the
power MOSFET through an R-C network as shown in figure 3: in this way the high-
frequency edges experienced by the drain will be transferred to the ZCD pin, hence arming
and triggering the ZCD comparator.
Also in this case the resistance value must be properly chosen to limit the current
sourced/sunk by the ZCD pin. In typical applications with output voltages around 400 V,
recommended values for these components are 22 pF (or 33 pF) for CZCD and 330 kΩ for
RZCD. With these values proper operation is guaranteed even with few volts difference
between the regulated output voltage and the peak input voltage
Figure 20.
ZCD pin synchronization without auxiliary winding
L6562AT
CZCD
RZCD
5
ZCD
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相关代理商/技术参数 |
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| L6562D | 功能描述:功率因数校正 IC Trans Mode PFC Cont RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6562DTR | 功能描述:功率因数校正 IC Trans Mode PFC Cont RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6562DTR☞㊣☜ | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:深创辉科技L6562DTR☞㊣☜现货 |
| L6562N | 功能描述:功率因数校正 IC Trans Mode PFC Cont RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L6563 | 功能描述:功率因数校正 IC POWER SUPPLY RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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