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BD7J201EFJ-LB PDF预览

BD7J201EFJ-LB

更新时间: 2023-09-03 20:25:15
品牌 Logo 应用领域
罗姆 - ROHM 变压器光电转换器
页数 文件大小 规格书
39页 1397K
描述
本产品是能够保证向工业设备市场长期供应的产品,是不需要光耦的隔离型反激式转换器。使用本产品,将不再需要以往应用中为了获得稳定的输出电压而需要的由光电耦合器或变压器辅助绕组组成的反馈电路。此外,通过采用ROHM自有的自适应导通时间控制技术,也不再需要外置相位补偿器件,从而可以使隔离式电源设计所需的元器件数量显著减少,并且能够实现小型化和更高可靠性。

BD7J201EFJ-LB 数据手册

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BD7J201HFN-LB (Under Development) BD7J201EFJ-LB  
Description of Blocks – continued  
10 SCP, OVP  
This is the block of the short circuit protection and over voltage protection.  
10.1 SCP (Short Circuit Protection)  
The REF pin obtains the secondary output voltage data from the primary flyback voltage. When the REF pin  
voltage becomes VSCP or less at the switching MOSFET off, the IC detects SCP and the switching operation is  
stopped. The time of tRESTART after the switching operation stopped, the switching operation is restarted. The soft  
start function works and the output from restart of the switching operation to the time of tSS, and the output voltage  
rises slowly.  
To prevent detection error, the detection of SCP is invalidated for tMASK2 after the switching MOSFET is turned off  
and for tMASK3 from start of the switching operation.  
tSS  
Setting output voltage  
Setting output voltage × 0.9  
Output voltage  
SW pin voltage  
VSCP  
REF pin voltage  
Switching  
ON  
Figure 7. SCP Timing Chart  
ON  
tRESTART  
10.2 OVP (Over Voltage Protection)  
The REF pin obtains the secondary output voltage data from the primary flyback voltage. When the REF pin  
voltage becomes VOVP or more at the switching MOSFET off, the IC detects OVP and the switching operation is  
stopped. The time of tRESTART after the switching operation stopped, the switching operation is restarted. The soft  
start function works and the output from restart of the switching operation to the time of tSS, and the output voltage  
rises slowly.  
To prevent detection error, the detection of OVP is invalidated for tMASK2 after the switching MOSFET is turned off.  
tSS  
Setting output voltage  
Setting output voltage× 0.9  
Output voltage  
SW pin voltage  
VOVP  
REF pin voltage  
ON  
ON  
Switching  
tRESTART  
Figure 8. OVP Timing Chart  
www.rohm.com  
© 2021 ROHM Co., Ltd. All rights reserved.  
TSZ22111 • 15 • 001  
TSZ02201-0F1F0BZ00020-1-2  
08.Jul.2021 Rev.001  
7/36  

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