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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  
2
VIN UVLO  
This is the input low voltage protection block.  
When the VIN pin voltage becomes VUVLO1 or less, the IC detects VIN UVLO and stops the switching operation.  
When the VIN pin voltage becomes VUVLO2 or more, the IC releases VIN UVLO and starts the switching operation.  
During tSS from the start of switching operation, the output voltage gradually rises due to the soft start function.  
VIN pin voltage  
VUVLO2  
VUVLO1  
0 V  
tSS  
Setting output voltage  
Setting output voltage × 0.9  
Output voltage  
Switching  
ON  
ON  
Figure 2. VIN UVLO Timing Chart  
3
EN OVP  
This is the SDX/EN pin voltage over voltage protection block.  
When the SDX/EN pin voltage becomes VENOVP1 or more, the IC detects EN OVP and stops the switching operation.  
When the SDX/EN pin voltage becomes VENOVP2 or less, the IC releases EN OVP and starts the switching operation.  
During tSS from the start of switching operation, the output voltage gradually rises due to the soft start function.  
Figure 3. EN OVP Timing Chart  
Refer Application Examples:7 Enable OVP Detect Voltage and Enable OVP Release Voltage for the enable control by  
the VIN pin.  
4
SOFT START  
When the SDX/EN pin voltage becomes VEN1 or more and enable status, the comparison voltage in the comparator  
block transits slowly 0 V to VINTREF. This operation prevents the IC from rushing current at the rising edge of the output  
voltage or overshooting of the output voltage. The soft start time is fixed to tSS in the IC.  
5
COMPARATOR  
In this block, the IC compares the reference voltage to the REF pin voltage that is the feedback voltage of the SW pin  
voltage. This IC is superior to the response for fluctuation in load because it constitutes the feedback loop by the  
comparator.  
www.rohm.com  
© 2021 ROHM Co., Ltd. All rights reserved.  
TSZ22111 • 15 • 001  
TSZ02201-0F1F0BZ00020-1-2  
08.Jul.2021 Rev.001  
4/36  

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