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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  
6
ADAPTIVE ON TIME CONTROLLER  
This block is corresponded to the original adapter type technology that controls on time.  
Stable load current:  
Operates in the PWM control and fix the on time.  
Fluctuating load current:  
Operates in the on time control and realizes a high-speed load response by  
fluctuates the switching frequency.  
Light load:  
Decrease the switching frequency and realizes a high efficiency.  
When the load current fluctuates, the frequency becomes high. The IC raises the average of primary current by  
shortening the off time and raises the secondary current.  
Output voltage  
Primary coil current  
SW pin voltage  
High  
Frequency  
Stabilize gradually  
Stable operation  
Switching Frequency  
Figure 4. Transient Response Timing Chart  
7
8
DRIVER  
This block drives the switching MOSFET.  
LOAD COMPENSATION  
This block compensates the fluctuation of output voltage caused by the fluctuation of VF characteristic in the secondary  
output diode corresponded to load current. This block monitors the current flowed to the switching MOSFET and pulls  
the current corresponded to the quantity of compensation determined by the external resistor and capacitor at the  
L_COMP pin and time constant from the REF pin. The decrease of the REF pin voltage by the drop of feedback current  
flowing in the external resistor at the REF pin rises the output voltage and it is compensated.  
www.rohm.com  
© 2021 ROHM Co., Ltd. All rights reserved.  
TSZ22111 • 15 • 001  
TSZ02201-0F1F0BZ00020-1-2  
08.Jul.2021 Rev.001  
5/36  

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