BD9305AFVM Datasheet, PDF (11/15 Pages) Rohm – Single-output Step-up,High-efficiency Switching Regulator(Controller Type)

BD9306AFVM, BD9305AFVM
Technical Note
Example of application
※We recommend the application circuit examples with confidence, but hope that you will thoroughly check the characteristics
over again when putting them to use.
When you change the external circuit constant and use, please make a decision to leave a sufficient margin after taking
into consideration the deviation etc. of external components and ROHM IC, in terms of not only the static characteristic but
also the transient characteristic.
Moreover, please understand that our company can not confirm fully with regard to the patent right.
＜Master Slave Function＞
The master slave function, which is that the synchronous switching is possible by using these IC of BD9305AFVM /
BD9306AFVM through their multi-connection, is mounted. The following drawing shows an example of connection circuit
in which BD9305AFVM is connected on the master side and BD9306AFVM is connected on the slave side.
VCC
CTL1
BD9305AFVM
(Master Side)
CTL2
BD9306AFVM
(Slave Side)
CTL0
Vo2
RT
CT
Vo1
Fig.31 Master Slave Application Circuit
In the above-mentioned circuit, BD9306AFVM, which is synchronized with the switching frequency determined by RT and
CT of BD9305AFVM that is the master, operates.In addition, the ON/OFF of output can be controlled by connecting the
switch to the COMP terminal. (Refer to the following table)
Output state
Control signal correspondence table
Control signal
Vo1
Vo2
OFF
OFF
OFF
ON
ON
OFF
ON
ON
＊The same in either case of High / Low.
CTL0
Low
High
High
High
CTL1
＊
High
Low
Low
CTL2
＊
Low
High
Low
Similarly in the case of connecting three or more than three, synchronization is possible by connecting the CT terminal of
Master and the CT terminal of Slave
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© 2009 ROHM Co., Ltd. All rights reserved.
11/14
2009.05 - Rev.A