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| BD9D321EFJ Datasheet, PDF (12/28 Pages) Rohm – 4.5V to 18V Input, 3.0A Integrated MOSFET 1ch Synchronous Buck DC/DC Converter | |||
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BD9D321EFJ
Datasheet
1-3 Enable Control
The IC shutdown can be controlled by the voltage applied to the EN terminal. When VEN reaches 2.2 V (Typ), the
internal circuit is activated and the IC starts up.
VEN
EN terminal
VENH
VENL
0
t
VOUT
Output setting voltage
0
t
Soft start time
Figure 24. Start-up with EN pin
1-4 Soft Start Function
By turning EN terminal to High, the soft start function operates and it gradually starts output voltage by controlling the
current at start-up. Also soft start function prevents sudden current and over shoot of output voltage. Rising time can
be set by connecting capacitor to SS terminal. For setting the rising time, please refer to page.17.
EN
SS
VOUT
FB
VTH
Td
Tss
Figure 25. Soft Start Timing chart
0.765V
www.rohm.co.jp
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111â¢15â¢001
12/25
TSZ02201-0J3J0AC00490-1-2
07.Aug.2013 Rev.001
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