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| BD9C301FJ-LB Datasheet, PDF (10/22 Pages) Rohm – 4.5V to 18V Input, 3.0A Integrated MOSFET Single Synchronous Buck DC/DC Converter | |||
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BD9C301FJ-LB
(d) Over Current Protection
The Over Current Protection operates by using the current mode control to limit the current that flows through the
top MOSFET at each cycle of the switching frequency. When an abnormal state continues, the output is fixed in a
low level.
(e) Error detection (off latch) release method
BD9C301FJ-LB enters the state of off latch when the protection function operates.
To release the off latch state, the VIN pin voltage should be changed to less than UVLO level (=3.8V [Typ] ) or, the
EN pin voltage falls below VENL voltage.
Application Example
VIN
(12V)
Cin1
10μF
R_DW
2.4kΩ
R_UP
7.5kΩ
PGND
1
Cin2
0.1μF
VIN
2
AGND
3
FB
4
BD9C301FJ-LB
SW
L
8
4.7μH
SW
Cout
7
22μFÃ2
EN
6
COMP
5
Rcomp Ccomp
12kΩ 4700pF
VOUT
(3.3V)
Figure 20. Application Circuit
(VIN=12V, VOUT=3.3V)
Input capacitor(Cin1)
Input capacitor(Cin2)
Output capacitor(Cout)
Inductor (L)
10µF/25V
0.1µF/25V
22µF/16V à 2
4.7µH
FB
Vo(V) R_UP [kΩ]
R_DW [kΩ]
5
4.3
0.82
3.3
7.5
2.4
1.8
15
12
1.5
16
18
1.2(Note1)
10
20
1(Note1)
5.1
20
(Note 1) VOUT has restriction with VIN. See page 13.
Maker
TDK
TDK
TDK
TDK
Part No
C3225JB1E106K
C1608JB1H104K
C3216JB1C226M Ã 2
SPM6530-4R7
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111ã»15ã»001
10/19
TSZ02201-0J3J0AJ00540-1-2
21.Feb.2014 Rev.002
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