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| 型号： | BD9007HFP |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 505 kHz SWITCHING FREQ-MAX, PSSO7 |
| 封装： | ROHS COMPLIANT, HRP-7 |
| 文件页数： | 2/18页 |
| 文件大小： | 484K |
| 代理商： | BD9007HFP |
BD9006F, BD9006HFP, BD9007F, BD9007HFP
Technical Note
10/17
www.rohm.com
2009.05 - Rev.A
2009 ROHM Co., Ltd. All rights reserved.
●
Description of external components
Fig.23
Design Procedure
Sample Calculations
Vo=Output voltage, VIN (Max.)=Maximum input voltage
Io (Max.)=Maximum load current, f=Oscillation frequency
When Vo=3.3V, VIN (Typ.)=13.2V
Io(Max.)=1A and f=300kHz
1. Setting or output voltage
Output voltage can be obtained by the formula shown below:
Vo=0.8×(1+R1/R2)
Use the formula to select the R1 and R2.
Furthermore, set the R2 to 30k or less.
Select the current passing through the R1 and R2 to be small
enough for the output current.
When VO=3.3V and R2=15k
3.3=0.8×(1+R1/15k)
R1=46.875k≒47k
R1=47k
2. Selection of coil (L1)
The value of the coil can be obtained by the formula shown
below:
L1=(VIN-Vo)×Vo / (VIN×f×Io)
Io: Output ripple current
Io should typically be approximately 20 to 30% of Io.
If this coil is not set to the optimum value, normal (continuous)
Oscillation may not be achieved. Furthermore, set the value of
the coil with an adequate margin so that the peak current
passing through the coil will not exceed the rated current of the
coil.
When VIN=13.2V, Vo=3.3V, Io=1A and f=300kHz,
L1=(13.2-3.3)×3.3/{13.2×300k×(1×0.3)}
=27.5H≒33H
L1=33H
3. Selection of output capacitor (Co)
The output capacitor can be determined according to the
output ripple voltage Vo(p-p) required. Obtain the required
ESR value by the formula shown below and then select the
capacitance.
IL=(VIN-Vo)×Vo/(L×f×VIN)
Vpp=IL×ESR+(IL×Vo)/(2×Co×f×VIN)
Set the rating of the capacitor with an adequate margin to the
output voltage. Also, set the maximum allowable ripple current
with an adequate margin to IL. Furthermore, the output rise
time should be shorter than the soft start time. Select the
output capacitor having a value smaller than that obtained by
the formula shown below.
CMAX =
3.0m×(ILIMIT-Io(Max))
Vo
ILIMIT：2A (BD9006F,BD9006HFP, BD9007F,BD9007HFP)
If this capacitances is not optimum, faulty startup may result.
(※3.0m is soft start time(min).)
VIN=13.2V, Vo=3.3V, L=33H, f=300kHz
IL=(13.2-3.3)×3.3/(33×10
-6×300×103×13.2)
=0.25
IL=0.25A
When ILIMIT: 2A, Io(Max)=1A, Vo=3.3V
CMAX =3.0m×(2-1)/3.3
≒
910
CMAX=910F
VIN
RT
EN/SYNC
FB
SW
INV
GND
＋
RT
CIN
C28
C1
R3
D1
L1
Co
R1
R2
Vo
VIN
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