参数资料
| 型号： | BD9302FP-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A DL HSOP25 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 14.4 V |
| 输入电压： | 6 V ~ 18 V |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 25-SOP（0.213"，5.40mm）+ 2 翼片 |
| 包装： | 标准包装 |
| 供应商设备封装： | 25-HSOP |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD9302FP-E2DKR |
External component setting procedure
(1) Setting of output L constant
The coil L used for output is determined according to the rated current I LR and the maximum load current value I OMAX
of the coil.
I L
Adjust so that (IOMAX + D I L ) will
not conflict with the rating.
I LR
V CC
Average I OMAX current
L
I L
C O
V O
t
Fig.22
Fig.23
Adjust so that (I OMAX + DI L ) will not conflict with the rating. At this time, DI L can be obtained according to the formula
shown below.
￥ (V CC – V O ) ￥ ￥
Step-down DI L =
1
L
V O
V CC
1
f
[A] . . . (1.1)
,where f: Switching frequency
Furthermore, since the coil L value may also vary by approximately ±30%, set this value with an adequate margin. If the
coil current I L exceeds the rated coil current I LR , the internal IC element may be damaged. It is recommended to make
setting of coil value in the range of 4.7 μ F to 100 μ F.
(2) Setting of output Co constant
For output capacitor, select the allowable ripple voltage V PP or the allowable drop voltage at a sharp change of load,
whichever larger for the capacitor. The output ripple voltage can be obtained according to the formula shown below.
Step-down D V PP = D I L ￥ R ESR + D I L ￥ V O ￥ 1
2C O V CC f
[V]
,where f: Switching frequency
Design the component so that this constant will fall within the allowable ripple voltage.
Furthermore, estimate the drop voltage V DR at a sharp change of load according to the formula shown below.
V DR =
D I
C O
￥ 10 μ sec
[V]
However, 10 μ sec will be the estimated value of the DC/DC converter response speed.
Make setting of capacitance with thorough consideration given to the margin so that these two values will fall into the
specified values. It is recommended to make setting of the capacitance in the range of 10 μ F to 100 μ F. if a short circuit
occurs, an inverse current passes through the parasitic diode to cause damage to the internal circuits. To prevent that,
insert a backflow prevention diode.
9/16
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