参数资料
| 型号： | BD9329AEFJ-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 8HTSOP |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.9 V ~ 12.6 V |
| 输入电压： | 4.2 V ~ 18 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 380kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-HTSOP-J |
| 其它名称： | BD9329AEFJ-E2DKR |
BD9329AEFJ
Technical Note
● Selecting Application Components
(1) Output LC filter constant selection (Buck Converter)
The Output LC filter is required to supply constant current to the output load. A larger value inductance at this filter
results in less inductor ripple current ( ? I L ) and less output ripple voltage. However, the larger value inductors tend to
have less fast load transient-response, a larger physical size, a lower saturation current and higher series resistance.
A smaller value inductance has almost opposite characteristics above.So Choosing the Inductor ripple current ( ? I L )
between 20 to 40% of the averaged inductor current (equivalent to the output load current) is a good compromise.
I L
Fig.18
I OUTMAX + ? I L /2
should not reach
the rated value level
I LR
Inductor averaged current
t
V IN
L
C OUT
Fig.19
V OUT
Setting ? I L = 30% x Averaged Inductor current (2A) = 0.6 [A]
L = V OUT ? (V IN - V OUT ) x
1
V IN x F OSC x ? I L
= 10μ [H]
Where V IN = 12V, V OUT = 3.3V, F OSC = 380 kHz,
; F OSC is a switching frequency
Also the inductor should have the higher saturation current than I OUTMAX + ? I L / 2.
The output capacitor C OUT affects the output ripple-voltage. Choose the large capacitor to achieve the small
ripple-voltage enough to meet the application requirement.
Output ripple voltage ? V RPL is calculated by the following equation.
? V RPL =
? I L ? ( R ESR +
1
8x C OUT x F OSC
) [V]
Where R ESR is a parasitic series resistance in output capacitor.
Setting C OUT = 20μF, R ESR = 10m Ω
? V RPL = 0.6 x (10m + 1 / (8 x 20u x 380k)) = 15.8mV
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
8/15
2011.02 - Rev.A
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