参数资料
| 型号： | BD9328EFJ-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 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： | 2A |
| 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： | BD9328EFJ-E2DKR |
BD9328EFJ
(3) Design of Feedback Resistance constant
Set the feedback resistance as shown below.
Technical Note
V OUT
0.9V
V OUT =
R1 + R2
R2
? 0.9
[V]
R1
+
ERR
－
FB
R2
Fig.22
● Soft Start Function
An adjustable soft-start function to prevent high inrush current
during start-up is available.
The soft-start time is set by the external capacitor connected to
COMP
ERRAMP
+
+
-
↓
I SS 10μA
SS
C SS
SS pin.
The soft start time is given by;
T SS [s] = 2.2 x Css / I SS
Setting C SS = 0.1μF;
T SS = 2.2 x 0.1μ / 10μ = 22 [ms]
Please confirm the overshoot of the output voltage and inrush
current when deciding the SS capacitor value.
Fig.23
● EN Function
VIN
The EN terminal control IC’s shut down.
EN
66 k ? (typ.)
91 k ? (typ.)
Leaving EN terminal open makes IC shutdown.
To start the IC, EN terminal should be connected to VIN or the
other power source output.
When the EN voltage exceed 1.2V (typ.), the IC start
operating.
(Attention)
Chattering happens if standing lowering speed is slow
when standing of EN pin is lowered.
The reverse current in which the input side and the
ON/OFF
Signal
REN
EN
pressure operation are done from the output side is
generated when chattering operates with the output
voltage remained, and there is a case to destruction.
Please set to stand within 100us when you control
ON/OFF by the EN signal.
This necessity doesn't exist when EN pin is connected
with VIN and EN is not controlled.
The control by open drain MOSFET shown in a left chart
is recommended.
Fig.24
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
10/15
2011.02 - Rev.A
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