参数资料
| 型号： | BD8643FV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 20SSOP |
| 标准包装： | 2,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 12.6 V |
| 输入电压： | 4.5 V ~ 18 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz ~ 600kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-LSSOP（0.240"，6.10mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-SSOP-B |
BD8643FV
Technical Note
● Protection function
Protection circuit is effective for destruction prevention due to accident so that avoid using under continuous protection
operation.
1 Low voltage protection function (LVP)
The voltage of the terminal FB (11pin) is compared with internal reference voltage VREF.
If FB terminal voltage falls below V LVP (= VREF -120mV) and the state continues, output changes to low voltage and the
state is fixed.
Table 1 output low voltage protection function
EN terminal
>V ENH
<V ENL
SS terminal
>1.4V(typ)
<1.4V(typ)
-
FB terminal
＜ V LVP
＞ V LVP
-
-
Low voltage
Protection function
Effective
Invalidity
Invalidity
Low voltage
Protection operation
ON
OFF
OFF
OFF
※ Low voltage protection function is available when SS terminal voltage becomes more than 1.4V (typ) in the transition to ON control (during soft start).
2 Over voltage protection function (OVP)
The voltage of the terminal FB is compared with internal reference voltage VREF.
If FB terminal voltage is over Vovp (=VREF +120mV) and the state is continues, output changes to low voltage and the
state is fixed.
Table 2 output low voltage protection function
EN terminal
>V ENH
<V ENL
SS terminal
>1.4V(typ)
<1.4V(typ)
-
FB terminal
＞ V OVP
＜ V OVP
-
-
Low voltage
Protection function
Effective
Invalidity
Invalidity
Low voltage
Protection operation
ON
OFF
OFF
OFF
※ Over voltage protection function is available when SS terminal voltage becomes more than 1.4V (typ) in the transition to ON control (during soft start).
V FB
VREF ＋ 120 ｍ V
FB terminal voltage
VREF
VREF-120 ｍ V
0
ON
Protection
OFF
LVP
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
OVP
Fig.14 Output voltage error detection range
6/13
LVP
2010.09 - Rev.A
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