参数资料
| 型号： | BD8621EFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 9/17页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPP 3A W/FET HTSSOP-B20 |
| 标准包装： | 2,500 |
| 应用： | 控制器，平面电视 |
| 输入电压： | 2.8 V ~ 6 V |
| 输出数： | 1 |
| 工作温度： | -10°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-HTSSOP-B |
| 包装： | 带卷 (TR) |
BD8621EFV
Technical Note
● Protection function
Protection circuit is effective for destruction prevention due to accident so that avoid using under continuous protection
operation.
Low voltage protection function (LVP)
The voltage of the terminal FB (2 pins) is compared with internal reference voltage VREF.
If FB terminal voltage falls below V LVP (= VREF -60mV) and the state continues for 500us, output changes to low voltage and
the state is fixed. In that case , PDET (3pin) output changes to L.
Table 1 output low voltage protection function
EN terminal
>V ENH
SS terminal
>1.4V(typ)
FB terminal
＜ V LVP
＞ V LVP
Low voltage protection
function
Effective
Low voltage protection
operation
ON
OFF
<1.4V(typ) - Invalidity OFF
<V ENL
- - Invalidity 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).
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 +60mV) and the state is continues for 500usec, output changes to low voltage
and the state is fixed.
Table 2 output overvoltage protection function
EN terminal
>V ENH
SS terminal
>1.4V(typ)
FB terminal
＞ V OVP
＜ V OVP
Over voltage
protection function
Effective
Over voltage
protection operation
ON
OFF
<1.4V(typ) - Invalidity OFF
<V ENL
- - Invalidity 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＋60ｍV
FB terminal voltage
VREF
VREF-60ｍV
0
ON
Protection
OFF
PDET terminal
HIGH
LVP
OVP
LVP
LOW
Fig.4 Output voltage error detection range
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
9/14
2009.05 - Rev.A
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