参数资料
| 型号： | BD8629FS-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPP 2A W/FET SSOP-A16 |
| 标准包装： | 2,500 |
| 应用： | 控制器，平面电视 |
| 输入电压： | 4.5 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： | 16-LSOP（0.175"，4.40mm 宽） |
| 供应商设备封装： | 16-SSOPA |
| 包装： | 带卷 (TR) |
BD8629FS
Technical Note
Under voltage lock out protection (UVLO)
As for BD8629FS, the power-supply voltage decrease detection protection circuit is built in.
It the input voltage decrease below the UVLO voltage (4.0V typ), the device state changes to the standby mode (Moreover,
to prevent the chattering of the output) hysteresis width of 300mV(typ) has been installed in the UVLO cancel voltage.
RT terminal open/short protection function (RTO/RTS)
RT terminal opening/short protection function prevent the clock from abnormal oscillation.
If RT terminal open/short protection function is detected, output voltage changes to low level and is fixed.
Terminal RT opening/short protection function is always effective after the power supply start-up.
Terminal RT opening/short protection function is available if the state continue for 500usec, abnormal detection operates
when the state continues about 500 μ sec(typ).
Soft start time-out function
If VSS doesn't exceed VSSTH within 64msec (typ) since a soft start began, BD8629FS controls an off latch.
Vo is fixed in a low level.
Fig. 6 Soft start time-out
Error detection (off latch) release method
BD8629FS enters the state of an off latch when the protection function operates.
To release the off latch state, EN terminal voltage should be changed to low level once time.
Thermal shut down function
Thermal shut down circuit (TSD circuit) is built into BD8629FS. When the temperature of the chip exceeds Tjmax=175, the
DC/DC converter is fixed in a low voltage.
TSD function is aimed to shut down IC from thermal reckless driving under an abnormal state to exceed Tjmax=175.
It aims at neither protection nor the guarantee of the set. Therefore, please do not use this function to protect the set.
Over current protection function
The over current protection function has been achieved by limiting the current that flows on high side MOSFET.
The current is controlled in every one cycle of the switching frequency. When an abnormal state continues for about
500 μ sec(typ), the output is fixed in a low level.
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? 2009 ROHM Co., Ltd. All rights reserved.
10/11
2009.05 - Rev.A
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