参数资料
| 型号： | BD8643FV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 8/16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
● External parts setting method
1 Output voltage setting method
The output voltage can be arbitrarily set by external resistance.
Technical Note
Vo ?
(R1 ? R2)
R2
VREF
Please select the constant of R1 and R2 by this expression.
Please select the current that flows to R1 and R2 to become much smaller than output current.
Vo
R1
FB
R2
VREF=0.8V
Fig.16 Output voltage setting circuit
2 Soft start time setting method
BD8643FV can soft start without overshoot because of a charge current to the soft start capacitance (CSS).
The soft start time can be set by connecting soft start capacity (CSS).
When the EN terminal voltage is set VIN_EN or more, the charge to the capacity between SS/DELAY and GND terminal is
begun. The output voltage becomes soft start in proportion to a SS/DELAY terminal voltage rising. When the SS/DELAY
terminal voltage exceeds VSSTH, the output voltage is fixed in a setting value.
Please set soft start time (tss) in 1msec-52.5msec.
T VO ? TW EN ( ? 50 μ s ) ?
①
V OST ( ? 0 . 6 V ) ? C SS
I SS ( ? 4 μ A )
②
?
(V SSTH ? V OST ) ? C SS
I SS ( ? 4 μ A )
③
VENH
EN terminal
0V
①
TW EN
(=50μsec)
V SSTH(=1.4V[typ])
SS terminal
0V
②
V OST(=0.6V[typ])
Min.
35μsec
T W EN SPE C
Typ.
50μsec
Max.
75μsec
Output setting voltage
0V
③
T VO
Fig.17 Soft start
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
8/13
2010.09 - Rev.A
相关PDF资料 |
PDF描述 |
|---|---|
| BD8649EFV-E2 | IC REG BUCK SYNC ADJ HTSSOPB20 |
| BD8963EFJ-E2 | IC REG BUCK SYNC ADJ 3A 8HTSOP |
| BD8964FVM-TR | IC REG BUCK SYNC ADJ 1.2A MSOP8 |
| BD8966FVM-TR | IC REG BUCK SYNC ADJ 0.8A MSOP8 |
| BD91361MUV-E2 | IC REG BUCK SYNC ADJ 4A 20VQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| BD8645EFV | 制造商:ROHM 制造商全称:Rohm 功能描述:Synchronous rectification with built-in FET type DC/DC converter IC |
| BD8646FV | 制造商:ROHM 制造商全称:Rohm 功能描述:Flexible Step-down Switching Regulator with Built-in Power MOSFET |
| BD8646FV_10 | 制造商:ROHM 制造商全称:Rohm 功能描述:Flexible Step-down Switching Regulator with Built-in Power MOSFET |
| BD8646FV-E2 | 制造商:ROHM 制造商全称:Rohm 功能描述:Flexible Step-down Switching Regulator with Built-in Power MOSFET |
| BD8649EFV | 制造商:ROHM 制造商全称:Rohm 功能描述:Flexible Step-down Switching Regulator with Built-in Power MOSFET |
发布紧急采购，3分钟左右您将得到回复。