参数资料
| 型号： | BD8643FV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 5/16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
● Operation description
1 Enable control
The device can be controlled ON/OFF by EN terminal (15 pin) voltage.
An internal circuit starts when VEN reaches 1.4V.
When standing up of VIN is too steep (1msec or less), a defective start might be caused according to the state of Pascon
between GND substrate pattern and power supply-when the terminal EN is short-circuited to the terminal VIN and it is used.
V EN
EN terminal
V ENH
V ENL
0
V SS
V SSCLM
SS terminal
V SSTH
0
V O
Output setting voltage
0
t SS
Fig.12 ON/OFF transition wave form in EN controlling
2 Soft start time set function
As for BD8643FV, output can do soft start without overshoot by charging soft start capacity (C SS ) connected between
SS/DELAY (9 pin) and GND (10 pin) terminal.
Also, soft start time (tss) can be set by setting soft start capacity (C SS ) arbitrarily.(Refer to 5-2 soft start time setting method)
3 OSC oscillation frequency setting function
The output oscillation frequency can be set by connecting resistance between terminal RT (13 pin) and GND
(range = 100kHz – 600kHz)
The relation between RT terminal resistance and the oscillation frequency follows Fig.13.
10000
1000
100
10
1
10
100
1000
RT[k Ω]
Fig.13 Oscillation frequency setting by RT resistance
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
5/13
2010.09 - Rev.A
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相关代理商/技术参数 |
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| 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 |
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