参数资料
型号: BD8649EFV-E2
厂商: Rohm Semiconductor
文件页数: 5/16页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ HTSSOPB20
标准包装: 2,500
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:
工作温度: -20°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-VSSOP(0.173",4.40mm 宽)
包装: 带卷 (TR)
供应商设备封装: 20-HTSSOP-B
BD8649EFV
Technical Note
● Operation description
1 Enable control
The device can be controlled ON/OFF by EN terminal (5 pin) voltage.
An internal circuit starts when VEN reaches 1.6V.
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 BD8649EFV, output can do soft start without overshoot by charging soft start capacity (C SS ) connected between
SS/DELAY (19 pin) and GND (20 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 (3 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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