参数资料
| 型号： | BD8621EFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 8/17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
Soft start time set function
As for BD8621EFV, output can do soft start without overshoot by charging soft start capacity (CSS) connected between SS
and SGND terminal.
Also, soft start time (tss) can be set by setting soft start capacity (CSS) arbitrarily.
OSC oscillation frequency setting function
The output oscillation frequency can be set by connecting resistance between terminal RT (20 pins) and SGND
(range = 250kHz - 1MHz)
The relation between RT terminal resistance and the oscillation frequency follows Fig.3.
1000
10
10
100
1000
10000
RT terminal resistance [k Ω]
Fig.3 RT resistance-oscillation frequency
Switching frequency synchronization
An internal transmitter of BD8621EFV can be synchronized with the external clock signal connected with the terminal
SYNCLK (15 pins).
The frequency of external clock can be set within the range of 250kHz-1MHz. In this case, please set the RT resistance that
may become about -20% value of the external clock frequency.
* Be short-circuited SYNCLK terminal to SGND when a frequency synchronous function is not used.
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? 2009 ROHM Co., Ltd. All rights reserved.
8/14
2009.05 - Rev.A
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相关代理商/技术参数 |
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