参数资料
型号: BD8314NUV-E2
厂商: Rohm Semiconductor
文件页数: 12/17页
文件大小: 0K
描述: IC REG BOOST ADJ 2.5A SON10
标准包装: 3,000
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 4 V ~ 12 V
输入电压: 3 V ~ 12 V
频率 - 开关: 1.2MHz
电流 - 输出: 2.5A
同步整流器:
工作温度: -25°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-VFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: VSON010V3030
BD8314NUV
Technical Note
[2]Cs and Rs setting
In the step-up DC/DC converter, the secondary pole point is caused by the coil and capacitor as expressed by the
following equation.
f LC ?
1 ? D
2 π ? LC ?
???? (4)
D: ON Duty = ( V OUT - V IN ) / V OUT
This secondary pole causes a phase rotation of 180°. To secure the stability of the system, put zero points in 2
places to perform compensation.
Zero point by built-in CR
fz 1 ?
1
2 π R 4 C 2
? 13 kHz
???? (5)
Zero point by Cs
fz 1 ?
1
2 π ? R 1 ? R 3 ? C S
???? (6)
Setting C S to be half to 2 times a frequency as large as f LC provides an appropriate phase margin.
It is desirable to set Rs at about 1/20 of (R 1 +R 3 ) to cancel any phase boosting at high frequencies.
Those pole points are summarized in the figure below. The actual frequency property is different from the ideal
calculation because of part constants. If possible, check the phase margin with a frequency analyzer or network
analyzer, etc.. Otherwise, check for the presence or absence of ringing by load response waveform and also
check for the presence or absence of oscillation under a load of an adequate margin.
(5) (6)
(3)
(4)
Fig. 36 Example of DC/DC converter frequency property
(Measured with FRA5097 by NF Corporation)
www.rohm.com
? 2013 ROHM Co., Ltd. All rights reserved.
12/14
2013.12 - Rev.F
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