参数资料
| 型号： | BD8314NUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 11/17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： | 无 |
| 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
(4) DC/DC converter frequency response adjustment system
Condition for stable application
The condition for feedback system stability under negative feedback is that the phase delay is 135 °or less when
gain is 1 (0 dB).
Since DC/DC converter application is sampled according to the switching frequency, the bandwidth GBW of the
whole system (frequency at which gain is 0 dB) must be controlled to be equal to or lower than 1/10 of the switching
frequency.
In summary, the conditions necessary for the DC/DC converter are:
- Phase delay must be 135°or lower when gain is 1 (0 dB).
- Bandwidth GBW (frequency when gain is 0 dB) must be equal to or lower than 1/10 of the switching frequency.
To satisfy above two items, R 1 , R 2 , R 3 , C S and R S in Fig. 35 should be set as follows.
[1] R 1 , R 2 , R 3
VOUT
BD8314NUV incorporates phase compensation devices of
R4=62 k ? and C2=200pF. These C2 and R 1 , R 2 , and R 3
values decide the prim ary pole that determines the
bandwidth of DC/DC converter.
Primary pole point frequency
R1
R2
Cs
Rs
R3
Inside of IC
R4 C2
FB
fp=
2 π A × (
1
R 1 ? R 2
R 1 +R 2
+R 3 ) × C 2
???? (1)
Fig.35 Example of phase compensation setting
DC Gain ? A ? ?
DC/DC converter DC Gain
1 V OUT
B V OUT ? V IN
???? (2)
A
B
V IN
V OUT
: ERROR AMP Gain
About 100dB = 10 5
: Oscillator amplification = 0.5V
: Input voltage
: Output voltage
By Equations (1) and (2), the frequency f sw of point 0 dB under limitation of the bandwidth of the DC gain at the
primary pole point is as shown below.
2 π C 2 ? ?
? R 3 ?
? ?
f SW ? fp ? DC Gain ?
1
? R 1 ? R 2
? R 1 ? R 2
?
?
1
B
V OUT
V OUT ? V IN
???? (3)
It is recommended that f sw should be approx.10 kHz. When load response is difficult, it may be set at approx. 20
kHz. By this setting, R 1 and R 2 , which determine the voltage value, will be in the order of several hundred k ? .
Therefore, if an appropriate resistance value is not available and routing may cause noise, the use of R 3 enables
easy setting.
www.rohm.com
? 2013 ROHM Co., Ltd. All rights reserved.
11/14
2013.12 - Rev.F
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