参数资料
| 型号： | NCP5218MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 26/31页 |
| 文件大小： | 0K |
| 描述： | IC DDR PWR CTLR 2IN2 NTBK 22-DFN |
| 产品变化通告： | Product Obsolescence 30/Sept/2009 |
| 标准包装： | 2,500 |
| 应用： | 控制器，DDR |
| 输入电压： | 4.5 V ~ 24 V |
| 输出数： | 2 |
| 输出电压： | 可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 22-VFDFN 裸露焊盘 |
| 供应商设备封装： | 22-DFN（6x5） |
| 包装： | 带卷 (TR) |
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NCP5218
2 1.8 m H 440 m F
C2 +
+ 7.5 nF
C1 +
+ 464.9 pF
7.5 k W
8.2 nF * 1
R4 +
+ 125 W
+ 6.12 nF (eq. 61)
C3 +
Thus, standard value of 7.5 k W is selected for R 3 .
If the first zero break frequency is placed at half the LC
filter ’s double pole, the value of C 2 can be calculated by:
(eq. 58)
7.5 k W
Thus, standard value of 8.2 nF is chosen for C2.
If the 1st pole break frequency is placed at the LC filter ’s
ESR zero, the value of C 1 can be calculated by:
8.2 nF
(eq. 59)
7.5 m W 440 m F
Then, if the second zero break frequency is placed at the LC
filter’s double pole and the second pole is placed at half the
switching frequency, the value of R 4 can be calculated by:
4.3 k W
p 400 kHz 1.8 m H 440 m F ? 1
(eq. 60)
Thus, standard value of 130 W is selected for R 4 .
Then, C 3 can be calculated by:
1
p 130 W 400 kHz
Therefore, standard value of 5.6 nF is selected for C 3 .
Thus, standard value of 470 pF can be chosen for C 1 .
However, 180 pF is selected for more phase boost at the
0 dB gain crossing.
Then, the close loop phase margin can be estimated by the following:
Phase(Filter) + ? tan ? 1(2 p
100 kHz
7.5 m W
440 m F)
? tan ? 1
+ ? 150.47 °
(2 p
2 p 100 kHz 7.5 m W
100 kHz)2 1.8 m H 440 m F ? 1
? tan ? 1 2 p
100 kHz
7.5 k W
Phase(TypeIII) + ? 90 ) tan ? 1(2 p 100 kHz 7.5 k W 8.2 nF)
180 pF 8.2 nF
180 pF ) 8.2 nF
(eq. 62)
) tan ? 1(2 p
100 kHz
(4.3 k W ) 130 W )
5.6 nF)
? tan ? 1(2 p
100 kHz
130 W
5.6 nF)
+ 20.57 °
Phase(closeloop) + ? 150.47 ° ) 20.57 ° + ? 129.90 °
Phase(margin) + Phase(closeloop) ? ( ? 180 ° ) + ? 129.90 ° ? ( ? 180 ° ) + 50.10 °
Therefore, the phase margin is large enough for stability.
f. Calculate the resistance value of feedback resistor
divider:
Therefore, a 3.44 k W resistor is selected for the low ? side
feedback resistor R 2 .
g. Calculate soft ? start capacitor value for the desired
CSS +
Since a 4.3 k W resistor is chosen as the high ? side resistor
R 1 , the resistance value of low ? side resistor R 2 can be
calculated by:
400 m s VDDQ soft ? start time:
4.0 m A 400 m s
0.8 V
+ 2.0 nF
(eq. 64)
R2 + 0.8 4.3 k W + 3.44 k W
1.8 V ? 0.8 V
(eq. 63)
Therefore, 2.0 nF X5R ceramic capacitor is selected for
the soft ? start capacitor.
http://onsemi.com
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相关代理商/技术参数 |
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| NCP5220 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:3−in−1 PWM Dual Buck and Linear Power Controller |
| NCP5220AMNR2 | 功能描述:DC/DC 开关控制器 3-in-1 PWM Dual Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP5220AMNR2G | 功能描述:DC/DC 开关控制器 ANA DDR PWER CNTRLR RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP5220MNR2 | 功能描述:DC/DC 开关控制器 3-in-1 PWM Dual Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP5220MNR2G | 功能描述:DC/DC 开关控制器 3-in-1 PWM Dual Buck Linear DDR RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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