参数资料
| 型号： | NCP5214AMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 26/31页 |
| 文件大小： | 0K |
| 描述： | IC CTLR NOTEBOOK DDR PWR 22-DFN |
| 产品变化通告： | Product Discontinuation 01/Oct/2008 |
| 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 |
| 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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NCP5214A
C2 + + 7.5 nF
C1 +
+ 464.9 pF
7.5 k W
8.2 nF * 1
R4 +
+ 125 W
C3 +
+ 6.12 nF (eq. 61)
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:
2 1.8 m H 440 m F (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
Phase(TypeIII) + ?90 ) tan ?1(2 p
100 kHz
7.5 k W
8.2 nF)
? tan ?1 2 p
100 kHz
7.5 k W
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:
Since a 4.3 k W resistor is chosen as the high?side resistor
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
400 m s VDDQ soft?start time:
R 1 , the resistance value of low?side resistor R 2 can be
calculated by:
CSS +
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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| NCP5214EVB | 功能描述:电源管理IC开发工具 ANA NCP5214 EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCP5214MNR2 | 功能描述:DC/DC 开关控制器 2-IN-1 NOTBOOK DDR CNTLR 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 |
| NCP5214MNR2G | 功能描述:DC/DC 开关控制器 2-IN-1 NOTBOOK DDR CNTLR 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 |
| NCP5215 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Dual Synchronous Buck Controller for Notebook Power System |
| NCP5215MNR2G | 功能描述:直流/直流开关转换器 BUCK CONTROLLER RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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