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参数资料
| 型号： | NCP5214EVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 26/32页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP5214 |
| 产品变化通告： | Product Obsolescence 24/Jan/2011 |
| 设计资源： | NCP5214EVB BOM NCP5214EVB Gerber Files NCP5214EVB Schematic |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 10A |
| 输入电压： | 5V，4.5 ~ 24 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 100Hz ~ 75kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP5214 |
| 其它名称： | NCP5214EVBOS |
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NCP5214
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
+ ?153.66 °
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) + ?153.66 ° ) 20.57 ° + ?133.09 °
Phase(margin) + Phase(closeloop)?(?180 ° ) + ?133.09 ° ?(?180 ° ) + 46.91 °
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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