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參數(shù)資料
| 型號： | NCP5214AMNR2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2−in−1 Notebook DDR Power Controller |
| 中文描述： | 3 A SWITCHING CONTROLLER, 460 kHz SWITCHING FREQ-MAX, DSO22 |
| 封裝： | LEAD FREE, DFN-22 |
| 文件頁數(shù)： | 26/31頁 |
| 文件大?。?/td> | 376K |
| 代理商： | NCP5214AMNR2G |
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NCP5214A
http://onsemi.com
26
Thus, standard value of 7.5 k 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:
C2
2
1.8 H
7.5 k
440 F
7.5 nF
(eq. 58)
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
7.5 k
8.2 nF
7.5 m
440 F
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.
C1
464.9 pF
(eq. 59)
1
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
400 kHz
1.8 H
R4
440 F1
125
(eq. 60)
Thus, standard value of 130 is selected for R
4
.
Then, C
3
can be calculated by:
1
130
Therefore, standard value of 5.6 nF is selected for C
3
.
C3
400 kHz
6.12 nF
(eq. 61)
Then, the close loop phase margin can be estimated by the following:
Phase(TypeIII)
90
tan1(2
100 kHz
7.5 k
8.2 nF)
(eq. 62)
tan12
100 kHz
7.5 k
180 pF
180 pF
130
8.2 nF
8.2 nF
5.6 nF)
tan1(2
tan1(2
100 kHz
(4.3 k
)
100 kHz
130
5.6 nF)
20.57
°
Phase(Filter)
tan1(2
100 kHz
7.5 m
440 F)
tan1
2
100 kHz
7.5 m
(2
100 kHz)2
1.8 H
440 F1
150.47
°
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 resistor is chosen as the highside resistor
R
1
, the resistance value of lowside resistor R
2
can be
calculated by:
0.8
4.3 k
1.8 V0.8 V
R2
3.44 k
(eq. 63)
Therefore, a 3.44 k resistor is selected for the lowside
feedback resistor R
2
.
g.Calculate softstart capacitor value for the desired
400 s VDDQ softstart time:
4.0 A
0.8 V
Therefore, 2.0 nF X5R ceramic capacitor is selected for
the softstart capacitor.
CSS
400 s
2.0 nF
(eq. 64)
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| NCP5214EVB | 功能描述:電源管理IC開發(fā)工具 ANA NCP5214 EVAL BRD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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| NCP5215MNR2G | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 BUCK CONTROLLER RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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