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參數(shù)資料
| 型號： | NCP1422MNR2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 800 mA Sync−Rect PFM Step−Up DC−DC Converter with True−Cutoff and Ring−Killer |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, 0.50 MM PITCH, LEAD FREE, PLASTIC, DFN-10 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 142K |
| 代理商： | NCP1422MNR2G |
NCP1422
http://onsemi.com
12
From the previous calculations, you need at least 18.75
F in order to achieve the specified ripple level at the
conditions stated. Practically, a capacitor that is one level
larger is used to accommodate factors not taken into
account in the calculations. Therefore, a capacitor value of
22 F is selected. The NCP1422 is internally compensated
for most applications, but in case additional compensation
is required, the capacitor C4 can be used as external
compensation adjustment to improve system dynamics.
In order to provide an easy way for customers to select
external parts for NCP1422 in different input voltage and
output current conditions, values of inductance and
capacitance are suggested in Figures 24, 25 and 26.
0
2
4
6
8
10
12
1.8
2.0
2.2
2.4
2.6
2.8
3.0
Figure 24. Suggested Inductance of V
OUT
= 3.3 V
Figure 25. Suggested Inductance of V
OUT
= 5.0 V
Figure 26. Suggested Capacitance for Output Capacitor
INPUT VOLTAGE (V)
I
I
OUT
= 700 mA
0
2.2
3
6
9
12
2.5
2.8
3.1
3.4
3.7
4.0
INPUT VOLTAGE (V)
I
OUTPUT CURRENT (mA)
C
40
35
30
25
20
15
10
5
0
100
200
300
400
500
600
700
800
I
OUT
= 700 mA
25
33
50
100
C
V
OUTRIPPLE
= 45 mA
Table 1. Suggestions for Passive Components
Output Current
Inductors
Capacitors
800 mA
Sumida CR43, CR54,CDRH6D28 series
Panasonic ECJ series
Kemet TL494 series
250 mA
Sumida CR32 series
Panasonic ECJ series
Kemet TL494 series
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