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參數資料
| 型號： | NCP1421D |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 600 mA Sync-Rect PFM Step-Up DC-DC Converter Step-Up DC-DC Converter with True-Cutoff and Ring-Killer |
| 中文描述： | 600毫安同步整流PFM升壓型DC - DC轉換器升壓型DC - DC轉換器與True - Cutoff和Ring殺手 |
| 文件頁數： | 12/14頁 |
| 文件大小： | 116K |
| 代理商： | NCP1421D |
NCP1421
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 NCP1421 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 NCP1421 in different input voltage and
output current conditions, values of inductance and
capacitance are suggested in Figure 27, 28 and 29.
0
1.4
2
4
6
8
10
12
14
16
1.8
2.0
2.2
2.4
2.6
2.8
3.0
Figure 27. Suggested Inductance of V
OUT
= 3.3 V
Figure 28. Suggested Inductance of V
OUT
= 5.0 V
Figure 29. Suggested Capacitance for Output Capacitor
1.6
INPUT VOLTAGE (V)
I
I
OUT
= 500 mA
0
1.6
3
6
9
12
15
18
21
2.2
2.5
2.8
3.1
3.4
3.7
4.0
1.9
INPUT VOLTAGE (V)
I
I
OUT
= 500 mA
OUTPUT CURRENT (mA)
C
C
V
OUTRIPPLE
= 45 mV
V
OUTRIPPLE
= 50 mV
V
OUTRIPPLE
= 40 mV
25
33
50
100
40
35
30
25
20
15
10
5
0
200
250
300
350
400
450
500
550
600
Table 1. Suggestions for Passive Components
Output Current
Inductors
Capacitors
500 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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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1421DMR2 | 功能描述:直流/直流開關轉換器 600mA PFM Boost RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| NCP1421DMR2G | 功能描述:DC/DC 開關控制器 600mA PFM Boost w/Ring Killer RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| NCP1421EVB | 功能描述:電源管理IC開發工具 ANA NCP1421 EVAL BRD RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| NCP1421LEDEVB | 功能描述:LED 照明開發工具 ANA NCP1421 EVAL BRD RoHS:否 制造商:Fairchild Semiconductor 產品:Evaluation Kits 用于:FL7732 核心: 電源電壓:120V 系列: 封裝: |
| NCP1421LEDGEVB | 功能描述:EVAL BOARD FOR NCP1421 RoHS:是 類別:編程器，開發系統 >> 評估板 - LED 驅動器 系列:- 標準包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類型:1，非隔離 輸出電壓:17V 特點:可調光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關產品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
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