参数资料
| 型号： | NCP1421DMR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC ADJ 0.6A 8MICRO |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.5 V ~ 5 V |
| 输入电压： | 1 V ~ 5 V |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 剪切带 (CT) |
| 供应商设备封装： | Micro8? |
| 其它名称： | NCP1421DMR2OSCT |
NCP1421
From the previous calculations, you need at least 18.75
m 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 m F is selected. The NCP1421 is internally compensated
for most applications, but in case additional compensation
16
14
12
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.
21
18
15
10
12
8
6
4
I OUT = 500 mA
9
6
2
3
I OUT = 500 mA
0
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
0
1.6
1.9
2.2
2.5
2.8
3.1
3.4
3.7
4.0
INPUT VOLTAGE (V)
Figure 27. Suggested Inductance of V OUT = 3.3 V
40
INPUT VOLTAGE (V)
Figure 28. Suggested Inductance of V OUT = 5.0 V
25
35
30
25
20
15
V OUT?RIPPLE = 40 mV
V OUT?RIPPLE = 45 mV
33
50
10
5
0
V OUT?RIPPLE = 50 mV
100
200
250
300
350
400
450
500
550
600
OUTPUT CURRENT (mA)
Figure 29. Suggested Capacitance for Output Capacitor
Table 1. Suggestions for Passive Components
Output Current
500 mA
250 mA
Inductors
Sumida CR43, CR54,CDRH6D28 series
Sumida CR32 series
Capacitors
Panasonic ECJ series
Kemet TL494 series
Panasonic ECJ series
Kemet TL494 series
http://onsemi.com
12
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| NCP1421DMR2G | 功能描述:DC/DC 开关控制器 600mA PFM Boost w/Ring Killer 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 |
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| NCP1422EVB | 功能描述:电源管理IC开发工具 ANA NCP1422 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 |
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