- 您现在的位置：买卖IC网 > PDF目录20432 > NCP3121QPBCKGEVB (ON Semiconductor)EVAL BOARD FOR NCP3121QPBCKG PDF资料下载
参数资料
| 型号： | NCP3121QPBCKGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/41页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP3121QPBCKG |
| 设计资源： | NCP3121 EVB BOM NCP3121QPBCKGEVB Gerber Files NCP3121QPBCKGEVB Schematic |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 3.3V，5V |
| 电流 - 输出： | 3A，3A |
| 输入电压： | 12V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP3121 |
| 其它名称： | NCP3121QPBCKGEVBOS |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页当前第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页
NCP3121
APPLICATION & DESIGN INFORMATION
I LP + I LOAD ) 1 D I L
V OUT V IN * V OUT
V IN @ D I L @ f OSC
I LP + I LOAD )
Inductor
The output inductor may be the most critical component
in the converter because it will directly affect the choice of
other components and dictate both the steady state and
transient performance of the converter. When choosing
inductors, one might have to consider maximum load
current, core and copper losses, component height, output
ripple, EMI, saturation and cost. Lower inductor values are
chosen to reduce the physical size of the inductor. A higher
value cuts down the ripple current and core losses and allows
more output current. In general, the output inductance value
should be as low and the output inductor physically as small
as possible to provide the best transient response and
minimum cost. If a large inductance value is used, the
converter will not respond quickly to rapid changes in the
load current. On the other hand, an inductance value that is
too low will result in very large ripple currents in the power
components, resulting in increased dissipation and lower
converter efficiency.
A good standard for determining the inductance to use is
to select the inductor peak ? to ? peak ripple current to be
approximately 25% of the maximum switch current. Also,
make sure that the inductor peak current is below the
maximum switch current limit and the selected inductor type
saturation current specification is higher than the peak
current through the switch.
The maximum current in the inductor while operating in
the continuous current mode is defined as the load current
plus one half of the D I L currrent:
2
The inductance value can be calculated by:
L +
Therefore, the inductor peak current, I LP , can be
calculated by:
V OUT V IN * V OUT
2 @ V IN @ L @ f OSC
where;
I LOAD is the output load current
V OUT is the output voltage
V IN is the input voltage
D I L is the peak ? to ? peak inductor ripple current
f OSC is the switching frequency of the oscillator
The choice of the appropriate inductor type depends not
only on the calculated inductance value, saturation current
rating and parasitic serial resistance, but also on the required
physical dimensions, EMI requirements (shielded or open
inductor) and the price. Examples of suitable inductors from
various manufacturers are shown in the table below.
Table 1. Calculated Inductor Values
Calculated coils, I ripple peak ? peak 20%
f [kHz]
200
350
500
750
I out [A]
12 V in to 7.5 V out
12 V in to 5 V out
12 V in to 3.3 V out
5 V in to 3.3 V out
5 V in to 2.5 V out
5 V in to 1.8 V out
2A
3A
2A
3A
2A
3A
2A
2A
2A
3A
36 m H
24 m H
36 m H
24 m H
30 m H
20 m H
14 m H
16 m H
15 m H
10 m H
20 m H
14 m H
20 m H
14 m H
17 m H
12 m H
8 m H
9 m H
8.2 m H
5.5 m H
14 m H
10 m H
15 m H
10 m H
12 m H
8 m H
5.6 m H
6.3 m H
5.8 m H
3.8 m H
10 m H
6.5 m H
10 m H
6.5 m H
8 m H
5.4 m H
3.7 m H
4 m H
3.8 m H
2.6 m H
http://onsemi.com
15
相关PDF资料 |
PDF描述 |
|---|---|
| AT45DB321C-RU | IC FLASH 32MBIT 40MHZ 28SOIC |
| MIC4429BM | IC DRIVER MOSFET 6A LS 8-SOIC |
| SB550-E3/51 | DIODE SCHOTTKY 5A 50V DO-201AD |
| NCP3120QPBCKGEVB | EVAL BOARD FOR NCP3120QPBCKG |
| VF30100S-E3/45 | DIODE SCHOTTKY 30A 100V ITO220AB |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP3122MNTXG | 功能描述:直流/直流开关调节器 Dual 2.0 Switching Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| NCP3122QPBCKGEVB | 功能描述:电源管理IC开发工具 NCP3122 2A HF BUCK DB 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 |
| NCP3123MNTXG | 功能描述:直流/直流开关调节器 Dual 3.0 A Switching Regulator RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| NCP3123MNTXG-CUT TAPE | 制造商:ON 功能描述:NCP3123 Series 13.2 V Dual 3 A Step-Down DC/DC Switching Regulator - QFN-32 |
| NCP3123QPBCKGEVB | 功能描述:电源管理IC开发工具 NCP3123 3A HF BUCK DB 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 |
发布紧急采购，3分钟左右您将得到回复。