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参数资料
| 型号： | NCP3127CRAGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION NCP3127 CERAMIC |
| 设计资源： | NCP3127 Schematic NCP3127 BOM |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 最低可调至 0.8V |
| 电流 - 输出： | 2A |
| 输入电压： | 4.5 ~ 13.2 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 350kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP3127 |
| 其它名称： | NCP3127CRAGEVBOS |
NCP3127
Current
VOCTH
BG
Flow
BG
Drive
Low Side
MOSFET
Current
PHASE
0V
VOCTH
Figure 20. Current Limit Trip
APPLICATION SECTION
and (1 * D) + OFF
T ON T
D + (eq. 3)
[ D + OUT 3 27.5% +
V OUT ) V LSD V 3.3 V
V IN * V HSD ) V LSD
V IN
D +
Design Procedure
When starting the design of a buck regulator, it is
important to collect as much information as possible about
the behavior of the input and output before starting the
design.
ON Semiconductor has a Microsoft Excel ? based design
tool available online under the design tools section of the
NCP3127 product page. The tool allows you to capture your
design point and optimize the performance of your regulator
based on your design criteria.
V OUT , V IN , the Low Side Switch Voltage Drop V LSD , and
the High Side Switch Voltage Drop V HSD .
1
F SW + T (eq. 2)
T T
12 V
(eq. 4)
Table 4. DESIGN PARAMETERS
Design Parameter
Input voltage (V IN )
Output voltage (V OUT )
Input ripple voltage (V INRIPPLE )
Output ripple voltage (V OUTRIPPLE )
Output current rating (I OUT )
Example Value
10.8 V to 13.2 V
3.3 V
300 mV
40 mV
2A
D
F SW
T
T OFF
T ON
V HSD
V IN
V LSD
V OUT
= Duty cycle
= Switching frequency
= Switching period
= High side switch off time
= High side switch on time
= High side switch voltage drop
= Input voltage
= Low side switch voltage drop
= Output voltage
Operating frequency
(F SW )
350 kHz
Inductor Selection
The buck converter produces input voltage V IN pulses that
are LC filtered to produce a lower DC output voltage V OUT .
The output voltage can be changed by modifying the on time
relative to the switching period T or switching frequency.
The ratio of high side switch on time to the switching period
is called duty ratio D. Duty ratio can also be calculated using
When selecting an inductor, the designer can employ a
rule of thumb for the design where the percentage of ripple
current in the inductor should be between 10% and 40%.
When using ceramic output capacitors, the ripple current can
be greater because the ESR of the output capacitor is smaller,
thus a user might select a higher ripple current. However,
http://onsemi.com
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| NCP3155ADR2G | 功能描述:直流/直流开关调节器 BUCK CONTROLLER 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 |
| NCP3155AGEVB | 功能描述:电源管理IC开发工具 BUCK CONTROLLER EVB 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 |
| NCP3155BDR2G | 功能描述:直流/直流开关调节器 3 A SYNCHRONOUS BUCK 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 |
| NCP3155BGEVB | 功能描述:电源管理IC开发工具 3 A SYNCHRONOUS BUCK 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 |
| NCP3163_Boost_EVB | 制造商:ON Semiconductor 功能描述:3.4 A, Step-Up/Down/Inverting Switching Regulator 制造商:ON Semiconductor 功能描述:3.4A,24V,Step-Up Switching Regulator |
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