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参数资料
| 型号： | NCP3101BUCK2GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/26页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP3101BUCK2G |
| 设计资源： | NCP3101BUCK2 EVB BOM NCP3101BUCK2GEVB Gerber Files |
| 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： | 1.5V |
| 电流 - 输出： | 6A |
| 输入电压： | 5V |
| 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： | NCP3101 |
| 其它名称： | NCP3101BUCK2GEVBOS |
NCP3101C
APPLICATION SECTION
ra +
I OUT
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
NCP3101C product page. The tool allows you to capture
your design point and optimize the performance of your
regulator based on your design criteria.
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 small ,
thus a user might select a higher ripple current . However,
when using electrolytic capacitors , a lower ripple current
will result in lower output ripple due to the higher ESR of
electrolytic capacitors. The ratio of ripple current to
maximum output current is given in Equation 5.
D I
(eq. 5)
Table 4. DESIGN PARAMETERS
Design Parameter
Input voltage (VCC)
Output voltage (V OUT )
Input ripple voltage (VCC RIPPLE )
Example Value
10.8 V to 13.2 V
3.3 V
300 mV
D I = Ripple current
I OUT = Output current
ra = Ripple current ratio
Using the ripple current rule of thumb, the user can establish
acceptable values of inductance for a design using
Equation 6.
V OUT
Output ripple voltage (V OUTRIPPLE ) 40 mV
Output current rating (I OUT ) 6A
Operating frequency (F SW ) 275 kHz
The buck converter produces input voltage V CC 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 V OUT , V CC , Low Side Switch Voltage
Drop V LSD , and High Side Switch Voltage Drop V HSD .
L OUT +
5.6 m H +
D
F SW
I OUT
L OUT
ra
* (1 * D ) 3
I OUT * ra * F SW
12 V
* (1 * 27.5%)
6.0 A * 26% * 275 kHz
= Duty ratio
= Switching frequency
= Output current
= Output inductance
= Ripple current ratio
(eq. 6)
F SW +
1
T
(eq. 2)
15
13
D +
T ON
T
(1 * D ) +
T OFF
T
(eq. 3)
11
D +
27.5% +
V OUT ) V LSD
V CC * V HSD ) V LSD
3.3 V
12 V
[ D +
V OUT
V CC
3
(eq. 4)
9
7
5
3
13V
7V
5V
5.6 m H
10
13
16
19
22
25
28
31
34
37
40
D
F SW
T
T OFF
T ON
V HSD
VCC
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
1
RIPPLE CURRENT RATIO (%)
Figure 26. Inductance vs. Current Ripple Ratio
When selecting an inductor, the designer must not exceed
the current rating of the part. To keep within the bounds of
the part’s maximum rating, a calculation of the RMS current
and peak current are required.
Inductor Selection
When selecting an inductor, the designer may employ a
rule of thumb for the design where the percentage of ripple
http://onsemi.com
12
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| NCP3101CMNTXG | 功能描述:直流/直流开关调节器 INTEGRATED SWITCHER 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 |
| NCP3101MNTXG | 功能描述:直流/直流开关调节器 6A SYNC BUCK CNVERTR 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 |
| NCP3102BMNTXG | 功能描述:直流/直流开关调节器 10A SYNC BUCK CNVRTR 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 |
| NCP3102BUCK1GEVB | 功能描述:电源管理IC开发工具 NCP3102 DEMO BD 100X110M 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 |
| NCP3102BUCK2GEVB | 功能描述:电源管理IC开发工具 NCP3102 DEMO BD 55X25MM 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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