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| 型号： | NCP3020ADR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 360kHz |
| 占空比： | 84% |
| 电源电压： | 4.7 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | NCP3020ADR2GOSDKR |
NCP3020A, NCP3020B, NCV3020A, NCV3020B
Boost Voltage
18
Voltage Ripple
16
14
12
10
8
6
4
2
0
Maximum Allowable Voltage
Maximum Boost Voltage
4.5
6.5
8.5
10.5
12.5
14.5 16.5 18.5
20.5
22.5
24.5
26.5
Input Voltage (V)
Figure 31. Boost Voltage at 80% Duty Cycle
Inductor Selection
When selecting the inductor, it is important to know the
input and output requirements. Some example conditions
are listed below to assist in the process.
Table 1. DESIGN PARAMETERS
Design Parameter Example Value
V OUT ) V LSD V OUT
D + [ D +
V IN * V HSD ) V LSD V IN
(eq. 5)
3.3 V
3 27.5% +
12 V
The ratio of ripple current to maximum output current
simplifies the equations used for inductor selection. The
Input Voltage
(V IN )
9 V to 18 V
formula for this is given in Equation 6.
Nominal Input Voltage
Output Voltage
(V IN )
(V OUT )
12 V
3.3 V
ra +
D I
I OUT
(eq. 6)
Input ripple voltage
Output ripple voltage
Output current rating
Operating frequency
(VIN RIPPLE )
(VOUT RIPPLE )
(I OUT )
(Fsw)
300 mV
50 mV
10 A
300 kHz
The designer should employ a rule of thumb where the
percentage of ripple current in the inductor lies between
10% and 40%. When using ceramic output capacitors the
ripple current can be greater thus a user might select a higher
ripple current, but when using electrolytic capacitors a lower
F +
1
V OUT
A 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 cycle (D). Duty cycle can also be calculated
using V OUT , V IN , the low side switch voltage drop V LSD ,
and the High side switch voltage drop V HSD .
(eq. 3)
T
ripple current will result in lower output ripple. Now,
acceptable values of inductance for a design can be
calculated using Equation 7.
L + @ (1 * D) 3 3.3 m H
I OUT @ ra @ F SW
(eq. 7)
3.3 V
+ @ (1 * 27.5%)
10 A @ 24% @ 300 kHz
The relationship between ra and L for this design example
is shown in Figure 32.
D +
T ON
T
( * D +
T OFF
T
(eq. 4)
http://onsemi.com
16
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相关代理商/技术参数 |
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| NCP3020BGEVB | 功能描述:电源管理IC开发工具 NCP3020A EVALUATION BOARD 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 |
| NCP302HSN09T1 | 功能描述:电压监测器/监控器 0.9V Detector RoHS:否 制造商:Texas Instruments 监测电压数:2 监测电压:Adjustable 输出类型:Open Drain 欠电压阈值: 过电压阈值: 准确性:1 % 工作电源电压:1.5 V to 6.5 V 工作电源电流:1.8 uA 最大工作温度:+ 125 C 封装 / 箱体:SON-6 安装风格:SMD/SMT |
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