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参数资料
| 型号： | NCP3125CRAGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 18/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION NCP3125 CERAMIC |
| 设计资源： | NCP3125 Schematic NCP3125CRAGEVB 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： | 4A |
| 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： | NCP3125 |
| 其它名称： | NCP3125CRAGEVBOS |
NCP3125
Assuming an output capacitance of 470 m F in parallel with
22 m F with a crossover frequency of 35 kHz, the
compensation values for common output voltages can be
calculated as shown in Table 6:
Table 6. COMPENSATION VALUES
V
900 mV
V in
(V)
12
12
12
12
12
12
12
5
5
5
5
5
V out
(V)
0.8
1.2
1.5
1.8
2.5
3.3
5.0
0.8
1.2
1.5
1.8
2.5
L out
( m F)
2.2
2.7
2.7
3.9
4.7
5.6
6.8
1.8
2.7
2.7
3.3
3.3
RF
(k W )
X
20
20
20
20
20
20
20
20
20
20
20
Cf
(nF)
X
1
1
1
1
1
1
1
1
1
1
1
Cc
(nF)
150
100
100
120
82
68
47
68
56
39
33
27
Rc
(k W )
0.243
0.412
0.487
0.806
1.07
1.4
1.96
0.453
0.953
1.15
1.5
1.82
Cp
(nF)
5.6
2.7
2.7
1.8
1.5
1.2
0.82
1
1
0.82
0.68
0.56
Vcomp
Vout
Figure 25. Soft ? Start Ramp
The delay from the charging of the compensation network
to the bottom of the ramp is considered t ssdelay . The total
delay time is the addition of the current set delay and t ssdelay ,
which in this case is 9 ms and 7.45 ms respectively, for a
total of 16.45 ms.
Calculating Input Inrush Current
The input inrush current has two distinct stages: input
charging and output charging. The input charging of a buck
stage is usually not controlled, and is limited only by the
input RC network, and the output impedance of the upstream
Calculating Soft ? Start Time
To calculate the soft ? start delay and soft ? start time, the
following equations can be used.
power stage. If the upstream power stage is a perfect voltage
source, then the input charge inrush current can be depicted
as shown in Figure 26 and calculated as:
t SSdelay +
C P ) C C
I SS
0.9 V
3
(eq. 45)
IPK
7.45 ms +
2.83 nF ) 80 nF
10 m A
0.9 V
I SS
CIN ESR
120 A +
C P = Compensation pole capacitor
C C = Compensation capacitor
I SS = Soft ? start current
The time the output voltage takes to increase from 0 V to
a regulated output voltage is t ss as shown in Equation 46:
C P ) C C D V ramp
t SS +
(eq. 46)
Figure 26. Input Charge Inrush Current
V IN
I ICinrush_PK 1 +
12
0.1
(eq. 47)
2.51 ms +
2.83 nF ) 80 nF
10 m A
27.5%
1.1 V
C P
C C
D
I SS
t SS
V ramp
= Compensation pole capacitor
= Compensation capacitor
= Duty ratio
= Soft ? start current
= Soft ? start interval
= Peak ? to ? peak voltage of the ramp
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP3126ADR2G | 功能描述:直流/直流开关转换器 3A PWM Switching Buck Regulator RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| NCP3126AGEVB | 功能描述:电源管理IC开发工具 NCP3126 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 |
| NCP3126CRAGEVB | 功能描述:电源管理IC开发工具 NCP3126 CERAMIC 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 |
| NCP3127ADR2G | 功能描述:直流/直流开关转换器 2A PWM Switching Buck Regulator RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| NCP3127AGEVB | 功能描述:电源管理IC开发工具 NCP3127 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 |
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