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参数资料
| 型号： | NCP1529MUTBGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP1529MUTBG |
| 设计资源： | NCP1529MUTBGEVB BOM NCP1529MUTBGEVB Gerber Files NCP1529MUTBGEVB Schematic |
| 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： | 0.9 V ~ 3.9 V |
| 电流 - 输出： | 1A |
| 输入电压： | 3.6V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1.7MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1529 |
| 其它名称： | NCP1529MUTBGEVBOS |
NCP1529
APPLICATION INFORMATION
Output Voltage Selection
In case of adjustable versions, the output voltage is
programmed through an external resistor divider connected
from V OUT to FB then to GND.
For low power consumption and noise immunity, the
resistor from FB to GND (R2) should be in the [100k ? 600k]
range. If R2 is 200 k given the V FB is 0.6 V, the current
through the divider will be 3.0 m A.
The formula below gives the value of V OUT , given the
desired R1 and the R1 value:
Input Capacitor Selection
In PWM operating mode, the input current is pulsating
with large switching noise. Using an input bypass capacitor
can reduce the peak current transients drawn from the input
supply source, thereby reducing switching noise
significantly. The capacitance needed for the input bypass
capacitor depends on the source impedance of the input
supply.
The maximum RMS current occurs at 50% duty cycle
with maximum output current, which is IO, max/2.
V out + V FB (1 ) R1 R2)
? V OUT : Output Voltage (V)
? V FB : Feedback Voltage = 0.6 V
? R1: Feedback Resistor from V OUT to FB
? R2: Feedback Resistor from FB to GND
Table 1. LIST OF INPUT CAPACITORS
(eq. 2)
For NCP1529, a low profile ceramic capacitor of 4.7 m F
should be used for most of the cases. For effective bypass
results, the input capacitor should be placed as close as
possible to the VIN Pin
Manufacturer
Part Number
Case Size
Value
DC Bias
Technology
( m F)
(V)
MURATA
MURATA
TDK
TDK
GRM15 series
GRM18 series
C1608 series
C1608 series
0402
0603
0603
0603
4.7
4.7
4.7
4.7
6.3
10
6.3
10
X5R
X5R
X5R
X5R
+ 34 kHz
f +
+
D I L + 1 *
D I L
I L(max) + I O(max) )
Output L ? C Filter Design Considerations
Th e NCP1529 operates at 1.7 MHz frequency and uses
current mode architecture. The correct selection of the
output filter ensures good stability and fast transient
response.
Due to the nature of the buck converter, the output L ? C
filter must be selected to work with internal compensation.
For NCP1529, the internal compensation is internally fixed
and it is optimized for an output filter of L = 2.2 m H and
C OUT = 10 m F.
The corner frequency is given by:
1 1
2 p L C OUT 2 p 2.2 m H 10 m F (eq. 3)
The device operates with inductance value of 2.2 m H. If
the corner frequency is moved, it is recommended to check
the loop stability depending of the accepted output ripple
voltage and the required output current. Take care to check
the loop stability. The phase margin is usually higher than
45 ° .
Table 2. L ? C FILTER EXAMPLE
Inductor Selection
The inductor parameters directly related to device
performances are saturation current and DC resistance and
inductance value. The inductor ripple current ( D I L )
decreases with higher inductance:
V OUT V OUT
(eq. 4)
L f SW V IN
? D I L : Peak to peak inductor ripple current
? L: Inductor value
? f SW : Switching frequency
The saturation current of the inductor should be rated
higher than the maximum load current plus half the ripple
current:
(eq. 5)
2
? I L(max) : Maximum inductor current
? I O(max) : Maximum Output current
The inductor ’s resistance will factor into the overall
efficiency of the converter. For best performances, the DC
resistance should be less than 0.3 W for good efficiency.
Inductance (L)
2.2 m H
4.7 m H
Output Capacitor (C OUT )
10 m F
4.7 m F
http://onsemi.com
12
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| NCP1530DM25R2 | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
| NCP1530DM25R2G | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
| NCP1530DM27R2 | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
| NCP1530DM27R2G | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
| NCP1530DM30R2 | 功能描述:直流/直流开关转换器 600mA PWM/PFM Buck 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 |
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