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| 型号： | NCP1523BFCT2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 8FLIPCHIP |
| 标准包装： | 3,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.9 V ~ 3.3 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFBGA，FCBGA |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-覆晶 |
NCP1523
APPLICATION INFORMATION
Output Voltage Selection
The output voltage is programmed through an external
resistor divider connected from ADJ to FB then to GND. For
low power consumption and noise immunity, the resistor
from FB to GND (R2) should be in the [100 k W ? 600 k W ]
range. If R2 is 200 k W given the V FB is 0.6 V, the current
through the divider will be 3 m A.
The formula below gives the value of V OUT , given the
desired R1 and the R1 value,
The device operates with inductance value between 1 m H
and maximum of 4.7 m H.
If the corner frequency is moved, it is recommended to
check the loop stability depending of the output ripple
voltage accepted and output current required. For lower
frequency, the stability will be increase; a larger output
capacitor value could be chosen without critical effect on the
system. On the other hand, a smaller capacitor value
increases the corner frequency and it should be critical for
1 ) R1
VOUT + VFB
R2
the system stability. Take care to check the loop stability.
The phase margin is usually higher than 45 ° .
?
?
?
?
V OUT : output voltage (volts)
V FB : feedback voltage = 0.6 V
R1: feedback resistor from V OUT to FB
R2: feedback resistor from FB to GND
Table 2. L?C FILTER EXAMPLE
Inductance (L) Output Capacitor (C OUT )
1 m H 10 m F
Input Capacitor Selection
In PWM operating mode, the input current is pulsating
with large switching noise. Using an input bypass capacitor
2.2 m H
4.7 m H
4.7 m F
2.2 m F
1? OUT
D IL +
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.
For NCP1523, 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 V IN Pin.
Table 1. LIST OF INPUT CAPACITOR
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:
VOUT V
L fSW VIN
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
Murata
GRM188R60J475KE
GRM21BR71C475KA
current:
IL(MAX) + IO(MAX) )
D IL
2
Taiyo Yuden
TDK
JMK212BY475MG
C2012X5R0J475KT
C1608X5R0J475KT
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
Output L?C Filter Design Considerations:
The NCP1523 is built in 3 MHz frequency and uses
voltage mode architecture. The correct selection of the
output filter ensures good stability and fast transient
resistance should be less than 0.3 W for good efficiency.
Table 3. LIST OF INDUCTOR
response.
Due to the nature of the buck converter, the output L?C
filter must be selected to work with internal compensation.
For NCP1523, the internal compensation is internally fixed
and it is optimized for an output filter of L = 2.2 m H and
C OUT = 4.7 m F
The corner frequency is given by:
FDK
TDK
Taiyo Yuden
Coil Craft
MIPW3226 Series
VLF3010AT Series
TFC252005 Series
LQ CBL2012
DO1605?T Series
LPO3010
fc +
2 p L
1
COUT
+
1
2 p 2.2 m H
4.7 m F
+ 49.5 KHz
http://onsemi.com
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