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| 型号： | NCP1522BSNT1G |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 5TSOP |
| 标准包装： | 1 |
| 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： | 6-TSOP（0.059"，1.50mm 宽）5 引线 |
| 包装： | 标准包装 |
| 供应商设备封装： | 5-TSOP |
| 其它名称： | NCP1522BSNT1GOSDKR |
NCP1522B
APPLICATION INFORMATION
fc +
+
Output Voltage Selection
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
The corner frequency is given by:
1 1
2 p L COUT 2 p 2.2 m H
4.7 m F
+ 49 kHz
(eq. 3)
resistor from FB to GND (R2) should be in the
[100 k ? 600 k] 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:
The device is intended to operate with inductance value
of 2.2 m H.
If the corner frequency is moved, it is recommended to
check the loop stability depending on the accepted output
ripple voltage and the required output curret. Take care to
VOUT + VFB (1 ) R1 )
?
?
?
?
R2
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
(eq. 2)
check the loop stability. The phase margin is usually higher
than 45 ° .
Table 2. L ? C Filter Example
Inductance (L) Output Capacitor (C OUT )
1.0 m H 10 m F
Input Capacitor Selection
In PWM operating mode, the input current is pulsating
2.2
m H
4.7
m F
1 ? OUT
VOUT V
D IL +
with a 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 I out_max /2.
For NCP1522B, 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.
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:
(eq. 4)
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
IL(MAX) + IO(MAX) )
Table 1. List of Input Capacitors
GRM188R60J475KE
Murata
GRM21BR71C475KA
Taiyo Yuden JMK212BY475MG
C2012X5ROJ475KB
TDK
C1632X5ROJ475KT
Output L ? C Filter Design Considerations
4.7 m F
4.7 m F
4.7 m F
current:
D IL (eq. 5)
2
? D I L(MAX): Maximum Inductor Current
? D I O(MAX): Maximum Output Current
The inductor ’s resistance will factor into the overall
efficiency of the converter. For best performance, the DC
resistance should be less than 0.3 W for good efficiency.
The NCP1522B operates at 3 MHz frequency and uses
voltage 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 NCP1522B, 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.
Table 3. LIST OFINDUCTORS
Coilcraft
FDK
TDK
Taiyo Yuden
DO1605 ? T Series
LPO3010 Series
MIPW3226 Series
VLF3010AT Series
LQ CBL2012 Series
http://onsemi.com
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