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參數資料
| 型號： | NCP1521AMUTBG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.5 MHz, 600 mA, High−Efficiency, Low Quiescent Current, Adjustable Output Voltage Step−Down Converter |
| 中文描述： | 0.6 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, 0.65 MM PITCH, LEAD FREE, UDFN-6 |
| 文件頁數： | 12/17頁 |
| 文件大小： | 166K |
| 代理商： | NCP1521AMUTBG |
NCP1521
http://onsemi.com
12
APPLICATION BOARD
PCB Layout Recommendations
Good PCB layout plays an important role in switching
mode power conversion. Careful PCB layout can help to
minimize ground bounce, EMI noise and unwanted
feedback that can affect the performance of the converter.
Hints suggested below can be used as a guideline in most
situations.
1. Use starground connection to connect the IC
ground nodes and capacitor GND nodes together
at one point. Keep them as close as possible, and
then connect this to the ground plane through
several vias. This will reduce noise in the ground
plane by preventing the switching currents from
flowing through the ground plane.
2. Place the power components (i.e., input capacitor,
inductor and output capacitor) as close together
as possible for best performance. All connecting
traces must be short, direct, and wide to reduce
voltage errors caused by resistive losses through
the traces.
3. Separate the feedback path of the output voltage
from the power path. Keep this path close to the
NCP1521 circuit. And also route it away from
noisy components. This will prevent noise from
coupling into the voltage feedback trace.
4. Place the DCDC converter away from noise
sensitive circuitry, such as RF circuits.
The following shows the NCP1521 demo board
schematic, layout, and bill of materials:
GND
2
VIN
1
EN
3
LX
5
FB
4
OFF ON
VIN
CIN
COUT
R1
R2
Cff
L
VOUT
Figure 27. NCP1521 Board Schematic
Figure 28. NCP1521 Board Layout
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| NCP1521ASNT1G | 功能描述:直流/直流開關轉換器 ANA LED DRIVER RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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| NCP1521BMUTBG | 功能描述:直流/直流開關轉換器 STEP DWN DCDC CNVRTR 1.5MHz 600mA RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| NCP1521BSNT1G | 功能描述:直流/直流開關轉換器 STEP DWN DCDC CNVRTR 1.5MHz 600mA RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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