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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： | 11/17頁 |
| 文件大小： | 166K |
| 代理商： | NCP1521AMUTBG |
NCP1521
http://onsemi.com
11
Table 3. List of Inductor
FDK
MIPW3226 Series
TDK
VLF3010AT Series
Taiyo Yuden
LQ CBL2012
Coil craft
DO1605T Series
LPO3010
Output Capacitor Selection
Selecting the proper output capacitor is based on the
desired output ripple voltage. Ceramic capacitors with low
ESR values will have the lowest output ripple voltage and
are strongly recommended. The output capacitor requires
either an X7R or X5R dielectric.
The output ripple voltage in PWM mode is given by:
VOUT
IL
1
4
fSW3
COUT
ESR
(eq. 6)
In PFM mode (at light load), the output voltage is
regulated by pulse frequency modulation. The output
voltage ripple is independent of the output capacitor value.
It is set by the threshold of PFM comparator.
Table 4. List of Output Capacitor
Murata
GRM188R60J475KE
4.7 F
GRM21BR60J106ME19L
10 F
GRM188R60OJ106ME
10 F
Taiyo Yuden
JMK212BY475MG
4.7 F
JMK212BJ106MG
10 F
TDK
C2012X5ROJ475KB
4.7 F
C2012X5ROJ226M
22 F
C2012X5ROJ106K
10 F
FeedForward Capacitor Selection
The feedforward capacitor sets the feedback loop
response and is critical to obtain good loop stability.
Given that the compensation is internally fixed, a fixed
18 pF or higher ceramic capacitor is needed. Choose a
small ceramic capacitor X7R or X5R or COG dielectric.
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