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參數(shù)資料
| 型號(hào)： | LM4510SDX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Synchronous Step-Up DC/DC Converter with True Shutdown Isolation |
| 中文描述： | 1.8 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, DSO10 |
| 封裝： | 3 X 3 MM, 0.80 MM HEIGHT, LLP-10 |
| 文件頁數(shù)： | 12/18頁 |
| 文件大小： | 2362K |
| 代理商： | LM4510SDX |
TABLE 1. Suggested Component Values for Different Output Voltages
Output Voltage (V)
R
F2
(k
20.5
20.5
20.5
20.5
)
R
F1
(k
240
174
60.4
33
)
R
C
(k
46.4
46.4
46.4
46.4
)
C
C1
(nF)
2.2
2.2
2.2
2.2
16
12
5
3.3
MAXIMUM OUTPUT CURRENT
When the output voltage is set at different level, it is important
to know the maximum load capability. By first order estima-
tion, I
OUT(MAX)
can be estimated by the following equation:
INDUCTOR SELECTION
The larger value inductor makes lower peak inductor current
and reduces stress on internal power NMOS.
On the other hand, the smaller value inductor has smaller
outline, lower DCR and a higher current capacity. Generally
a 4.7
μ
H to 15
μ
H inductor is recommended.
I
L_AVE
CHECK
The average inductor current is given by the following equa-
tion:
Where I
is output current,
η
is the converter efficiency of
the total driven load and D’ is the off duty cycle of the switching
regulator.
Inductor DC current rating (40°C temperature rise) should be
more than the average inductor current at worst case.
Δ
I Define
The inductor ripple current is given by the following equations:
Where D is the on-duty cycle of the switching regulator. A
common choice is to set
Δ
I
L
to about 30% of I
L_AVE
.
I
L_PK
≤
I
CL
Check & I
MIN
Define
The peak inductor current is given by the following equation:
To prevent loss of regulation, ensure that the NMOS power
switch current limit is greater than the worst-case peak in-
ductor current in the target application.
Also make sure that the inductor saturation current is greater
than the peak inductor current under the worst-case load
transient, high ambient temperature and startup conditions.
Refer to Table 2 for suggested inductors.
TABLE 2. Suggested Inductors and Their Suppliers
Model
Vendor
COILCRAFT
Dimensions LxWxH (mm)
3.3mm x 3.3mm x 1.4mm
D.C.R (max)
320 m
18 m
DO3314-472ML
DO3316P-472ML
COILCRAFT
12.95mm x 9.4mm x 5.4mm
INPUT CAPACITOR SELECTION
Due to the presence of an inductor, the input current wave-
form is continuous and triangular. So the input capacitor is
less critical than output capacitor in boost applications. Typi-
cally, a 4.7
μ
F to 10
μ
F ceramic input capacitor is recom-
mended on the VIN pin of the IC.
I
CIN_RMS
Check
The RMS current in the input capacitor is given by the follow-
ing equation:
The input capacitor should be capable of handling the RMS
current.
OUTPUT CAPACITOR SELECTION
The output capacitor in a boost converter provides all the out-
put current when the switch is closed and the inductor is
charging. As a result, it sees very large ripple currents.
A ceramic capacitor of value 4.7
μ
F to 10
μ
F is recommended
at the output. If larger amounts of capacitance are desired for
improved line support and transient response, tantalum ca-
pacitors can be used.
I
COUT_RMS
Check
The RMS current in the output capacitor is given by the fol-
lowing equation:
www.national.com
12
L
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