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参数资料
| 型号： | MCP1603-330I/MC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.5 A SWITCHING REGULATOR, 2800 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 2 X 3 MM, 0.90 MM HEIGHT, PLASTIC, DFN-8 |
| 文件页数： | 7/26页 |
| 文件大小： | 758K |
| 代理商： | MCP1603-330I/MC |
2007 Microchip Technology Inc.
DS22042A-page 15
MCP1603
Table 5-1 contains the recommend range for the output
capacitor value.
5.6
Inductor Selection
When using the MCP1603, the inductance value can
range from 3.3 H to 10 H. An inductance value of
4.7 H is recommended to achieve a good balance
between converter load transient response and mini-
mized noise.
The value of inductance is selected to achieve a
desired amount of ripple current. It is reasonable to
assume a ripple current that is 20% of the maximum
load current. The larger the amount of ripple current
allowed, the larger the output capacitor value becomes
to meet ripple voltage specifications. The inductor
ripple current can be calculated according to the follow-
ing equation.
EQUATION 5-4:
When considering inductor ratings, the maximum DC
current rating of the inductor should be at least equal to
the maximum load current, plus one half the peak-to-
peak inductor ripple current (1/2 *
ΔIL). The inductor DC
resistance adds to the total converter power loss. An
inductor with a low DC resistance allows for higher
converter efficiency.
5.7
Thermal Calculations
The MCP1603 is available in two different packages
(TSOT-23 and 2x3 DFN). By calculating the power
dissipation and applying the package thermal
resistance, (
θJA), the junction temperature is
estimated.
The
maximum
continuous
junction
temperature rating for the MCP1603 is +125°C.
To quickly estimate the internal power dissipation for
the switching buck regulator, an empirical calculation
using measured efficiency can be used. Given the
measured efficiency, the internal power dissipation is
estimated by:
EQUATION 5-5:
The difference between the first term, input power
dissipation, and the second term, power delivered, is
the internal power dissipation. This is an estimate
assuming that most of the power lost is internal to the
MCP1603. There is some percentage of power lost in
the buck inductor, with very little loss in the input and
output capacitors.
TABLE 5-1:
CAPACITOR VALUE RANGE
CIN
COUT
Minimum
4.7 F
Maximum
—
22 F
ΔI
L
VOUT
FSW L
×
-------------------
1
VOUT
VIN
-------------
–
×
=
Where:
FSW = Switching Frequency
TABLE 5-2:
MCP1603 RECOMMENDED
INDUCTORS
Part
Number
Value
(H)
DCR
Ω
(max)
ISAT
(A)
Size
WxLxH (mm)
Coiltronics
SD3110
3.3
0.195
0.81
3.1x3.1x1.0
SD3110
4.7
0.285
0.68
3.1x3.1x1.0
SD3110
6.8
0.346
0.58
3.1x3.1x1.0
SD3812
3.3
0.159
1.40
3.8x3.8x1.2
SD3812
4.7
0.256
1.13
3.8x3.8x1.2
SD3812
6.8
0.299
0.95
3.8x3.8x1.2
Würth Elektronik
WE-TPC
Type XS
3.3
0.225
0.72
3.3x3.5x0.95
WE-TPC
Type XS
4.7
0.290
0.50
3.3x3.5x0.95
WE-TPC
Type S
4.7
0.105
0.90
3.8x3.8x1.65
WE-TPC
Type S
6.8
0.156
0.75
3.8x3.8x1.65
Sumida
CMD4D06
3.3
0.174
0.77
3.5x4.3x0.8
CMD4D06
4.7
0.216
0.75
3.5x4.3x0.8
CMD4D06
6.8
0.296
0.62
3.5x4.3x0.8
VOUT IOUT
×
Efficiency
-------------------------------
VOUT IOUT
×
()
–
PDiss
=
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