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| 型号： | ADM00427 |
| 厂商： | Microchip Technology |
| 文件页数： | 20/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION MCP16323 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3V |
| 电流 - 输出： | 3A |
| 输入电压： | 6 ~ 18 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP16323 |
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MCP16323
TABLE 5-1:
CAPACITOR VALUE RANGE
5.0.7
BOOST CAPACITOR
Parameter
C OUT
Min
33 μF
Max
None
The boost capacitor is used to supply current for the
internal high-side drive circuitry that is above the input
voltage. The boost capacitor must store enough energy
5.0.6 INDUCTOR SELECTION
The MCP16323 is designed to be used with small
surface mount inductors. Several specifications should
be considered prior to selecting an inductor. To
optimize system performance, low ESR inductors
to completely drive the high-side switch on and off. A
22 nF X5R or X7R capacitor is recommended for all
applications. The boost capacitor maximum voltage is
5.5V, so a 6.3V or 10V rated capacitor is
recommended.
should be used.
5.0.8
THERMAL CALCULATIONS
Δ I L = ----- L - × t ON
EQUATION 5-3: INDUCTOR CURRENT
RIPPLE
V
L
The MCP16323 is available in a 3x3 QFN-16 package.
By calculating the power dissipation and applying the
package thermal resistance ( θ JA ), the junction
temperature is estimated. The maximum continuous
junction temperature rating for the MCP16323 is
+125°C.
To quickly estimate the internal power dissipation for
EXAMPLE 5-3:
MCP16323 PEAK
INDUCTOR CURRENT – 3A
the switching step-down regulator, an empirical
calculation using measured efficiency can be used.
Given the measured efficiency, the internal power
P DIS = ------------------------------- – ( V OUT × I OUT )
V IN = 12V
V OUT = 3.3V
I OUT = 3A
L = 4.7 μH
Δ IL
2
I LPK = --------- + IOUT
Inductor ripple current = 509 mA
Inductor peak current = 3.255A
An inductor saturation rating minimum of 3.255A is
recommended. A trade-off between size, cost and
efficiency is made to achieve the desired results.
dissipation is estimated in Equation 5-4 . This power
dissipation includes all internal and external
component losses. For a quick internal estimate,
subtract the estimated inductor ESR loss from the P DIS
EQUATION 5-4: TOTAL POWER
DISSIPATION ESTIMATE
V OUT × I OUT
Efficency
The difference between the first term, input power, and
the second term, power delivered, is the total system
power dissipation. The inductor losses are estimated
by P L = I OUT2 x L ESR .
TABLE 5-2:
MCP16323 RECOMMENDED
INDUCTORS
EXAMPLE 5-4:
POWER DISSIPATION
Part Number
Coilcraft ?
Value
(μH)
DCR
( Ω )
I SAT
(A)
Size
WxLxH
(mm)
V IN =
V OUT =
I OUT =
Efficiency =
12V
5.0V
3A
88%
MSS6132-472
4.7
0.056
2.84
6.1x6.1x3.2
Total System Dissipation
=
2.05 W
LPS6225-472
MSS7341-502
DO1813H-472
4.7
4.7
4.7
0.065
0.024
0.054
3.2
3.16
2.6
6.2x6.2x2.5
7.3x7.3x4.1
8.89x6.1x5.0
L ESR = 0.02 Ω
P L = 180 mW
MCP16323 internal power dissipation estimate:
Wurth Elektronik ?
7447785004 4.7
7447786004 4.7
0.06
0.057
2.5
2.8
5.9x6.2x3.3
5.9x6.2x5.1
P DIS – P L =
θ JA =
Estimated Junction =
1.87 W
38.5°C/W
+71.995°C
EPCOS
7447789004
?
B82464G2
B82464A2
4.7
4.7
4.7
0.033
0.033
0.03
3.9
3.1
4.5
7.3x3.2x1.5
10.4x10.4x3.0
10.4x10.4x3.0
Note
1:
2:
θ JA = 38.5°C/W for a 4-layer FR4 Printed Circuit
Board with a 13.5 in 2 , 1 oz internal copper ground
plane.
A smaller ground plane will result in a larger θ JA
temperature rise.
DS22284A-page 20
? 2011 Microchip Technology Inc.
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