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MP2225 数据表(PDF) 14 Page - Monolithic Power Systems

部件名 MP2225
功能描述  High-Efficiency, 5A, 18V, 500kHz Synchronous, Step-Down Converter
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制造商  MPS [Monolithic Power Systems]
网页  http://www.monolithicpower.com
标志 MPS - Monolithic Power Systems

MP2225 数据表(HTML) 14 Page - Monolithic Power Systems

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MP2225 –18V/5A SYNCHRONOUS STEP-DOWN CONVERTER
MP2225 Rev. 1.01
www.MonolithicPower.com
14
4/13/2016
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider sets the output
voltage (see Typical Application on page 1).
The feedback resistor R1 also sets the
feedback loop bandwidth with the internal
compensation capacitor. First, choose a value
for R1, R2 is then given by:
OUT
R1
R2
V
1
0.6V
=
(1)
The feedback network—as shown in Figure 5—
is highly recommended.
Figure 5: Feedback Network
Table 1 lists the recommended resistors and
capacitors value for common output voltages.
Table 1: Component Selection for Common
Output Voltages
(9)
VOUT (V) R1 (kΩ)
R2 (kΩ)
1.0
120
180
1.2
120
120
1.35
100
80.6
1.5
80.6
53.6
1.8
80.6
40.2
2.5
80.6
25.5
3.3
40.2
8.87
5
40.2
5.49
9) The recommended parameters are based on 500kHz
switching frequency, different output inductors and capacitors
affect the recommended values of R1 and R2. For the other
components’
parameters,
please
refer
to
TYPICAL
APPLICATION CIRCUITS on 17-19.
Selecting the Inductor
Use a 1µH-to-10µH inductor with a DC current
rating at least 25% percent higher than the
maximum load current for most applications.
For highest efficiency, use an inductor with a
DC resistance less than 15mΩ. For most
designs, the inductance value can be derived
from the following equation.
OUT
IN
OUT
1
IN
L
OSC
V(V
V
)
L
VI
f
×
=
×Δ ×
(2)
Where ΔIL is the inductor ripple current.
Choose the inductor ripple current to be
approximately 30% of the maximum load
current. The maximum inductor peak current is:
2
I
I
I
L
LOAD
)
MAX
(
L
Δ
+
=
(3)
Use a larger inductor for improved efficiency
under light-load conditions—below 100mA.
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, therefore requires a capacitor to
supply the AC current to the step-down
converter while maintaining the DC input
voltage. Use low ESR capacitors for the best
performance. Use ceramic capacitors with X5R
or X7R dielectrics for best results because of
their
low
ESR
and
small
temperature
coefficients. For most applications, use a 22µF
capacitor.
Since C1 absorbs the input switching current, it
requires an adequate ripple current rating. The
RMS current in the input capacitor can be
estimated by:
×
×
=
IN
OUT
IN
OUT
LOAD
1
C
V
V
1
V
V
I
I
(4)
The worse case condition occurs at VIN = 2VOUT,
where:
2
I
I
LOAD
1
C =
(5)
For simplification, choose an input capacitor
with an RMS current rating greater than half of
the maximum load current.
The input capacitor can be electrolytic, tantalum
or ceramic. When using electrolytic or tantalum
capacitors, add a small, high quality ceramic
capacitor (e.g. 0.1μF) placed as close to the IC


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