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MP2229 Folha de dados(PDF) 15 Page - Monolithic Power Systems

Nome de Peças MP2229
Descrição Electrónicos  High Efficiency 21V, 6A Synchronous Step-Down Converter with External Sync, Low-Power Mode, and External Soft-Start
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Fabricante Electrônico  MPS [Monolithic Power Systems]
Página de início  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2229 Folha de dados(HTML) 15 Page - Monolithic Power Systems

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MP2229 – 21V, 6A SYNCHRONOUS STEP-DOWN CONVERTER
MP2229 Rev. 1.0
www.MonolithicPower.com
15
2/12/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The external resistor divider sets the output
voltage (see “Typical Application” on page 1).
Choose R1 around 20kΩ, then R2 is:
OUT
R1
R2
V
1
0.6V
=
The T-type network is recommended highly
(see Figure 6).
FIGURE 6. T-Type Network
Table 1 lists the recommended T-type resistor
values for common output voltages.
TABLE1. Resistor Selection for Common Output
Voltages
(9)
VOUT (V)
R1 (kΩ)
R2 (kΩ)
RT (kΩ)
1.0
20
30
68
1.2
20
20
68
1.5
20
13.7
51
1.8
20
10
51
2.5
20
6.34
33
3.3
20
4.42
24
5
20
2.7
16
Notes:
9) The recommended parameters are based on a 500kHz
switching frequency. A different input voltage, output
inductors, and output capacitors may affect the recommended
values of R1, R2, and RT. For additional component
parameters, please refer to the “Typical Application Circuits”
on pages 19-21.
Selecting the Inductor
For most applications, use a 1µH to 10µH
inductor with a DC current rating at least 25%
percent higher than the maximum load current.
Select an inductor with a DC resistance less
than 15mΩ for best efficiency. Use the following
equation to derive the inductor value for most
designs:
OUT
IN
OUT
1
IN
L
OSC
V(V
V
)
L
VI
f
×−
=
×Δ ×
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
+
=
Under light-load conditions (below 100mA), use
a larger inductor for improved efficiency.
Setting the Switching Frequency
An external resistor (RFREQ) from FREQ/SYNC
to GND sets the MP2229 oscillating frequency.
The value of RFREQ can be calculated
approximately using the formula below:
FREQ
S
16000
R(k )
-2.3
f(kHz)
Ω=
Setting the LPM Voltage
The LPM voltage is used to set the transition
point from LPM to CCM. Choose a transition
point that provides the best combination of
efficiency, stability, ripple, and transient.
If the LPM voltage is set lower than the
recommended value (see Figure 8), then
stability and ripple improves but efficiency
during LPM mode and transient degrades.
Likewise, if the LPM voltage is set higher, then
the efficiency during LPM and transient
improves, but stability and ripple degrades.
Calculate the optimal balance point of the LPM
voltage for good efficiency, stability, and ripple.
The LPM voltage comes from the tap of a
resistor divider from VCC (5V) to GND (see
Figure 7.
FIGURE 7. LPM Network


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