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MP1497S Scheda tecnica(PDF) 11 Page - Monolithic Power Systems

Il numero della parte MP1497S
Spiegazioni elettronici  High-Efficiency, 3A, 16V, 500kHz Synchronous, Step-Down Converter
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Produttore elettronici  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP1497S Scheda tecnica(HTML) 11 Page - Monolithic Power Systems

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MP1497S – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MP1497S Rev. 1.01
www.MonolithicPower.com
11
9/7/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 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 sets the feedback
loop bandwidth. R2 is then given by:
OUT
R1
R2
V
1
0.807V
The T-type network shown in Figure 4 is highly
recommended.
FB
8
RT
R2
R1
VOUT
Figure 4: T-Type Network
Table 1 lists the recommended T-type resistors
value for common output voltages.
Table 1: Resistor Values for Common Output
Voltages
VOUT (V)
R1 (kΩ)
R2 (kΩ)
Rt (kΩ)
1.0
20.5
82
82
1.2
30.1
60.4
82
1.8
40.2
32.4
56
2.5
40.2
19.1
33
3.3
40.2
13
33
5
40.2
7.68
33
Selecting the Inductor
Use a 1µH-to-10µH inductor with a DC current
rating of at least 25% percent higher than the
maximum load current for most applications.
For highest efficiency, select an inductor with a
DC resistance less than 15mΩ. For most
designs, calculate the inductance value with:
OUT
IN
OUT
1
IN
L
OSC
V(V
V
)
L
VI
f

 
Where ΔIL is the inductor ripple current.
Choose an 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
Use a larger inductance for improved light-load
efficiency.
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, therefore requires a capacitor
supply the AC current to the step-down
converter while maintaining the DC input
voltage. Use low-ESR capacitors for the best
performance, such as ceramic capacitors with
X5R or X7R dielectrics that have low ESR and
small
temperature
coefficients.
For
most
applications, use a 22µF capacitor.
The input capacitor (C1) requires an adequate
ripple current rating because it absorbs the
input switching current. Estimate the RMS
current in the input capacitor as:
IN
OUT
IN
OUT
LOAD
1
C
V
V
1
V
V
I
I
The worst-case condition occurs at VIN=2VOUT,
where:
2
I
I
LOAD
1
C
For simplification, choose the 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,
include
a
small,
high-quality,
ceramic capacitor—e.g. 0.1μF—as close to the
IC as possible. When using ceramic capacitors,
make sure that they have enough capacitance
to prevent excessive input voltage ripple.
Estimate the input voltage ripple caused by the
capacitance as:
LOAD
OUT
OUT
IN
IN
SIN
IV
V
V1
fC1
V
V


 


Selecting the Output Capacitor
The output capacitor (C2) maintains the DC
output voltage. Use ceramic, tantalum, or low-
ESR
electrolytic
capacitors.
Low
ESR
capacitors are preferred to keep the output


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