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PDF MP1411 Data sheet ( Hoja de datos )
| Número de pieza | MP1411 | |
| Descripción | Step Down Converter | |
| Fabricantes | MPS | |
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www.DataSheet4U.com
TM
The Future of Analog IC Technology TM
DESCRIPTION
The MP1411 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 2A continuous output
current over a wide input supply range with
excellent load and line regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown. In
shutdown mode the regulator draws 23µA of
supply current. Programmable soft-start
minimizes the inrush supply current and the
output overshoot at initial startup.
The MP1411 requires a minimum number of
readily available standard external components.
MP1411
2A, 18V, 380KHz
Step-Down Converter
FEATURES
• 2A Output Current
• 0.2Ω Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 95% Efficiency
• 23µA Shutdown Mode
• Fixed 380KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 4.75V to 18V Operating Input Range
• Output Adjustable from 0.92V to 16V
• Programmable Under Voltage Lockout
• Available in an MSOP10 with Exposed Pad
Package
APPLICATIONS
• Distributed Power Systems
• Battery Charger
• DSL Modems
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V - 18V
OPEN = AUTOMATIC
STARTUP
C5
10nF
42
9 IN
EN
BS 5
SW
10 MP1411 7
SS FB
GND
COMP
68
C6
OPEN
C3
3.9nF
D1
B220A
VOUT
3.3V/2A
MP1411_TAC_S01
Efficiency vs
Output Current
95
90 5.0V
85 3.3V
80 2.5V
75
70
65
60
0
0.5 1.0 1.5 2.0
OUTPUT CURRENT (A)
2.5
MP1411_EC01
MP1411 Rev. 1.2
12/5/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
1
1 page  
TM
www.DataSheet4U.com
MP1411 – 2A, 18V, 380KHz STEP-DOWN CONVERTER
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The output voltage is set using a resistive voltage
divider from the output voltage to FB pin. The
voltage divider divides the output voltage down to
the feedback voltage by the ratio:
VFB
=
VOUT
R2
R1 + R2
Where VFB is the feedback voltage and VOUT is
the output voltage.
Thus the output voltage is:
VOUT
=
0.92
×
R1 + R2
R2
A typical value for R2 can be as high as 100kΩ,
but a typical value is 10kΩ. Using that value, R1
is determined by:
R1 = 10.87 × (VOUT − 0.92)
For example, for a 3.3V output voltage, R2 is
10kΩ, and R1 is 25.8kΩ.
Inductor
The inductor is required to supply constant
current to the output load while being driven by
the switched input voltage. A larger value inductor
will result in less ripple current that will result in
lower output ripple voltage. However, the larger
value inductor will have a larger physical size,
higher series resistance, and/or lower saturation
current. A good rule for determining the
inductance to use is to allow the peak-to-peak
ripple current in the inductor to be approximately
30% of the maximum switch current limit. Also,
make sure that the peak inductor current is below
the maximum switch current limit. The inductance
value can be calculated by:
L
=
VOUT
fS × ∆IL
× ⎜⎜⎝⎛1−
VOUT
VIN
⎟⎟⎠⎞
Where fS is the switching frequency, ∆IL is the
peak-to-peak inductor ripple current and VIN is
the input voltage.
Choose an inductor that will not saturate under
the maximum inductor peak current. The peak
inductor current can be calculated by:
ILP
= ILOAD
+
VOUT
2 × fS × L
× ⎜⎜⎝⎛1−
VOUT
VIN
⎟⎟⎠⎞
Where ILOAD is the load current.
Output Rectifier Diode
The output rectifier diode supplies the current to
the inductor when the high-side switch is off. To
reduce losses due to the diode forward voltage
and recovery times, use a Schottky diode.
Choose a diode whose maximum reverse
voltage rating is greater than the maximum
input voltage, and whose current rating is
greater than the maximum load current.
Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required
to supply the AC current to the step-down
converter while maintaining the DC input
voltage. Use low ESR capacitors for the best
performance. Ceramic capacitors are preferred,
but tantalum or low-ESR electrolytic capacitors
may also suffice.
Since the input capacitor absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated by:
ICIN = ILOAD ×
VOUT
VIN
×⎜⎜⎛1−
⎝
VOUT
VIN
⎟⎞
⎟
⎠
The worst-case condition occurs at VIN = 2VOUT,
where:
ICIN
=
ILOAD
2
For simplification, choose the input capacitor
whose RMS current rating greater than half of
the maximum load current.
MP1411 Rev. 1.2
12/5/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MP1411.PDF ] | |
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