DataSheet.es WD3133 Hoja de datos PDF


PDF WD3133 Datasheet ( Hoja de datos )

Número de pieza WD3133
Descripción 1.2-MHz DC-DC STEP-UP CONVERTERS
Fabricantes WillSEMI 
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WD3133 datasheet

1 Page

WD3133 pdf
Typical Characteristics
(Ta=25oC, VIN=3.6V, VEN=VIN, CIN=10μF, COUT=10μF, L=10μH, unless otherwise noted)
100 100
WD3133
90 90
80 80
70
60
50
0
L=22uH,V =9V
OUT
VIN=3.0V
V =3.6V
IN
VIN=4.2V
V =5.0V
IN
20 40 60 80 100 120
Output Current(mA)
70
60
50
0
L=10uH,V =9V
OUT
V =3.0V
IN
V =3.6V
IN
V =4.2V
IN
V =5.0V
IN
20 40 60 80 100 120
Output Current(mA)
Efficiency vs. Output Current
Efficiency vs. Output Current
100
90
80
70
60
50
0
L=22uH,V =12V
OUT
VIN=3.0V
V =3.6V
IN
VIN=4.2V
V =5.0V
IN
20 40 60 80 100 120
Output Current(mA)
Efficiency vs. Output Current
100
90
80
70
60
50
0
L=22uH,V =15V
OUT
VIN=3.0V
V =3.6V
IN
V =4.2V
IN
VIN=5.0V
20 40 60 80 100 120
Output Current(mA)
Efficiency vs. Output Current
100
90
80
70
60
50
0
L=10uH,VOUT=12V
V =3.0V
IN
VIN=3.6V
V =4.2V
IN
V =5.0V
IN
20 40 60 80 100 120
Output Current(mA)
Efficiency vs. Output Current
100
90
80
70
60
50
0
L=10uH,V =15V
OUT
VIN=3.0V
V =3.6V
IN
VIN=4.2V
V =5.0V
IN
20 40 60 80 100 120
Output Current(mA)
Efficiency vs. Output Current
Will Semiconductor Ltd.
5 Aug, 2016 - Rev. 1.2

5 Page

WD3133 arduino
Application Information
External component selection for the application
circuit depends on the load current requirements.
Certain tradeoffs between different performance
parameters can also be made.
Boost Inductor Selection
A 4.7μH to 22μH inductor with low DCR and high
saturation current is recommended. The minimum
and maximum inductor values are constrained by
many considerations. The minimum inductance is
limited by the peak inductor-current value. The
ripple current in the inductor is inversely proportional
to the inductance value, so the output voltage may
fall out of regulation if the peak inductor current
exceeds the current-limit value (1A minimum). Using
a nominal 10uH inductor allows full recommended
current operation even if the inductance is 20% low
due to component variation. However, for VOUT>30V
applications, a 4.7μH inductor is recommended.
The saturation current of inductor should be higher
enough than the peak switch current. And the
inductor should have low core losses at 1.2MHz and
low DCR (copper wire resistance).
Input Capacitor Selection
Connect the input capacitance from VDD to the
reference ground plane. Input capacitance reduces
the ac voltage ripple on the input rail by providing a
low-impedance path for the switching current of the
boost converter. The WD3133 does not have a
minimum or maximum input capacitance require-
ment for operation, but a 4.7μF~10μF, X7R or X5R
ceramic capacitor is recommended for most
applications for reasonable input-voltage ripple
performance. There are several scenarios where it
is recommended to use additional input
capacitance.
Output Capacitor Selection
Connect the boost-converter output capacitance
from Output to the reference ground plane. The
WD3133
Output capacitance controls the ripple voltage on
the Output rail and provides a low-impedance path
for the switching and transient-load currents of the
boost converter. It also sets the location of the
output pole in the control loop of the boost converter.
There are limitations to the minimum and maximum
capacitance on Output. The recommended
minimum capacitor on Output is 4.7μF, X5R or X7R
ceramic capacitor. For heavier load current, larger
output capacitor should be selected. The low ESR of
the ceramic capacitor minimizes ripple voltage and
power dissipation from the large, pulsating currents
of the boost converter and provides adequate phase
margin across all recommended operating
conditions. The allowed maximum operating voltage
of output capacitor should be larger enough than
VOUT.
Diode Selection
The rectifier diode supplies current path to the
inductor when the internal MOSFET is off. Use a
Schottky with low forward voltage to reduce losses.
The diode should be rated for a reverse blocking
voltage greater than the output voltage used. The
average current rating must be greater than the
maximum load current expected, and the peak
current rating must be greater than the peak
inductor current.
Diode the following requirements:
Low forward voltage
High switching speed : 50ns max.
Reverse voltage
Rated current
: > VOUT
: IPK or more
PC Board Layout Considerations
A good circuit board layout aids in extracting the
most performance from the WD3133. Poor circuit
layout degrades the output ripple and the
electromagnetic interference (EMI) or electro-
magnetic compatibility (EMC) performance. The
evaluation board layout is optimized for the WD3133.
Use this layout for best performance. If this layout
needs changing, use the following guidelines:
1. Use separate analog and power ground planes.
Will Semiconductor Ltd.
10 Aug, 2016 - Rev. 1.2

10 Page





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