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RT5509 Scheda tecnica(PDF) 53 Page - Richtek Technology Corporation

Il numero della parte RT5509
Spiegazioni elettronici  Speaker Amplifier with Speaker Protection
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Produttore elettronici  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

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RT5509
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation
DS5509-00
August
2017
www.richtek.com
53
Application Information
Inductor Selection
The recommended value of inductor for DC-to-DC
boost converter applications is 1
H. Small size and
better efficiency are the major concerns for portable
devices, such as the RT5509 used for mobile phone.
The inductor should have low core loss at 1MHz (Min.)
and low DCR for better efficiency.
The maximum current of inductor is highly depends on
the speaker impedance which determines the output
current of the boost converter. The inductor saturation
current rating should be considered to cover the
inductor peak current which can be approximated by
the following equation :
OUT
OUT
IN
S
L_max
IN
Boost
V
I
V
D T
I
=
+
η V
2 L
 

Following is the inductor selection reference for typical
speaker impedances with 10% tolerance and 95%
efficient.
RL (Ω)
IOUT (A)
IL_MAX (A)
Manufacturer
Part Number
8
1.14
1.43
Murata
MDT2520-CN1ROM
6
1.52
1.81
Coilcraft
PFL2512-102MEB
4
2.28
2.57
Coilcraft
LPS4012-102NLB
Capacitor Selection
For low ripple voltage, ceramic capacitors with low ESR
are recommended. A real (as opposed to ideal)
capacitor can be modeled simply as a resistor in series
with an ideal capacitor. The voltage drop across this
resistor minimizes the beneficial effects of the capacitor
in the circuit. X5R and X7R types are suitable because
of their wide voltage range and good operating
temperature characteristics. The capacitance value
decreases over the DC-biasing voltage range (30% to
70% decrease) as following figure. Consequently, the
nominal value of the capacitor should be close to twice
the minimum value specified
Worst X5R & Y5V Capacitance vs. DCV re. Voltage Rating
0%
20%
40%
60%
80%
100%
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
DC Voltage Relative to DCV Rating
X5R
Y5V


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