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RL622-150K Schematic ( PDF Datasheet ) - Microsemi Corporation

Teilenummer RL622-150K
Beschreibung EVALUATION KIT
Hersteller Microsemi Corporation
Logo Microsemi Corporation Logo 




Gesamt 18 Seiten
RL622-150K Datasheet, Funktion
LXE1710 EVALUATION BOARD
USER GUIDE
 
   
 

A MICROSEMI COMPANY
Copyright © 2000
Rev. 1.1, 2000-12-01
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1






RL622-150K Datasheet, Funktion
LXE1710 EVALUATION BOARD
SCHEMATIC
USER GUIDE
VIN7V to 15V
SLEEP
MUTE
AUDIO
INPUT
C9
0.1µ F
C22
.1µF
35V
+
25 VDD
C13 +
2.2µF C11
24
+
PVDD
4.7µ F
26 CP
5 RPWM
R5 34.8K
6
CPW M
CLOCK 28NC
C17
220µF
25V
IS- 27
P+ 23
R12
10 ohm
C16 C1
100pF 1µF
1 VREF
4 V25
N+ 22
R11
C2 10 ohm
1µF 2 GND LX 171 0
P- 20
10 SLEEP
R6
10 ohm
11 MUTE
R8 10K
C26
330pF
R9 10K
NC
C3
470nF
C14
470nF
9 INAMPOUT
7 INPUT+
8 INPUT-
3 NC
C5
18pF
R1 56.2K
C4
150pF
14 EAOUT
13 EAIN
R2 10K
15 FAOUT
N-
PGND
21
R10
10 ohm
19
C10
4.7µ F
+
CN 18
FBK+ 16
FBK- 17
12
STATUS
NC
RS1
.0347
C12
.1µF
Q1
Q2
C8
.1µF
50V
Q3
Q4
L1 15µH
R3
24.3K
C7
220pF
C20
.68µ F
C21
.68µ F
R13
15 ohm
1W
C18
.47µ F
C19
.47µ F
L2 15µH
R4
24.3K
C6
220pF
 – Evaluation Board Schematic
Copyright © 2000
Rev. 1.1, 2000-12-01
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6

6 Page









RL622-150K pdf, datenblatt
LXE1710 EVALUATION BOARD
INDUCTOR SELECTION
The output filter inductors are key elements in the
performance of the Class-D audio power amplifier.
Inductor selection criteria also involves tradeoffs
between performance (efficiency) and component
costs. The critical specifications for the inductor are
the DC resistance, DC current, and peak current
ratings. The inductors should be able to handle the
amplifier’s power as well as operate within its linear
region. Saturating the inductors could decrease
performance (increase THD) and even produce a
short, which may damage either the circuit or the
speaker.
Other variables when selecting an inductor depend on
the switching frequency of the designed amplifier. A
higher switching frequency implies that the corner
frequency of the LC filter is higher. With a higher fC,
the inductor value is smaller.
The amplifier’s application and design constraints will
help determine whether the inductors are selected for
size, power, or performance. Various inductors such
as those that are shielded may also have different EMI
effects and distortion performance.
The overall efficiency () of the amplifier circuit is given
in the previous MOSFET section. The inductor’s
power loss contribution is a function of the inductor’s
DC resistance, RIND.
USER GUIDE
      
Inductor Power Loss = PIND = (I 2 )(2)(RIND)
The LX1710 Evaluation board utilizes two 15µH radial
leaded R.F. inductors from Inductor Supply, Inc. (ISI).
When evaluating component options, inductors such
as from Coilcraft can be used for other performance /
price tradeoffs. See inductor table below.
PIND = (2.52 )(2)(.056) = 0.7W
The efficiency approximation can now be completed.
=
POUT
PIN
=
I 2RL
I 2[2(RNDS + RPDS + RIND) + RL] + PCROSS

=
PDS
+
I 2RL
PIND + PCROSS
+
I 2 RL
 = 25
= 90.2%
1.56 + .7 + .45 + 25
The efficiency is a function of the power and switching
loss in the MOSFETs and inductors.
Manufacturer
Part Number
ISI RL622-150K
Coilcraft
DO5022P-153HC
  Inductor Component Options
Inductance

Q
min
15.0 50
Test
Frequency
2.520MHz
DC Resistance
 
DC Current
max (ARMS)
Self Resonant
Frequency min
(MHz)
56 2.50 12.0
15.0
100kHz
32
4.4
20
Copyright © 2000
Rev. 1.1, 2000-12-01
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 12

12 Page





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