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PDF RL622-150K Data sheet ( Hoja de datos )

Número de pieza RL622-150K
Descripción EVALUATION KIT
Fabricantes Microsemi Corporation 
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No Preview Available ! RL622-150K Hoja de datos, Descripción, Manual

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

1 page




RL622-150K pdf
LXE1710 EVALUATION BOARD
USER GUIDE
QUICK START GUIDE
The LXE1710 Evaluation Board is a fully functional,
Class-D Amplifier. Connection to a single supply
voltage (VDD from either a battery or power supply),
speakers, and your audio source is all that is required
to begin evaluating the amplifier and listening to music.
The following outlines the necessary connections and
control jumpers.
1) Verify contents of Evaluation Kit: The easy-to-
use amplifier is all contained on a single board.
Visually inspect to see if the board or any
components were damaged during shipping.
All components are located on the top side of
the PCB except for the decoupling capacitor,
C17. A copy of the LX1710/1711 Datasheet
should also be enclosed or a PDF version can
be downloaded from the Microsemi.com
website
(http://www.microsemi.com/datasheets/MSC1580.PDF).
2) Power and Ground Connections: The voltage
supply and ground connections are made
through terminal block TB1. Connect your “+”
(+7V to +15V) power supply or battery to the
+V input of TB1. Connect your supply or
battery ground to the GND input of TB1.
Please ensure the correct positive and ground
connections are made before turning on the
power supply.
3) Speaker Connection: The amplifier is designed
   $  ! #" 
“+” and “-“ to the +OUT and –OUT input of
terminal block TB2 respectively. The amplifier
Jumper
toward
OFF
J1 Jumper:
Amplifier
enabled
SLEEP/
(SLEEP/ is
OFF)
J2 Jumper:
Audio Input
enabled
MUTE
(MUTE is
OFF)
  Jumper Settings
Jumper
toward
ON
Amplifier
disabled
(SLEEP/ is
ON)
Audio Input
disabled
(MUTE is ON)
Jumper
floating
Amplifier
disabled
(SLEEP/ is
ON)
Audio Input
enabled
(MUTE is
OFF)
can be used to drive other speaker loads but
frequency response may not be optimal. See
LC filter design section for recommended
inductor and capacitor modifications.
4) Audio Input Connection: Connect your audio
source to the RCA Jack CN1, Audio In. For
other type interfaces, the audio input signal can
also be connected to the amplifier board using
the J3 (In- and In+) location. Strip Line Plugs
can be inserted into J3 for connectivity.
5) Jumper Selection Controls: The “on/off” or
enable to the module is controlled with the
SLEEP/ signal. Jumper J1 connects the
SLEEP/ to “on” or “ off”. SLEEP/ is an active
Low control. Jumper J2 connects the MUTE
control which enables/disables the audio input
to the amplifier. MUTE is an active High signal.
See table below.
6) Power Source: If a power supply is being used,
make sure it is set to the correct voltage level
and turn the power supply on.
7) Audio Source: Make sure the audio source
signal is set to a minimum level. Start or “play”
audio source and adjust source volume to
desired level.
8) Listen to AudioMAX: If the amplifier is not
operating properly, verify preceding steps or
contact Linfinity for technical assistance (714)
898-8121.
To Speaker + To Speaker -
To Power Supply +V
7V-15V for LX1710
7V-25V for LX1711
To Power Supply
Ground
Optional
Audio In -
Optional
Audio In +
To Audio
Source
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 5

5 Page





RL622-150K arduino
LXE1710 EVALUATION BOARD
USER GUIDE
MOSFET SELECTION
As seen in previous sections, the user can design the
output filter of the amplifier to meet performance or
costs targets. In addition, the amplifier’s power stage
(selection of MOSFETs) can be selected depending on
these tradeoffs. The efficiency of the amplifier circuit
can be approximated by the following equation.
=
POUT
PIN
=
I 2 RL
I 2[2(RNDS + RPDS + RIND) + RL] + PCROSS
Where
RL =
RNDS =
RPDS =
RIND =
PCROSS =
DC Resistance of Speaker
n-channel MOSFET on-resistance
p-channel MOSFET on-resistance
DC Resistance of Inductor
MOSFET Switching Loss
The overall efficiency is a function of primarily the
MOSFETs and output filter inductors. The “Inductor”
section’s contribution will be considered later. The
MOSFET Power loss is a function of the on-resistance
and gate charge.
   
MOSFET Power Loss = PDS = I 2[2(RNDS + RPDS)]
If PO = 25W at 4
Then I = P = 25 = 2.5A
R4
The LX1710 Evaluation Board is designed using
FDS4953 p-channel and FDS6612A n-channel
MOSFETS.
RNDS = 0.03, RPDS = 0.095
PDS = (2.5)2[2(0.03 + 0.095)] = 1.56W
MOSFET power loss is proportional to on-resistance.
      
MOSFET SwitchingLoss= PCROSS = CV 2 fSn
Where
C = Input Capacitance
V = Supply Voltage
fS = Switching Frequency
n = Number of MOSFETS
Assume C = 1000pF
V = 15VDC
fS = 500kHz
PCROSS = (1×109 )(152 )(500 ×103 )(4) = 0.45W
MOSFET switching loss is proportional to total gate
charge, supply voltage, and switching frequency.
There are a few other important parameters to
consider when selecting the output power components
besides the on-resistance and gate charge of the
MOSFETs. The drain-source voltage must provide
ample margin for circuit noise and high speed
switching transients. Since the amplifier configuration
requires output bridge operation at the supply voltage,
the MOSFETs should have a drain-source voltage of
at least 50% greater than the supply voltage. The
power dissipation of the MOSFETs should also be
able to dissipate the heat generated by the internal
losses and be greater than the sum of PDS and PCROSS.
Linfinity recommends that in selecting MOSFETs, RDS
0 1!1  2g <10nC. The table below provides
several MOSFET options.
FDS6612A FDS4953
Si4532ADY
IRF7105
Drain-Source On-Resistance
Drain-Source Voltage
RDS(ON)@VGS = +/-10V

VDSS (V)
n-channel
0.022
30
p-channel n-channel p-channel
0.053
0.053
0.08
-30 30 -30
n-channel
0.10
25
p-channel
0.25
-25
Drain Current (continuous)
ID(continuous) (A)
8.4
-5
4.9 -3.9
3.5
-2.3
Total Gate Charge
Qg (typical) (nC)
Manufacturer
  MOSFET Component Options
9
Fairchild
8
Fairchild
8
Vishay
Siliconix
10
Vishay
Siliconix
9.4 10
International International
Rectifier Rectifier
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
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