D-class power amplifier
R2A15120FA
PRELI
MINAR
Y
some
param
etric lim
its are
subjec
t to ch
ange.
CONFIDENTIAL
11-2. Output clip function
Output clip voltage can be set by external resistance value.
Clip voltage is defined by voltage at terminal RLMT(33pin):VLMT as shown below.
VRMT can be set from 0V to 5V by external resistor.
This IC can adjust the clip output power by using external resistor as shown fig. 11-1.
If this function is not used, the resistor between terminal RLMT and RREF is not necessary.
This circuit limits the maximum amplitude after gain setting stage.
(Please refer to "11-1 Gain Setting“ for gain setting.)
Fig.11-1 “Clip output power - Input signal voltage"
Fig.11-2 " Clip output voltage - VLMT"
RLMT
LIMIT
RREF
AVCC
Resistance value for setting
maximum output power
R
LMT
VLMT setting circuit
,
Differential input
Normal Operation
Normal Operation
H
H
Duty = 50%
Mute
L
H
Hi-Z
Standby
L
L
Output FET
Condition
Operating
condition
MUTEL
STBYL
Each mode setting of stand-by, mute mode or normal mode can be controlled by terminal STBYL and MUTEL.
11-3. Mode setting
Vpp-VLMT
VD=15V, RL=8Ω
0
5
10
15
20
25
30
0.0
1.0
2.0
3.0
4.0
5.0
VLMT:RLMT voltage[V]
O
u
tput
cl
ip
v
ol
ta
ge
:
V
p
p[
V
]
VD=15V
Page 35 of 152
Содержание STV-24LEDGR7
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