D-class power amplifier
R2A15120FA
PRELI
MINAR
Y
some
param
etric lim
its are
subjec
t to ch
ange.
CONFIDENTIAL
11-8. Remarks of power ON and OFF
PWM Output
Internal
start-up timer
Hi-Z
STBYL
MUTEL
L
*1
Power ON
Please follow the following sequence when the power is turned on.
And, please follow by the opposite sequence when the power is turned off.
Mute
Duty50%
Tpro
*1
Under the protection
Mute
Duty50%
Normal Operation
Power OFF
*1) It is forbidden to set terminal STBYL and MUTEL at the intermediate voltage that is neither H nor L
constantly. Especially, please switch STBYL instantaneously so as not to cause chattering.
T
pro
is defined by built-in capacitance value of internal timer.
Tpro
≒
0.54sec
In addition, prevent from POP noise, please design the value of coupling capacitor for analog
input satisfying following condition 1.
Condition 1) It is necessary to charge the coupling capacitor C1 of input and set the system
stable state within 0.54sec.
4.6
×
(C1
x
(R1+11k))
<
Tpro
IN
R2
11kohm
C1
1uF
R1
VREF
Return time: Tpro≒270
/
fc[kHz]
fc[kHz]:Carrier frequency
Equivalent circuit (Power on)
Power ON
Power off
Recommended power on/off sequence
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