IC AMP AUDIO PWR 1W MONO 8SOIC

TS4890ID

Manufacturer Part NumberTS4890ID
DescriptionIC AMP AUDIO PWR 1W MONO 8SOIC
ManufacturerSTMicroelectronics
TypeClass AB
TS4890ID datasheet
 


Specifications of TS4890ID

Output Type1-Channel (Mono)Max Output Power X Channels @ Load1W x 1 @ 8 Ohm
Voltage - Supply2.5 V ~ 5.5 VFeaturesDepop, Standby, Thermal Protection
Mounting TypeSurface MountPackage / Case8-SOIC (3.9mm Width)
ProductClass-AOutput Power1 W
Thd Plus Noise0.15 %Operating Supply Voltage3 V, 5 V
Supply Current6 mAMaximum Operating Temperature+ 85 C
Mounting StyleSMD/SMTAudio Load Resistance8 Ohms
Input Offset Voltage- 0.3 V to + 0.3 VInput Signal TypeSingle
Minimum Operating Temperature- 40 COutput Signal TypeDifferential
Supply TypeSingleSupply Voltage (max)5.5 V
Supply Voltage (min)2.2 VOperational ClassClass-A
Audio Amplifier Output Configuration1-Channel MonoOutput Power (typ)1x1@8OhmW
Audio Amplifier FunctionSpeakerTotal Harmonic Distortion0.15@8Ohm@250mW%
Single Supply Voltage (typ)3/5VDual Supply Voltage (typ)Not RequiredV
Supply Current (max)8@5VmAPower Supply RequirementSingle
Unity Gain Bandwidth Product (typ)2MHzRail/rail I/o TypeRail to Rail Output
Power Supply Rejection Ratio77dBSingle Supply Voltage (min)2.2V
Single Supply Voltage (max)5.5VDual Supply Voltage (min)Not RequiredV
Dual Supply Voltage (max)Not RequiredVOperating Temp Range-40C to 85C
Operating Temperature ClassificationIndustrialMountingSurface Mount
Pin Count8Package TypeSO
Lead Free Status / RoHS StatusContains lead / RoHS non-compliantOther names497-2292-5
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Power dissipation and efficiency
Hypothesis :
• Voltage and current in the load are sinusoidal
(Vout and Iout)
• Supply voltage is a pure DC source (Vcc)
Regarding the load we have :
V
V
sin
OUT
PEAK
and
V
OUT
I
OUT
R
L
and
2
V
PEAK
P
OUT
2
R
L
Then, the average current delivered by the supply
voltage is
V
PEAK
Icc
2
AVG
R
L
The power delivered by the supply voltage is
Psupply = Vcc Icc
(W)
AVG
Then, the power dissipated by the amplifier is
Pdiss = Psupply - Pout (W)
2
2
Vcc
Pdiss
P
OUT
R
L
and the maximum value is obtained when
Pdiss
0
P
OUT
and its value is
2
Vcc
Pdiss
max
2
R
Remark : This maximum value is only depending
on power supply voltage and load values.
The efficiency is the ratio between the output
power and the power supply
P
OUT
P
sup
ply
The maximum theoretical value is reached when
Vpeak = Vcc, so
Decoupling of the circuit
Two capacitors are needed to bypass properly the
TS4890. A power supply bypass capacitor Cs and
a bias voltage bypass capacitor Cb.
( t
) V
Cs has especially an influence on the THD+N in
high frequency (above 7kHz) and indirectly on the
power supply disturbances.
(
) A
With 100µF, you can expect similar THD+N
performances like shown in the datasheet.
If Cs is lower than 100µF, in high frequency
increase THD+N and disturbances on the power
(
W
)
supply rail are less filtered.
To the contrary, if Cs is higher than 100µF, those
disturbances on the power supply rail are more
filtered.
Cb has an influence on THD+N in lower frequency,
(
) A
but its function is critical on the final result of PSRR
with input grounded in lower frequency.
If Cb is lower than 1µF, THD+N increase in lower
frequency (see THD+N vs frequency curves) and
the PSRR worsens up
If Cb is higher than 1µF, the benefit on THD+N in
lower frequency is small but the benefit on PSRR
is substantial (see PSRR vs. Cb curves).
P
(
W
)
OUT
Note that Cin has a non-negligible effect on PSRR
in lower frequency. Lower is its value, higher is the
PSRR (see fig. 13).
Pop and Click performance
In order to have the best performances with the
pop and click circuitry, the formula below must be
2
follow :
(
W
)
L
With
and
V
PEAK
4
Vcc
TS4890
78
5 .
%
4
in
b
R (
R
)
C
(
) s
in
in
feed
in
50
k
C
(
) s
b
b
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