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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TS4890
Power amplifier design examples
Given :
• Load impedance : 8
• Output power @ 1% THD+N : 0.5W
• Input impedance : 10k
min.
• Input voltage peak to peak : 1Vpp
• Bandwidth frequency : 20Hz to 20kHz (0, -3dB)
• THD+N in 20Hz to 20kHz < 0.5% @Pout=0.45W
• Ambient temperature max = 50°C
• SO8 package
First of all, we must calculate the minimum power
supply voltage to obtain 0.5W into 8 . See curves
in fig. 15, we can read 3.5V. Thus, the power
supply voltage value min. will be 3.5V.
Following
the
maximum
equation :
2
Vcc
Pdiss
max
2
R
with 3.5V we have Pdissmax=0.31W.
Refer to power derating curves (fig. 24), with
0.31W the maximum ambient temperature will be
100°C. This last value could be higher if you follow
the example layout shows on the demoboard
(better dissipation).
The gain of the amplifier in flat region will be :
2
2
R
V
L
OUTPP
G
V
V
V
INPP
INPP
We have Rin > 10k . Let's take Rin = 10k , then
Rfeed = 28.25k . We could use for Rfeed = 30k
in normalized value and the gain will be Gv = 6.
In lower frequency we want 20 Hz (-3dB cut off
frequency). Then
1
C
IN
2
Rin
F
CL
So, we could use for Cin a 1µF capacitor value that
gives 16Hz.
In Higher frequency we want 20kHz (-3dB cut off
frequency). The Gain Bandwidth Product of the
TS4890 is 2MHz typical and doesn't change when
the amplifier delivers power into the load.
26/32
The first amplifier has a gain of
and the theoretical value of the -3dB cut of higher
frequency is 2MHz/3 = 660kHz.
We can keep this value or limiting the bandwidth
by adding a capacitor Cfeed, in parallel on Rfeed.
Then
So, we could use for Cfeed a 220pF capacitor
value that gives 24kHz.
Now, we can choose the value of Cb with the
constraint THD+N in 20Hz to 20kHz < 0.5% @
power
dissipation
Pout=0.45W. If you refer to the closest THD+N vs
frequency measurement : fig. 71 (Vcc=3.3V,
2
Gv=10), with Cb = 1µF, the THD+N vs frequency
(
W
)
is always below 0.4%. As the behaviour is the
L
same with Vcc = 5V (fig. 67), Vcc = 2.6V (fig. 67).
As the gain for these measurements is higher
(worst case), we can consider with Cb = 1µF, Vcc
= 3.5V and Gv = 6, that the THD+N in 20Hz to
20kHz range with Pout = 0.45W will be lower than
0.4%.
In the following tables, you could find three
another examples with values required for the
demoboard.
Remark : components with (*) marking are
P
OUT
. 5
65
optional.
Application n°1 : 20Hz to 20kHz bandwidth and
6dB gain BTL power amplifier.
Components :
R1
795
nF
R4
R6
R7*
R8
C5
C6
Rfeed
3
Rin
1
C
265
FEED
2
R
F
FEED
CH
Designator
Part Type
22k / 0.125W
22k / 0.125W
Short Cicuit
(Vcc-Vf_led)/If_led
10k / 0.125W
470nF
100µF
pF