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
Fig. 105 : SO8 & MiniSO8 Demoboard Top
Solder Layer
Fig. 106 :
SO8 & MiniSO8 Demoboard Bottom
Solder Layer
BTL Configuration Principle
The TS4890 is a monolithic power amplifier with a
BTL output type. BTL (Bridge Tied Load) means
that each end of the load are connected to two
single ended output amplifiers. Thus, we have :
Single ended output 1 = Vout1 = Vout (V)
Single ended output 2 = Vout2 = -Vout (V)
And Vout1 - Vout2 = 2Vout (V)
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The output power is :
2 (
Vout
RMS
Pout
R
L
For the same power supply voltage, the output
power in BTL configuration is four times higher
than
the
output
power
configuration.
Gain In Typical Application Schematic
(cf. page 1)
In flat region (no effect of Cin), the output voltage
of the first stage is :
Rfeed
Vout
1
Vin
Rin
For the second stage : Vout2 = -Vout1 (V)
The differential output voltage is
Vout
2
Vout
1
2
Vin
The differential gain named gain (Gv) for more
convenient usage is :
Vout
2
Vout
1
Gv
Vin
Remark : Vout2 is in phase with Vin and Vout1 is
180 phased with Vin. It means that the positive
terminal of the loudspeaker should be connected
to Vout2 and the negative to Vout1.
Low and high frequency response
In low frequency region, the effect of Cin starts.
Cin with Rin forms a high pass filter with a -3dB cut
off frequency .
1
F
CL
2
RinCin
In high frequency region, you can limit the
bandwidth by adding a capacitor (Cfeed) in
parallel on Rfeed. Its form a low pass filter with a
-3dB cut off frequency .
1
F
CH
2
Rfeed
Cfeed
2
)
(
W
)
in
single
ended
(
) V
Rfeed
(
) V
Rin
Rfeed
2
Rin
(Hz)
(
Hz
)