TS4890ID STMicroelectronics, TS4890ID Datasheet - Page 26

IC AMP AUDIO PWR 1W MONO 8SOIC

TS4890ID

Manufacturer Part Number
TS4890ID
Description
IC AMP AUDIO PWR 1W MONO 8SOIC
Manufacturer
STMicroelectronics
Type
Class ABr
Datasheet

Specifications of TS4890ID

Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1W x 1 @ 8 Ohm
Voltage - Supply
2.5 V ~ 5.5 V
Features
Depop, Standby, Thermal Protection
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Product
Class-A
Output Power
1 W
Thd Plus Noise
0.15 %
Operating Supply Voltage
3 V, 5 V
Supply Current
6 mA
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Audio Load Resistance
8 Ohms
Input Offset Voltage
- 0.3 V to + 0.3 V
Input Signal Type
Single
Minimum Operating Temperature
- 40 C
Output Signal Type
Differential
Supply Type
Single
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.2 V
Operational Class
Class-A
Audio Amplifier Output Configuration
1-Channel Mono
Output Power (typ)
1x1@8OhmW
Audio Amplifier Function
Speaker
Total Harmonic Distortion
0.15@8Ohm@250mW%
Single Supply Voltage (typ)
3/5V
Dual Supply Voltage (typ)
Not RequiredV
Supply Current (max)
8@5VmA
Power Supply Requirement
Single
Unity Gain Bandwidth Product (typ)
2MHz
Rail/rail I/o Type
Rail to Rail Output
Power Supply Rejection Ratio
77dB
Single Supply Voltage (min)
2.2V
Single Supply Voltage (max)
5.5V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SO
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
497-2292-5

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TS4890
Given :
• Load impedance : 8
• Output power @ 1% THD+N : 0.5W
• Input impedance : 10k
• 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
equation :
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 :
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
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
Power amplifier design examples
G
V
the
C
Pdiss
V
IN
V
OUTPP
INPP
maximum
2
max
Rin
1
2
F
2
min.
CL
2
V
Vcc
R
2
INPP
R
L
P
power
L
2
795
OUT
(
W
nF
)
. 5
dissipation
65
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% @
Pout=0.45W. If you refer to the closest THD+N vs
frequency measurement : fig. 71 (Vcc=3.3V,
Gv=10), with Cb = 1µF, the THD+N vs frequency
is always below 0.4%. As the behaviour is the
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
optional.
Application n°1 : 20Hz to 20kHz bandwidth and
6dB gain BTL power amplifier.
Components :
R1
R4
R6
R7*
R8
C5
C6
Designator
C
FEED
2
Rfeed
R
Rin
FEED
1
22k / 0.125W
22k / 0.125W
Short Cicuit
(Vcc-Vf_led)/If_led
10k / 0.125W
470nF
100µF
F
3
CH
Part Type
265
pF

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