TS4997IQT STMicroelectronics, TS4997IQT Datasheet - Page 24

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TS4997IQT

Manufacturer Part Number
TS4997IQT
Description
IC AMP AUDIO 1W STER AB 16QFN
Manufacturer
STMicroelectronics
Type
Class ABr
Datasheet

Specifications of TS4997IQT

Output Type
2-Channel (Stereo)
Max Output Power X Channels @ Load
1W x 2 @ 8 Ohm
Voltage - Supply
2.7 V ~ 5.5 V
Features
3D, Depop, Differential Inputs, Standby, Thermal Protection
Mounting Type
Surface Mount
Package / Case
16-QFN
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-5995-2

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TS4997IQT
Manufacturer:
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Part Number:
TS4997IQT
Manufacturer:
ST
Quantity:
20 000
Application information
Note:
24/34
and the maximum value is obtained when:
and its value is:
Equation 5
This maximum value is only dependent on the power supply voltage and load values.
The efficiency is the ratio between the output power and the power supply:
Equation 6
The maximum theoretical value is reached when V
The TS4997 is stereo amplifier so it has two power amplifiers. Each amplifier produces heat
due to its power dissipation. Therefore, the maximum die temperature is the sum of each
amplifier’s maximum power dissipation. It is calculated as follows:
In most cases, P
The maximum die temperature allowable for the TS4997 is 150°C. In case of overheating, a
thermal shutdown protection set to 150°C, puts the TS4997 in standby until the temperature
of the die is reduced by about 5°C.
To calculate the maximum ambient temperature T
Example: V
Using the power dissipation formula given in
channel is:
And the power dissipated by both channels is:
P
P
Total P
the power supply voltage value, V
the load resistor value, R
the package type, R
P
Total P
diss 1
diss 2
dissmax
= Power dissipation of left channel power amplifier
= Power dissipation of right channel power amplifier
diss
dissmax
CC
= 633mW
=5V, R
=P
diss 1
diss 1
= 2 x P
L
= P
TotalP
=8Ω, R
+ P
THJA
diss 2
dissmax
diss 2
diss
L
THJA
, giving:
(W)
= 2
= 1266mW
QFN16=85°C/W (with 2-layer PCB with vias).
Pdiss
×
η =
P
CC
diss1
max
η =
------------------ - =
P
∂Pdiss
-------------------- - = 0
P
supply
∂P
=
out
π
---- - = 78.5%
Equation
4
=
2
out
π
Vcc
2
4 2V
---------------------- P
R
π R
L
2
amb
--------------------
πV
peak
(
4Vcc
W
CC
L
)
peak
allowable, you need to know:
5, the maximum dissipated power per
= V
out
CC
, so:
2P
out
(
W
)
TS4997

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