TS4998IQT STMicroelectronics, TS4998IQT Datasheet - Page 23

• Manufacturer Part Number: TS4998IQT
• Description: IC AMP AUDIO PWR 1W STER 16QFN
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4998IQT

• 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: Depop, Differential Inputs, Standby, Thermal Protection
• Mounting Type: Surface Mount
• Package / Case: 16-QFN
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 2-Channel Stereo
• Output Power (typ): 1x2@8OhmW
• Audio Amplifier Function: Speaker
• Total Harmonic Distortion: 0.5@8Ohm@700mW%
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Requirement: Single
• Unity Gain Bandwidth Product (typ): 1.5MHz
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 80dB
• Single Supply Voltage (min): 2.7V
• 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: 16
• Package Type: QFN EP
• For Use With: 497-8259 - BOARD EVAL BASED ON TS4998
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6842-2

TS4998
4.6
Note:
Power dissipation and efficiency
Assumptions:
●
●
The output voltage is:
and
and
Therefore, the average current delivered by the supply voltage is:
Equation 3
The power delivered by the supply voltage is:
Equation 4
Therefore, the power dissipated by each amplifier is:
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.
Load voltage and current are sinusoidal (V
Supply voltage is a pure DC source (V
P
diss
= P
supply
- P
out
(W)
P
P
supply
diss
I
ccAVG
Pdiss
P
=
= V
V
out
I
out
out
2 2V
---------------------- P
max
CC
π R
=
= 2
= V
=
∂Pdiss
-------------------- - = 0
V
-------------------- - (W)
I
∂P
CC
ccAVG
=
V
------------ - (A)
peak
2R
CC
L
R
V
---------------- - (A)
peak
out
2
out
)
πR
π
L
peak
Vcc
L
2
out
2
R
L
(W)
L
sinωt (V)
out
2
and I
(
W
–
P
)
out
out
(
)
W
)
Application information
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