TS4909IQT STMicroelectronics, TS4909IQT Datasheet - Page 26

• Manufacturer Part Number: TS4909IQT
• Description: IC AMP AUDIO .158W STER AB 10DFN
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4909IQT

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 158mW x 2 @ 16 Ohm
• Voltage - Supply: 2.2 V ~ 5.5 V
• Features: Depop, Standby
• Mounting Type: Surface Mount
• Package / Case: 10-DFN
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 2-Channel Stereo
• Audio Amplifier Function: Headphone
• Total Harmonic Distortion: 0.3@16Ohm@90mW%
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Supply Current (max): 4.8@5VmA
• Power Supply Requirement: Single
• Power Dissipation: 1.79W
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 72dB
• 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: 10
• Package Type: DFN
• For Use With: 497-6380 - BOARD DEMO FOR TS4909Q
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5992-2

Application information
4.4.3
4.5
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The efficiency is the ratio between the output power and the power supply:
The maximum theoretical value is reached when V
Total power dissipation
The TS4909 is a stereo (dual channel) amplifier. It has two independent 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
Single-ended configuration:
Phantom ground configuration:
Decoupling of the circuit
Two capacitors are needed to properly bypass the TS4909 — a power supply capacitor C
and a bias voltage bypass capacitor C
C
the power supply disturbances. With 1 μF, you could expect the THD+N performance to be
similar to the values shown in this datasheet. If C
high frequencies and disturbances on the power supply rail are less filtered. On the contrary,
if C
C
of PSRR with inputs grounded in lower frequencies:
●
●
s
b
has a strong influence on the THD+N at high frequencies (above 7kHz) and indirectly on
has an influence on THD+N at lower frequencies, but its value is critical on the final result
s
P
P
Total P
If C
(increases).
If C
is small.
is higher than 1 μF, those disturbances on the power supply rail are more filtered.
diss 1
diss 2
b
b
is lower than 1 μF, THD+N increases at lower frequencies and the PSRR worsens
is higher than 1 μF, the benefit on THD+N and PSRR in the lower frequency range
= power dissipation due to the first channel power amplifier (V
= power dissipation due to the second channel power amplifier (V
diss
= P
diss 1
diss 1
= P
+ P
diss 2
TotalP
TotalP
diss 2
, giving:
TotalP
(W)
diss
diss
diss
η
b
=
=
.
=
η
2 2V
---------------------- P
4 2V
---------------------- P
=
=
-- -
8
π
π R
π R
2P
------------------ -
P
=
P
supply
CC
CC
L
L
39.25%
OUT
diss1
s
is lower than 1 μF, THD+N increases at
OUT
OUT
=
=
PEAK
2P
πV
-------------------- -
4V
–
–
diss2
PEAK
2P
2P
CC
= V
OUT
OUT
CC
/2, so:
out1
).
out2
).
TS4909
s