TS4975EIJT STMicroelectronics, TS4975EIJT Datasheet - Page 28

• Manufacturer Part Number: TS4975EIJT
• Description: IC AMP AUDIO .04W AB 12FLIPCHIP
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of TS4975EIJT

• Output Type: Headphones, 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 40mW x 2 @ 16 Ohm
• Voltage - Supply: 2.5 V ~ 5.5 V
• Features: Depop, I²C, Standby, Thermal Protection, Volume Control
• Mounting Type: Surface Mount
• Package / Case: 12-FlipChip
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5199-2; TS4975EIJT

Application Information
4.4
Note:
28/36
The efficiency is the ratio between the output power and the power supply:
The maximum theoretical value is reached when V
The TS4975 is a stereo amplifier so 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:
Low frequency response
Input capacitor C
The input coupling capacitor blocks the DC part of the input signal at the amplifier input. In the
low-frequency region, C
with -3 dB cut-off frequency.
Z
For all inputs, the impedance value remains for all gain settings. This means that the lower cut-
off frequency doesn’t change with gain setting. Note also that 30 k
is tolerance around this value (see
From
in
is the input impedance of the corresponding input (30 k
Figure 53
P
P
Total P
diss 1
diss 2
you could easily establish the C
= Power dissipation due to the first channel power amplifier.
= Power dissipation due to the second channel power amplifier.
diss
diss 1
= P
= P
in
TotalP
in
diss 1
TotalP
diss 2
starts to have an effect. C
+ P
diss
, giving:
diss
TotalP
diss 2
F
=
=
C L
Chapter 3: Electrical Characteristics on page
=
2 2V
---------------------- P
------------------ -
P
=
=
P
supply
4 2V
---------------------- P
(W)
out
-- -
8
diss
----------------------- - Hz
2 Z
R
=
CC
L
R
C C
1
L
=
in
39.25%
=
C
2P
-------------------- -
in
out
4V
V
in
diss1
out
PEAK
–
value for a -3dB cut-off frequency required.
CC
PEAK
in
2P
–
2P
with Z
out
out
= V
W
in
W
CC
forms a first-order, high-pass filter
for In1 & In2).
/2, so
is a typical value and there
5).
TS4975