TS4994IST STMicroelectronics, TS4994IST Datasheet - Page 28

IC AMP AUDIO PWR 1W MONO 8MSOP

TS4994IST

Manufacturer Part Number
TS4994IST
Description
IC AMP AUDIO PWR 1W MONO 8MSOP
Manufacturer
STMicroelectronics
Type
Class ABr
Datasheet

Specifications of TS4994IST

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, Differential Inputs, Short-Circuit and Thermal Protection, Standby
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
For Use With
497-6396 - BOARD EVAL FOR LV TS4984IQT497-6395 - BOARD EVAL FOR LP DIFF TS4994IQT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-4452-2
Application information
4.8
4.9
28/35
To calculate the maximum ambient temperature T
Example: V
Using the power dissipation formula given above in
T
Equation 5
Therefore, the maximum allowable value for T
Decoupling of the circuit
Two capacitors are needed to correctly bypass the TS4994. A power supply bypass
capacitor C
C
indirect influence on power supply disturbances. With a value for C
similar THD+N performance to that shown in the datasheet.
In the high frequency region, if C
on the power supply rail are less filtered.
On the other hand, if C
more filtered.
C
result of PSRR (with input grounded and in the lower frequency region).
Wake-up time: t
When the standby is released to put the device ON, the bypass capacitor C
immediately. As C
properly until the C
time or t
TS4994 gain is close to zero. After the wake-up time, the gain is released and set to its
nominal value.
If C
wake-up time.
amb
s
b
has particular influence on the THD+N in the high frequency region (above 7kHz) and an
has an influence on THD+N at lower frequencies, but its function is critical to the final
b
The value of the power supply voltage, V
The value of the load resistor, R
The R
P
T
has a value other than 1µF, refer to the graph in
is calculated as follows:
amb
dissmax
WU
= 125-80x0.633=74°C
thja
s
and is specified in
CC
and a bias voltage bypass capacitor
= 633mW
value for the package type
= 5V, R
b
b
is directly linked to the bias of the amplifier, the bias will not work
voltage is correct. The time to reach this voltage is called the wake-up
L
s
WU
= 8Ω, R
is higher than 1µF, the disturbances on the power supply rail are
T
Table 3 on page
amb
thja
s
is lower than 1µF, it increases THD+N, and disturbances
=
= 80°C/W
L
125° C R
amb
CC
6, with C
TJHA
amb
C
is:
b
Equation 3
×
.
Figure 69 on page 20
allowable, you need to know:
P
dissmax
b
=1µF. During the wake-up time, the
this gives a result of:
s
of 1µF, you can expect
b
to establish the
is not charged
TS4994

Related parts for TS4994IST