TS4961TIQT STMicroelectronics, TS4961TIQT Datasheet - Page 37

• Manufacturer Part Number: TS4961TIQT
• Description: IC AMP AUDIO PWR 1.95W D 16QFN
• Manufacturer: STMicroelectronics
• Type: Class Dr

Specifications of TS4961TIQT

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 1.95W x 1 @ 4 Ohm
• Voltage - Supply: 2.4 V ~ 4.3 V
• Features: Depop, Differential Inputs, Standby
• Mounting Type: Surface Mount
• Package / Case: 16-QFN
• For Use With: 497-8932 - BOARD EVAL FOR TS4961T
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8388-2

TS4961T
4.2
4.3
4.4
Low frequency response
If a low frequency bandwidth limitation is required, it is possible to use input coupling
capacitors.
In the low frequency region, C
with R
Therefore, for a desired cut-off frequency F
with R
Decoupling of the circuit
A power supply capacitor, referred to as C
part of the TS4961T.
The TS4961T has a typical switching frequency at 250 kHz and an output fall and rise time
at approximately 5 ns. Because of these very fast transients, careful decoupling is
mandatory.
A 1 µF ceramic capacitor is enough, but it must be located very close to the TS4961T in
order to avoid any extra parasitic inductance created by a long track wire. In relation with
dI/dt, this parasitic inductance introduces an overvoltage that decreases the global
efficiency and, if it is too high, may cause a breakdown of the device.
In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its
current capability is also important. A 0603 size is a good compromise, particularly when a
4 Ω load is used.
Another important parameter is the rated voltage of the capacitor. A 1 µF/6.3 V capacitor
used at 5 V, loses about 50% of its value. In fact, with a 5 V power supply voltage, the
decoupling value is about 0.5 µF instead of 1 µF. Since C
THD+N in the medium-high frequency region, this capacitor variation becomes decisive. In
addition, less decoupling means higher overshoots, which can be problematic if they reach
the power supply AMR value (6 V).
Wake-up time (t
There is a wait of approximately 5 ms when standby is released to set the device ON. The
TS4961T has an internal digital delay that mutes the outputs and releases them after this
time in order to avoid any pop noise.
in
in
, a first order high-pass filter with a -3 dB cut-off frequency:
in Ω and F
CL
in Hz.
WU
)
in
(input coupling capacitor) starts to have an effect. C
F
C
CL
in
=
=
S
CL
, is necessary to correctly bypass the class D
------------------------------------- -
2π
--------------------------------------- -
2π
, C
×
×
in
R
R
1
1
in
in
is calculated as follows:
×
×
Application component information
C
F
CL
in
S
has a particular influence on the
(Hz)
(F)
in
forms,
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