TS4961T Datasheet, PDF (38/49 Pages) STMicroelectronics – Mono class D audio power amplifier with dedicated analog switch

Application component information
TS4961T
4.5
Shutdown time (t_STBY)
When the standby command is set, the time required to put the two output stages into high
impedance and to put the internal circuitry in standby mode, is about 5 ms. This time is used
to decrease the gain and avoid any pop noise during shutdown.
4.6
Consumption in standby mode
Between the shutdown pin and GND there is an internal 300 kΩ resistor. This resistor forces
the TS4961T to switch to standby mode when the standby input is left floating.
However, this resistor also introduces additional power consumption if the standby pin
Obsolete ^{Product(s) - Obsolete Product(s) 4.7}
voltage is not 0 V.
Single-ended input configuration
The TS4961Tcan be used in a single-ended input configuration, but input coupling
capacitors are necessary. Figure 76 shows a typical single-ended input application.
Figure 76. Typical single-ended input application
Standby
Ve
GND
GND
Cin
Cin
Vcc
6
VCCA
Csa
12 ^Stdby Internal
1uF
Bias
300k
Out+ GND
Rin
150k
15 _-
In-
In+ ₊
16
Rin
150k
5
Output
PWM
H
Bridge
SPEAKER
8
Out-
Oscillator
TS4961T(Audio Amplifier Part)
GNDA
7
GND
All formulas are identical except for the gain (with R_in in kΩ) :
A_{V single}
=
-------------^V----^e-------------
Out⁺ – Out^-
=
3_----0_---0_--
R_in
Due to the internal resistor tolerance, A_Vsingle is in the range of:
2_----7_---3_--
R_in
≤
A_{V single}
≤
3_----2_---7_--
R_in
In the event that multiple single-ended inputs are summed, it is important that the
impedance on both TS4961 inputs (In^- and In⁺) be equal.
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