TS4962IQT STMicroelectronics, TS4962IQT Datasheet - Page 34

• Manufacturer Part Number: TS4962IQT
• Description: IC AMP AUDIO PWR 2.8W MONO 8DFN
• Manufacturer: STMicroelectronics
• Type: Class Dr

Specifications of TS4962IQT

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 2.8W x 1 @ 4 Ohm
• Voltage - Supply: 2.4 V ~ 5.5 V
• Features: Depop, Differential Inputs, Standby, Thermal Protection
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• Product: Class-D
• Output Power: 2 W
• Available Set Gain: 6 dB
• Common Mode Rejection Ratio (min): 57 dB
• Thd Plus Noise: 1 %
• Operating Supply Voltage: 3 V, 5 V
• Supply Current: 2.3 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 8 Ohms
• Input Signal Type: Differential
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Differential
• Supply Type: Single
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.5 V
• For Use With: 497-6265 - BOARD EVAL FOR TS4962MEIJT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5993-2

Application information
4.10
34/44
We have the following equations.
In general, for mixed situations (single-ended and differential inputs) it is best to use the
same rule, that is, equalize impedance on both TS4962 inputs.
Output filter considerations
The TS4962 is designed to operate without an output filter. However, due to very sharp
transients on the TS4962 output, EMI-radiated emissions may cause some standard
compliance issues.
These EMI standard compliance issues can appear if the distance between the TS4962
outputs and the loudspeaker terminal is long (typically more than 50 mm, or 100 mm in both
directions, to the speaker terminals). As the PCB layout and internal equipment device are
different for each configuration, it is difficult to provide a one-size-fits-all solution.
However, to decrease the probability of EMI issues, there are several simple rules to follow.
●
●
●
●
Figure 63. Method for shorting perturbations to ground
Reduce, as much as possible, the distance between the TS4962 output pins and the
speaker terminals.
Use ground planes for "shielding" sensitive wires.
Place, as close as possible to the TS4962 and in series with each output, a ferrite bead
with a rated current of at least 2.5 A and an impedance greater than 50 Ω at
frequencies above 30 MHz. If, after testing, these ferrite beads are not necessary,
replace them by a short-circuit.
Allow enough footprint to place, if necessary, a capacitor to short perturbations to
ground (see
Figure
Out
63).
From TS4962 output
+
–
Out
Doc ID 10968 Rev 8
C
-
in
=
i
V e1
=
R
C eq
------------------------------------------------------- (F)
2
eq
×
×
Ferrite chip bead
------------ -
R in1
π
300
=
=
×
------------------ -
j 1
R
∑
j 1
k
=
Σ
=
+
1
k
ini
1
… V ek
--------- -
R
1
C in
+
×
ini
F
Gnd
i
CL
×
i
about 100pF
------------ -
R ink
300
To speaker
(V)
TS4962