AN2406
Application note
TS4962IQ class D audio amplifier
Evaluation board user guidelines
Features
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TS4962IQ low voltage class D differential audio power amplifier with standby mode
Operating range from Vcc=2.4V to 5.5V
2.2W output power @ Vcc=5V, THD=1%, F=1kHz, with 4Ω load
1.4W output power @ Vcc=5V, THD=1%, F=1kHz, with 8Ω load
Ultra low power consumption in standby mode (10nA)
63dB PSRR @ 217Hz in grounded mode (Av=2V/V)
Low pop & click
Fast startup time: 5ms
Module gain set at 2V/V
Description
This mono class D demoboard is designed for the TS4962IQ class D audio amplifier. The
TS4962IQ device, in a DFN package, is mounted on a two-layer PCB with two power planes
acting as a heatsink.
Figure 1.
shows the schematic diagram of the demoboard.
Figure 1.
Schematic diagram of the mono class D demoboard
Vcc
Cn4
Vcc
C3
1uF
Gnd
Cn2
GND
1
Stdby
300k
C1
100nF
Internal
Bias
Out+
5
Output
PWM
H
Bridge
150k
Oscillator
GND
7
Cn3
GND
TS4962DFN
8
Out-
Cn5
Positive Output
Negative Output
Speaker
GND
6
Vcc
U1
Cn6
1
2
3
150k
Cn1
Positive input
R1
150k
Negative Input
Input
1
2
3
4
In-
In+
3
-
+
GND
R2
100nF
C2
150k
April 2007
Rev 2
1/5
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AN2406
Figure 2.
shows the top view of the demoboard PCB, with the markings showing the
connector placements.
Figure 2.
Mono class D demoboard - top view
Caution:
When you apply the power supply through Cn6, DO NOT invert the polarity because it would
destroy the amplifier U1.
Table 1
lists the connectors on the demoboard, with a description for each, and their
configurations.
Table 1.
Description of demoboard connectors and their configurations
Description
Input signal connector (active input signal positive and negative)
Connectors to modify input configuration (from capacitor-coupled = no jumper to
common mode feedback = short-circuit).
Output signal connector (Vo+ and Vo-)
Standby control connector (GND, Standby, V
CC
)
Power connector (V
CC
and GND). Power supply voltage from 2.4V to 5.5V.
Class D amplifier TS4962IQ
Connectors
Cn1
Cn2 and Cn3
Cn5
Cn4
Cn6
U1
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A list of the components mounted on the demoboard is given in
Table 2.
Table 2.
Component list for the mono class D demoboard
Quantity
1
1
1
1
1
1
1
1
1
1
1
1
Description
100nF/10V X7R/0603 capacitor
100nF/10V X7R/0603 capacitor
1μF/10V, X5R/0603 capacitor
3 pins header 2.54mm pitch
2 pins header 2.54mm pitch
2 pins header 2.54mm pitch
3 pins header 2.54mm pitch
2 pins header 2.54mm pitch
2 pins header 2.54mm pitch
150k, 1/16W/0603 1% resistor
150k, 1/16W/0603 1% resistor
TS4962IQ
Designation
C1
C2
C3
Cn1
Cn2
Cn3
Cn4
Cn5
Cn6
R1
R2
U1
Figure 3
and
Figure 4
show the demoboard PCB layers.
Figure 3.
PCB bottom layer
Figure 4.
PCB top layer
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Configuring the demoboard characteristics
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Configuring the demoboard characteristics
Differential gain
The demoboard is set up with the differential gain A
V
set to 2V/V.
If necessary, the differential gain can be adapted by modifying the values of resistors R1 and
R2, in accordance with the following relation:
300kΩ
-
A
v
= ----------------
or A
v
=
300kΩ
----------------
-
R1
R2
where R1=R2 in kΩ
.
Input configuration
On the demoboard, the Cn2 and Cn3 jumpers allow you to change the input configuration
between
capacitor-coupled
and
common-mode feedback.
In the
capacitor-coupled configuration,
the -3dB cut-off frequency in Hz is:
1
1
=
2
π ×
R
1
×
C
1
2
π ×
R
2
×
C
2
with R in Ohms, C in Farads and C1=C2.
More information about component calculations is available in the TS4962 datasheet.
Revision history
Date
Revision
Changes
28-Jul-2006
12-Apr-2007
1
2
Initial release.
Updated
Table 2: Component list for the mono class D demoboard
.
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AN2406
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