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STMicroelectronics |
TS4962M
3W filter-free class D audio power amplifier
Features
■ Operating from VCC = 2.4V to 5.5V
■ Standby mode active low
■ Output power: 3W into 4Ω and 1.75W into 8Ω
with 10% THD+N max and 5V power supply.
www.Data■SheOeut4tUp.uctopmower: 2.3W @5V or 0.75W @ 3.0V
into 4Ω with 1% THD+N max.
■ Output power: 1.4W @5V or 0.45W @ 3.0V
into 8Ω with 1% THD+N max.
■ Adjustable gain via external resistors
■ Low current consumption 2mA @ 3V
■ Efficiency: 88% typ.
■ Signal to noise ratio: 85dB typ.
■ PSRR: 63dB typ. @217Hz with 6dB gain
■ PWM base frequency: 250kHz
■ Low pop & click noise
■ Thermal shutdown protection
■ Available in flip-chip 9 x 300μm (Pb-free)
Description
The TS4962M is a differential Class-D BTL power
amplifier. It is able to drive up to 2.3W into a 4Ω
load and 1.4W into a 8Ω load at 5V. It achieves
outstanding efficiency (88%typ.) compared to
classical Class-AB audio amps.
The gain of the device can be controlled via two
external gain-setting resistors. Pop & click
reduction circuitry provides low on/off switch noise
while allowing the device to start within 5ms. A
standby function (active low) allows the reduction
of current consumption to 10nA typ.
Pin connections
IN+
1/A1
GND
2/A2
OUT-
3/A3
VDD
4/B1
VDD
5/B2
GND
6/B3
IN-
STBY
OUT+
7/C1
8/C2
9/C3
IN+: positive differential input
IN-: negative differential input
VDD: analog power supply
GND: power supply ground
STBY: standby pin (active low)
OUT+: positive differential output
OUT-: negative differential output
Block diagram
C2 Stdby Internal
Bias
150k
B1 B2
Vcc
Out+
C3
C1 -
In-
In+ +
A1
PWM
Output
H
Bridge
150k
A3
Out-
Oscillator
GND
A2 B3
Applications
■ Cellular phone
■ PDA
■ Notebook PC
January 2007
Rev 4
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Contents
Contents
TS4962M
1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
www.DataSheet4U.com
5.1 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.2 Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 29
For example: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.5 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6 Wake-up time: (tWU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.7 Shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.8 Consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.9 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.10 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.11 Different examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Example 1: Dual differential inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Example 2: One differential input plus one single-ended input . . . . . . . . . . . . . . . 34
6 Demoboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7 Footprint recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
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