Datasheet TS4999 Datasheet (ST)

TS4999

Filter-free stereo 2.8 W class D audio power amplifier

with selectable 3D sound effects

Features

■ Operates from V

■ Dedicated standby mode active low/channel

■ Output power per channel: 2.8 W at 5 V into

4 Ω with 10% THD+N or 0.7 W at 3.6 V into 8 Ω
with 1% THD+N max.

■ Selectable 3D sound effect

■ Four gain setting steps: 3.5, 6, 9.5 and 12 dB

■ Low current consumption

■ PSSR: 63 dB typical at 217 Hz.

■ Fast start up phase: 7.8 ms

■ Short-circuit and thermal shutdown protection

■ Flip chip 18-bump lead-free package

= 2.4 to 5.5 V

CC

Applications

■ Cellular phones

■ PDAs

■ Notebook PCs

Flip chip 18-bump package

Pin connections (top view)

LOUT-

LOUT-

LOUT+

LOUT+

STDBYL

STDBYL

LPVCC

LPVCC

AGND

AGND

LIN- RIN-

LIN- RIN-

PGND

PGND

G1

G1

G0

G0

RPVCC

RPVCC

AVCC

AVCC

ROUT-

ROUT-

ROUT+

ROUT+

STDBYR

STDBYR

RIN+3D

Description

LIN+

LIN+

RIN+3D

The TS4999 is a stereo fully-differential class D
power amplifier. It can drive up to 1.35 W into a
8 Ω load at 5 V per channel. The device has four
different gain settings utilizing two discrete pins,
G0 and G1.

Pop and click reduction circuitry provides low
on/off switch noise while allowing the device to
start within 8 ms. 3D enhancement effects are
selected through one digital input pin that allows
more amazing stereo audio sound.

Two standby pins (active low) allow each channel
to be switched off separately.

The TS4999 is available in a flip chip, 18-bump,
lead-free package.

December 2008 Rev 1 1/36

www.st.com

36

Contents TS4999

Contents

1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.1 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.2 Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.3 3D effect enhancement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.4 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

4.5 Circuit decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

4.6 Wakeup (t

4.7 Consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4.8 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

4.9 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.10 Short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.11 Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

) and shutdown (t

WU

) times . . . . . . . . . . . . . . . . . . . . . . . 26

STBY

5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

5.1 Flip chip package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

5.2 Tape and reel package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

2/36

TS4999 Absolute maximum ratings

1 Absolute maximum ratings

Table 1. Key parameters and their absolute maximum ratings

Symbol Parameter Value Unit

(2)

(1)

(6)

(5)

(3)

6V

GND to V

CC

200 °C/W

Internally Limited

2kV

200 V

(4)

V

T

T

R

V

oper

Supply voltage

CC

Input voltage

in

Operating free air temperature range -40 to + 85 °C

Storage temperature -65 to +150 °C

stg

T

Maximum junction temperature 150 °C

j

Thermal resistance junction to ambient

thja

Pd Power dissipation

ESD

ESD

HBM: human body model

MM: machine model

Latch-up Latch-up immunity 200 mA

V

STBY

Standby pin voltage maximum voltage

GND to V

CC

Lead temperature (soldering, 10 secs) 260 °C

Output short-circuit protection

1. All voltages values are measured with respect to the ground pin.

2. The magnitude of input signal must never exceed VCC + 0.3 V / GND - 0.3 V

3. Device is protected in case of over temperature by a thermal shutdown active at 150° C.

4. Exceeding the power derating curves during a long period, involves abnormal operating condition.

5. Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for
all couples of pin combinations with other pins floating.

6. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω), done for all couples of pin
combinations with other pins floating.

7. Implemented short-circuit protection protects the amplifier against damage by short-circuit between
positive and negative outputs of each channel and between outputs and ground.

(7)

V

V

3/36

Absolute maximum ratings TS4999

Table 2. Operating conditions

Symbol Parameter Value Unit

V

V

Supply voltage

CC

Input voltage range GND to V

in

Standby voltage input

VSTBY

Device ON
Device OFF

RL Load resistor

VIH G0, G1, 3D, High Level Input Voltage

VIL G0, G1, 3D, Low Level Input Voltage GND

R

1. For VCC from 2.4 to 2.5 V, the operating temperature range is reduced to 0° C ≤ T

2. Without any signal on V

3. Minimum current consumption is obtained when V

4. Between G0, G1, 3D pins and GND, there is an internal 300 kΩ (+/-20 %) pull-down resistor. When pins
are floating, the gain is 3.5 dB and 3D effect is off. In full standby (left and right channels OFF), these
resistors are disconnected (HiZ input).

5. With a 4-layer PCB.

Table 3. 3D effect pin and STANDBY pins setting truth table

Thermal Resistance Junction to Ambient

thja

(1)

(2)

(4)

(5)

, the device will be in standby (internal 300 kΩ (+/-20 %) pull down resistor)

STBY

= GND

STBY

2.4 to 5.5 V

1.4 ≤ V

GND ≤ V

≤ VCC

STBY

≤ 0.4

STBY

≥4 Ω

1.4 ≤ VIH ≤ VCC V

≤ VIL ≤ 0.4 V

90 °C/W

≤70° C

amb

CC

V

(3)

3D STBYL STBYR 3D Effect Left channel Right channel

0 0 0 X STDBY STDBY

001OFFSTDBYON

010OFFONSTDBY

011OFFONON

1 0 0 X STDBY STDBY

1 0 1 N/A N/A N/A

1 1 0 N/A N/A N/A

1 1 1 ON ON ON

Note: When the 3D effect is switched on, both channels must be in operation or in shutdown mode

at the same time.

4/36

TS4999 Application information

2 Application information

Figure 1. Typical application schematic

Differential
Left Input

Left IN+

Left IN-

Differential
Right Input

Right IN+

Right IN-

Cs

VCC VCC

0.1uF

Gain

3D Effect

Control

C13D

D4

AVCC

Oscillator

Gain Select

Control

TS49 99

Cin

Cin

Lin+

A1

Select

Lin-

B2

G0

C3

C5

G1

RPVCC

PWM

CsR
1uF

D6

VCC

LPVCC

H

Bridge

CsL
1uF

B6

Lout+

A5

A7

Lout-

Left speaker

3D EFFECT

E1

Rin+

Cin

Cin

D2

A3

E3

Gain

Select

Rin-

STBYL

STBYR

Standby Control

Standby

Control

PWM

Protection

Circuit

B4

H

Bridge

PGNDAGND

C7

Rout+

Rout-

E5

E7

Right speaker

Note: See Section 4.9: Output filter considerations on page 29.

Table 4. External component description

Components Functional description

, CSL, C

C

S

C

in

Supply capacitor that provides power supply filtering.

SR

Input coupling capacitors that block the DC voltage at the amplifier input terminal.
The capacitors also form a high pass filter with Z
(Fcl = 1 / (2 x π x Zin x Cin)). Note that the value of Z

These coupling capacitors are mandatory.

5/36

in

changes with each gain setting.

in

Application information TS4999

Table 5. Pin description

Bump Name Function

A1 LIN+ Left channel positive differential input

B2 LIN- Left channel negative differential input

C1 3D 3D effect digital input pin

E1 RIN+ Right channel positive differential input

D2 RIN- Right channel negative differential input

A3 STBYL Standby input pin (active low) for left channel output

C3 G0 Gain select input pin (LSB)

E3 STBYR Standby input pin (active low) for right channel output

B4 AGND Analog ground

D4 AVCC Analog supply voltage

A5 LOUT+ Left channel negative output

C5 G1 Gain select input pin (MSB)

E5 ROUT+ Right channel positive output

B6 LPVCC Left channel power supply voltage

D6 RPVCC Right channel power supply voltage

A7 LOUT- Left channel negative output

C7 PGND Power ground

E7 ROUT- Right channel negative output

Table 6. Truth table for output gain settings

G1 G0 Gain value (dB)

0 0 3.5

01 6

10 9.5

11 12

Note: See Table 3 on page 4.

Table 7. Truth table for 3D effects pin settings

3D 3D effect

0OFF

1ON

6/36

TS4999 Electrical characteristics

3 Electrical characteristics

Table 8. VCC = +5 V, GND = 0 V, T

.

= 25° C (unless otherwise specified)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

I

I

STANDBY

Voo Output offset voltage

Supply current No input signal, no load, both channels 5 7 mA

CC

Standby current No input signal, Vstdby = GND 1 2 μA

Floating inputs, RL = 8Ω, G = 3.5dB,
3D effect off

20 mV

THD = 1% max, F = 1kHz, RL = 4Ω 2.25

Po Output power

THD+N

Total harmonic distortion +
noise

Efficiency Efficiency per channel

PSRR

Power supply rejection ratio
with inputs grounded

Crosstalk Channel separation

THD = 1% max, F = 1kHz, R

THD = 10% max, F = 1kHz, R

THD = 10% max, F = 1kHz, R

Po = 0.9W/Ch, G = 6dB, F=1kHz,

= 8Ω

R

L

Po = 2.3 W

Po = 1.4 W

= 1µF

C

in

, RL = 4Ω +15µH 82

RMS

, RL = 8Ω + 15µH 89

RMS

(1)

,3D effects off

F = 217Hz, RL = 8Ω, gain = 6dB,
Vripple = 200mVpp, Inputs grounded

F = 1kHz, R

= 8Ω,

L

3D effects off

= 8Ω 1.35

L

= 4Ω 2.8 W

L

= 8Ω 1.7 W

L

0.2 %

65 dB

100 dB

W

%

CMRR

Common mode rejection
ratio

Gain Gain value with no load

Single-ended input

IN

impedance referred to GND

Pulse width modulator
base frequency

F

Z

PWM

SNR Signal to noise ratio

t

WU

Wake-up time Total wake-up time

C

=1µF, F = 217Hz, RL = 8Ω, gain = 6dB,

in

ΔVIC = 200mVpp, 3D effects OFF

57 dB

G1 = G0 = "0" 3 3.5 4

G1 = "0" & G0 = "1" 5.5 6 6.5

dB

G1 = "1" & G0 = "0" 9 9.5 10

G1 = G0 = "1" 11.5 12 12.5

G1 = G0 = 3D = "0" or
G1 = "0" & G0 = "1" & 3D = "0" or

24 30 36 kΩ

G1 = "1" & G0 = "0" & 3D = "0"

G1 = "1" & G0 = "1" & 3D = "0" 12 15 18 kΩ

G1 = G0 = "0" & 3D = "1" or
G1 = "0" & G0 = "1" & 3D = "1" or

13.5 17.1 20.5 kΩ

G1 = "1" & G0 = "0" & 3D = "1"

G1 = "1" & G0 = "1" & G3D = "1" 6.5 8.6 10.5

190 280 370 kHz

= 1.3W, A-weighting, RL = 8Ω,

P

o

Gain = 6dB, 3D effects OFF

(2)

99 dB

9 13 16.5 ms

7/36

Electrical characteristics TS4999

Table 8. VCC = +5 V, GND = 0 V, T

= 25° C (unless otherwise specified) (continued)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

t

STBY

Standby time Standby time

(2)

11 15.8 20 ms

F = 20Hz to 20kHz, A-weighted,
Gain = 3.5dB
Filterless, 3D effect off, R
Filterless, 3D effect on, RL = 4Ω

V

Output voltage noise

N

With LC output filter, 3D effect off, R
With LC output filter, 3D effect on, RL = 4Ω
Filterless, 3D effect off, RL = 8Ω
Filterless, 3D effect on, R
With LC output filter, 3D effect off, RL = 8Ω
With LC output filter, 3D effect on, RL = 8Ω

1. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the super-imposed sinus signal to VCC at f = 217 Hz
with fixed Cin cap (input decoupling capacitor).

2. See Section 4.6: Wakeup (t

) and shutdown (t

WU

) times on page 26.

STBY

= 4Ω

L

= 8Ω

L

= 4Ω

L

31
50
30
48
32
51
31
50

μV

RMS

8/36

TS4999 Electrical characteristics

Table 9. VCC = +3.6V, GND = 0V, T

.

= 25°C (unless otherwise specified)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

I

I

STANDBY

Voo Output offset voltage

Po Output power

THD+N

Efficiency Efficiency per channel

PSRR

Crosstalk Channel separation

CMRR

Supply current No input signal, no load, both channels 3.5 5.5 mA

CC

Standby current No input signal, Vstdby = GND 1 2 μA

Floating inputs, RL = 8Ω, G = 3.5dB,
3D effect off

= 4Ω 1.15

L

= 8Ω 0.7

L

= 4Ω 1.45 W

L

= 8Ω 0.86 W

L

0.15 %

64 dB

102 dB

55 dB

Total harmonic distortion +
noise

Power supply rejection ratio
with inputs grounded

Common mode rejection
ratio

THD = 1% max, F = 1kHz, R

THD = 1% max, F = 1kHz, R

THD = 10% max, F = 1kHz, R

THD = 10% max, F = 1kHz, R

Po = 0.45W/Ch, G = 6dB, F=1kHz,

= 8Ω

R

L

Po = 1.15 W

Po = 0.7 W

= 1µF

C

in

F = 217Hz, R

, RL = 4Ω +15µH 82

RMS

, RL = 8Ω + 15µH 89

RMS

(1)

,3D effects off

= 8Ω, gain = 6dB,

L

Vripple = 200mVpp, inputs grounded

F = 1kHz, R

= 8Ω,

L

3D effects off

=1µF, F = 217Hz, RL = 8Ω, gain = 6dB,

C

in

ΔVIC = 200mVpp, 3D effects off

20 mV

W

%

Gain Gain value with no load

Single-ended input

IN

impedance referred to GND

Pulse width modulator
base frequency

F

Z

PWM

SNR Signal to noise ratio

t

WU

Wake-up time Total wake-up time

G1 = G0 = "0" 3 3.5 4

G1 = "0" & G0 = "1" 5.5 6 6.5

dB

G1 = "1" & G0 = "0" 9 9.5 10

G1 = G0 = "1" 11.5 12 12.5

G1 = G0 = 3D = "0" or
G1 = "0" & G0 = "1" & 3D = "0" or

24 30 36 kΩ

G1 = "1" & G0 = "0" & 3D = "0"

G1 = "1" & G0 = "1" & 3D = "0" 12 15 18 kΩ

G1 = G0 = "0" & 3D = "1" or
G1 = "0" & G0 = "1" & 3D = "1" or

13.5 17.1 20.5 kΩ

G1 = "1" & G0 = "0" & 3D = "1"

G1 = "1" & G0 = "1" & G3D = "1" 6.5 8.6 10.5 kΩ

190 280 370 kHz

P

= 0.67W, A-weighting, RL = 8Ω,

o

Gain = 6dB, 3D effects OFF

(2)

97 dB

7.5 11.3 15 ms

9/36

Electrical characteristics TS4999

Table 9. VCC = +3.6V, GND = 0V, T

= 25°C (unless otherwise specified) (continued)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

t

STBY

Standby time Standby time

(2)

10 13.8 18 ms

F = 20Hz to 20kHz, A-Weighted,
Gain = 3.5dB
Filterless, 3D effect off, R
Filterless, 3D effect on, RL = 4Ω

V

Output voltage noise

N

With LC output filter, 3D effect off, R
With LC output filter, 3D effect on, RL = 4Ω
Filterless, 3D effect off, RL = 8Ω
Filterless, 3D effect on, R
With LC output filter, 3D effect off, RL = 8Ω
With LC output filter, 3D effect on, RL = 8Ω

1. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the super-imposed sinus signal to VCC at f = 217 Hz
with fixed Cin cap (input decoupling capacitor).

2. See Section 4.6: Wakeup (t

) and shutdown (t

WU

) times on page 26.

STBY

= 4Ω

L

= 8Ω

L

= 4Ω

L

29
49
28
48
29
50
29
50

μV

RMS

10/36

TS4999 Electrical characteristics

Table 10. VCC = +2.5 V, GND = 0V, T

= 25° C (unless otherwise specified)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

I

I

STANDBY

Voo Output offset voltage

Po Output power

THD+N

Efficiency Efficiency per channel

PSRR

Crosstalk Channel separation

CMRR

Supply current No input signal, no load, both channels 2.8 4 mA

CC

Standby current No input signal, Vstdby = GND 1 2 μA

Floating inputs, RL = 8Ω, G = 3.5dB,
3D effect off

= 4Ω 0.53

L

= 8Ω 0.33

L

= 4Ω 0.67 W

L

= 8Ω 0.4 W

L

0.07 %

63 dB

104 dB

55 dB

Total harmonic distortion +
noise

Power supply rejection ratio
with inputs grounded

Common mode rejection
ratio

THD = 1% max, F = 1kHz, R

THD = 1% max, F = 1kHz, R

THD = 10% max, F = 1kHz, R

THD = 10% max, F = 1kHz, R

Po = 0.2W/Ch, G = 6dB, F=1kHz,

= 8Ω

R

L

Po = 0.52 W

Po = 0.33 W

= 1µF

C

in

F = 217Hz, R

, RL = 4Ω +15µH 81

RMS

, RL = 8Ω + 15µH 88

RMS

(1)

,3D effects off

= 8Ω, gain = 6dB,

L

Vripple = 200mVpp, Inputs grounded

F = 1kHz, R

= 8Ω,

L

3D effects off

=1µF, F = 217Hz, RL = 8Ω, gain = 6dB,

C

in

ΔVIC = 200mVpp, 3D effects off

20 mV

W

%

Gain Gain value with no load

Single-ended input

IN

impedance referred to GND

Pulse width modulator
base frequency

F

Z

PWM

SNR Signal to noise ratio

t

WU

Wake-up time Total wake-up time

G1 = G0 = "0" 3 3.5 4

G1 = "0" & G0 = "1" 5.5 6 6.5

dB

G1 = "1" & G0 = "0" 9 9.5 10

G1 = G0 = "1" 11.5 12 12.5

G1 = G0 = 3D = "0" or
G1 = "0" & G0 = "1" & 3D = "0" or

24 30 36 kΩ

G1 = "1" & G0 = "0" & 3D = "0"

G1 = "1" & G0 = "1" & 3D = "0" 12 15 18 kΩ

G1 = G0 = "0" & 3D = "1" or
G1 = "0" & G0 = "1" & 3D = "1" or

13.5 17.1 20.5 kΩ

G1 = "1" & G0 = "0" & 3D = "1"

G1 = "1" & G0 = "1" & G3D = "1" 6.5 8.6 10.5 kΩ

190 280 370 kHz

P

= 0.3W, A-weighting, RL = 8Ω,

o

Gain = 6dB, 3D effects OFF

(2)

94 dB

37.812ms

11/36

Electrical characteristics TS4999

Table 10. VCC = +2.5 V, GND = 0V, T

= 25° C (unless otherwise specified) (continued)

amb

Symbol Parameter Conditions Min. Typ. Max. Unit

t

STBY

Standby time Standby time

(2)

81216ms

F = 20Hz to 20kHz, A-Weighted,
Gain = 3.5dB
Filterless, 3D effect off, R
Filterless, 3D effect on, RL = 4Ω

V

Output voltage noise

N

With LC output filter, 3D effect off, R
With LC output filter, 3D effect on, RL = 4Ω
Filterless, 3D effect off, RL = 8Ω
Filterless, 3D effect on, R
With LC output filter, 3D effect off, RL = 8Ω
With LC output filter, 3D effect on, RL = 8Ω

1. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the super-imposed sinus signal to VCC at f = 217 Hz
with fixed Cin cap (input decoupling capacitor).

2. See Section 4.6: Wakeup (t

) and shutdown (t

WU

) times on page 26.

STBY

= 4Ω

L

= 8Ω

L

= 4Ω

L

28
47
27
45
28
48
28
47

μV

RMS

12/36

TS4999 Electrical characteristics

3.1 Electrical characteristic curves

The graphs shown in this section use the following abbreviations.

● R

● Filter = LC output filter (1 µF+ 30 µH for 4 Ω and 0.5 µF+15 µH for 8 Ω).

+ 15 µH or 30 µH = pure resistor + very low series resistance inductor.

L

All measurements are done with C
for the PSRR where C

SL

, C

SR

= CSR=1 µF and CS = 100 nF (see Figure 2), except

SL

is removed (see Figure 3).

Figure 2. Measurement test diagram

Cin

Cin

CsL

(CsR)

VCC

In+

1/2 TS4999

In-

GN D

1 F

GN D GN D

Out+

Out-

μ

Cs

100nF

15 H or 30 H

Audio Measurement

Bandwith < 30kHz

μμ

or

LC Filter

RL

4 or 8

Ω

5th order

50kHz

low-pass filter

13/36

Electrical characteristics TS4999

Figure 3. PSRR measurement test diagram

Cs

VCC

100nF

20Hz to 20kHz

μ

1 F
Cin

Cin

μ

1 F

GN D

5th order

50kHz

low-pass filter

GN D

Out+

In+

1/2 TS4999

In-

Out-

GN D

reference

Vripple

Vcc

GN D

4 or 8

μμ

15 H or 30 H

or

LC Filter

RM S Sel e cti v e Meas u re me n t

Band wit h = 1% of Fm ea s

RL

Ω

5th order

50kHz

low-pass filter

14/36

TS4999 Electrical characteristics

Effi

i

(

)

Dissipated Power (W)

Efficiency

(%)

Dissipated Power (W)

Efficiency

(%)

Dissipated Power (W)

Figure 4. Current consumption vs. power

supply voltage

6

No load
Tamb = 25°C

5

4

One channel active

3

2

1

Current Consumption (mA)

0

012345

Both channels active

Power Supply Voltage (V)

Figure 6. Standby current consumption vs.

power supply voltage

1.4
No load

V

= V

STBYL

1.2
Tamb = 25°C

1.0

A)

μ

0.8

0.6

0.4

Standby Current (

0.2

0.0

012345

= GND

STBYR

Power Supply Voltage (V)

Figure 5. Current consumption vs. standby

voltage (one channel)

3

2

1

Current Consumption (mA)

0

012345

Vcc=2.5V

Standby Voltage (V)

Vcc=5V

Vcc=3.6V

One channel active

No load
Tamb = 25°C

Figure 7. Efficiency vs. output power

(one channel)

100

80

%

60

ency
c

40

20

0

0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8

Efficiency

Power dissipation

Vcc = 5V
RL = 4Ω + 15μH
F = 1kHz
THD+N ≤ 10%

Output Power (W)

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

Figure 8. Efficiency vs. output power

(one channel)

100

80

Efficiency

60

40

20

0

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

Power dissipation

Output Power (W)

Vcc = 3.6V
RL = 4Ω + 15μH
F = 1kHz
THD+N ≤ 10%

Figure 9. Efficiency vs. output power

(one channel)

100

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

80

60

40

20

0

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Efficiency

Power dissipation

Vcc = 2.5V
RL = 4Ω + 15μH
F = 1kHz
THD+N ≤ 10%

Output Power (W)

15/36

0.24

0.22

0.20

0.18

0.16

0.14

0.12

0.10

0.08

0.06

0.04

0.02

0.00

Electrical characteristics TS4999

Efficiency

(%)

Dissipated Power (W)

Efficiency

(%)

Dissipated Power (W)

Efficiency

(%)

Dissipated Power (W)

Figure 10. Efficiency vs. output power

(one channel)

100

80

Efficiency

60

40

20

0

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

Power dissipation

Vcc = 5V
RL = 8Ω + 15μH
F = 1kHz
THD+N ≤ 10%

Output Power (W)

Figure 12. Efficiency vs. output power

(one channel)

100

80

60

40

20

0

0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45

Efficiency

Power dissipation

Vcc = 2.5V
RL = 8Ω + 15μH
F = 1kHz
THD+N ≤ 10%

Output Power (W)

Figure 11. Efficiency vs. output power

(one channel)

0.30

100

0.28

0.26

0.24

0.22

0.20

0.18

0.16

0.14

0.12

0.10

0.08

0.06

0.04

0.02

0.00

80

60

40

20

0

0.00.10.20.30.40.50.60.70.80.9

Power dissipation

Efficiency

Output Power (W)

Figure 13. THD+N vs. output power

0.08

0.06

0.04

0.02

0.00

10

F = 1kHz
RL = 4Ω + 15μH
G = +6dB
BW < 30kHz
Tamb = 25°C

1

THD + N (%)

0.1

0.01 0.1 1

Vcc=3.6V

Vcc=2.5V

Output power (W)

Vcc = 3.6V
RL = 8Ω + 15μH
F = 1kHz
THD+N ≤ 10%

Vcc=5V

0.15

0.10

0.05

0.00

Figure 14. THD+N vs. output power Figure 15. THD+N vs. output power

10

F = 1kHz
RL = 4Ω + 30μH
G = +6dB
BW < 30kHz
Tamb = 25°C

1

THD + N (%)

0.1

0.01 0.1 1

Output power (W)

Vcc=5V

Vcc=3.6V

Vcc=2.5V

16/36

10

F = 1kHz
RL = 8Ω + 15μH
G = +6dB
BW < 30kHz
Tamb = 25°C

1

THD + N (%)

0.1

0.01 0.1 1

Vcc=5V

Vcc=3.6V

Vcc=2.5V

Output power (W)

TS4999 Electrical characteristics

Figure 16. THD+N vs. output power Figure 17. THD+N vs. frequency

THD + N (%)

10

1

0.1

0.01

Vcc = 5V
RL = 4Ω + 15μH
G = +6dB
BW < 30kHz
Tamb = 25°C

20

Po=1500mW

100 1000 10000

Frequency (Hz)

10

F = 1kHz
RL = 8Ω + 30μH
G = +6dB
BW < 30kHz
Tamb = 25°C

1

THD + N (%)

0.1

0.01 0.1 1

Vcc=5V

Vcc=3.6V

Vcc=2.5V

Output power (W)

Figure 18. THD+N vs. frequency Figure 19. THD+N vs. frequency

THD + N (%)

10

0.1

Vcc = 3.6V
RL = 4Ω + 15μH
G = +6dB
BW < 30kHz
Tamb = 25°C

1

Po=800mW

Po=400mW

THD + N (%)

10

1

0.1

Vcc = 2.5V
RL = 4Ω + 15μH
G = +6dB
BW < 30kHz
Tamb = 25°C

Po=400mW

Po=750mW

Po=200mW

0.01
20 100 1000 10000

100 1000 10000

Frequency (Hz)

v

0.01
20

Frequency (Hz)

Figure 20. THD+N vs. frequency Figure 21. THD+N vs. frequency

THD + N (%)

10

1

0.1

0.01

Vcc = 5V
RL = 4Ω + 30μH
G = +6dB
BW < 30kHz
Tamb = 25°C

20

Po=1500mW

Po=750mW

100 1000 10000

Frequency (Hz)

THD + N (%)

10

1

0.1

0.01

Vcc = 3.6V
RL = 4Ω + 30μH
G = +6dB
BW < 30kHz
Tamb = 25°C

20

Po=800mW

100 1000 10000

Frequency (Hz)

Po=400mW

17/36

Electrical characteristics TS4999

Figure 22. THD+N vs. frequency Figure 23. THD+N vs. frequency

THD + N (%)

10

0.1

0.01

Vcc = 5V
RL = 4Ω + 30μH
G = +6dB
BW < 30kHz
Tamb = 25°C

1

20

Po=1500mW

Po=750mW

100 1000 10000

Frequency (Hz)

THD + N (%)

10

1

0.1

0.01

Vcc = 5V
RL = 8Ω + 15μH
G = +6dB
BW < 30kHz
Tamb = 25°C

20

Po=900mW

100 1000 10000

Frequency (Hz)

Figure 24. THD+N vs. frequency Figure 25. THD+N vs. frequency

THD + N (%)

10

0.1

Vcc = 3.6V
RL = 8Ω + 15μH
G = +6dB
BW < 30kHz
Tamb = 25°C

1

Po=450mW

Po=225mW

THD + N (%)

10

1

0.1

Vcc = 2.5V
RL = 8Ω + 15μH
G = +6dB
BW < 30kHz
Tamb = 25°C

Po=200mW

Po=450mW

Po=100mW

0.01
20

100 1000 10000

Frequency (Hz)

0.01
20

100 1000 10000

Frequency (Hz)

Figure 26. THD+N vs. frequency Figure 27. THD+N vs. frequency

THD + N (%)

10

1

0.1

0.01

Vcc = 5V
RL = 8Ω + 30μH
G = +6dB
BW < 30kHz
Tamb = 25°C

20

Po=900mW

Po=450mW

100 1000 10000

Frequency (Hz)

THD + N (%)

10

1

0.1

0.01

Vcc = 3.6V
RL = 8Ω + 30μH
G = +6dB
BW < 30kHz
Tamb = 25°C

20

Po=450mW

100 1000 10000

Frequency (Hz)

Po=225mW

18/36

TS4999 Electrical characteristics

Figure 28. THD+N vs. frequency Figure 29. Output power vs. power supply

voltage

10

Vcc = 2.5V
RL = 8Ω + 30μH
G = +6dB
BW < 30kHz
Tamb = 25°C

THD + N (%)

0.1

0.01

1

20

100 1000 10000

Po=200mW

Po=100mW

Frequency (Hz)

Figure 30. Output power vs. power supply

voltage

3.4
F = 1kHz

3.2

3.0

BW < 30kHz

2.8

Tamb = 25°C

2.6

2.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

Output power at 10% THD + N (W)

0.2

0.0

RL=4Ω +≥15μH

RL=8Ω +≥15μH

2.5 3.0 3.5 4.0 4.5 5.0 5.5

Supply voltage (V)

2.8
F = 1kHz

2.6
BW < 30kHz

2.4
Tamb = 25°C

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

Output power at 1% THD + N (W)

0.2

0.0

2.5 3.0 3.5 4.0 4.5 5.0 5.5

RL=4Ω +≥15μH

RL=8Ω +≥15μH

Supply voltage (V)

Figure 31. Crosstalk vs. frequency

(3D effect off)

0

Vcc = 5V

-10
RL = 4Ω +≥15μH

-20
G = +6dB

-30

Cin = 1μF
Tamb = 25°C

-40

-50

-60

-70

Crosstalk Level (dB)

-80

-90

-100

-110

-120
20

Po=500mW

Po=1500mW

100 1000 10000

Frequency (Hz)

Po=1000mW

Po=1800mW

Figure 32. Crosstalk vs. frequency

(3D effect off)

0

Vcc = 3.6V

-10
RL = 4Ω +≥15μH

-20
G = +6dB

-30

Cin = 1μF
Tamb = 25°C

-40

-50

-60

-70

Crosstalk Level (dB)

-80

-90

-100

-110

-120

Po=250mW

Po=750mW

20

100 1000 10000

Frequency (Hz)

Po=500mW

Po=900mW

Figure 33. Crosstalk vs. frequency

(3D effect off)

0

Vcc = 2.5V

-10
RL = 4Ω +≥15μH

-20
G = +6dB

-30

Cin = 1μF
Tamb = 25°C

-40

-50

-60

-70

-80

Crosstalk Level (dB)

-90

-100

-110

-120

19/36

20

Po=125mW

Po=250mW

100 1000 10000

Frequency (Hz)

Po=325mW

Po=450mW

Electrical characteristics TS4999

Figure 34. Crosstalk vs. frequency

(3D effect off)

0

Vcc = 5V

-10
RL = 8Ω +≥15μH

-20
G = +6dB

-30

Cin = 1μF
Tamb = 25°C

-40

-50

-60

-70

Crosstalk Level (dB)

-80

-90

-100

-110

-120

Po=300mW

Po=900mW

20

100 1000 10000

Po=600mW

Po=1100mW

Frequency (Hz)

Figure 36. Crosstalk vs. frequency

(3D effect off)

0

Vcc = 2.5V

-10
RL = 8Ω +≥15μH

-20
G = +6dB

-30

Cin = 1μF
Tamb = 25°C

-40

-50

-60

Crosstalk Level (dB)

-70

-80

-90

-100

-110

-120

Po=150mW

20

Po=75mW

Po=225mW

Po=270mW

100 1000 10000

Frequency (Hz)

Figure 35. Crosstalk vs. frequency

(3D effect off)

0

Vcc = 3.6V

-10
RL = 8Ω +≥15μH

-20
G = +6dB

-30

Cin = 1μF
Tamb = 25°C

-40

-50

-60

-70

Crosstalk Level (dB)

-80

-90

-100

-110

-120
20

Po=160mW

Po=320mW

100 1000 10000

Frequency (Hz)

Po=500mW

Po=600mW

Figure 37. Gain vs. frequency

(3D effect off)

5

4

3

Gain (dB)

2

Gain = 3.5dB

1

Vin = 400mVrms
Cin = 10μF
Tamb = 25°C

0

20

RL=8Ω+15μH

RL=8Ω+30μH

100 1k 10k

Frequency (Hz)

no load

RL=4Ω+15μH

RL=4Ω+30μH

20k

Figure 38. Gain vs. frequency

(3D effect off)

8

7

6

5

Gain (dB)

4

Gain = 6dB
Vin = 300mVrms

3

Cin = 10μF
Tamb = 25°C

2

20

100 1k 10k

RL=8Ω+15μH

Frequency (Hz)

20/36

no load

RL=8Ω+30μH

RL=4Ω+15μH

RL=4Ω+30μH

20k

Figure 39. Gain vs. frequency

(3D effect off)

12

11

10

9

8

Gain (dB)

7

Gain = 9.5dB
Vin = 200mVrms

6

Cin = 10μF
Tamb = 25°C

5

20

100 1k 10k

RL=8Ω+15μH

RL=8Ω+30μH

RL=4Ω+15μH

Frequency (Hz)

no load

RL=4Ω+30μH

20k

TS4999 Electrical characteristics

Figure 40. Gain vs. frequency

(3D effect off)

14

13

12

11

Gain (dB)

10

Gain = 12dB
Vin = 150mVrms

9

Cin = 10μF
Tamb = 25°C

8

20

100 1k 10k

RL=8Ω+15μH

RL=8Ω+30μH

RL=4Ω+15μH

Frequency (Hz)

Figure 42. PSRR vs. frequency

(3D effect off)

0

Inputs grounded

-10
Vcc = 3.6V, 3D effect off

Vripple = 200mVpp

-20
Cin = 10μF

RL = 8Ω +≥ 15μH

-30
Tamb = 25°C

-40

-50

PSRR (dB)

-60

-70

-80

-90

20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

no load

RL=4Ω+30μH

G=+12dB

G=+6dB

Figure 41. PSRR vs. frequency

(3D effect off)

0

Inputs grounded

-10

Vcc = 5V, 3D effect off
Vripple = 200mVpp

-20
Cin = 10μF

RL = 8Ω +≥ 15μH

-30
Tamb = 25°C

20k

-40

-50

PSRR (dB)

-60

-70

-80

-90

20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

Figure 43. PSRR vs. frequency

(3D effect off)

0

Inputs grounded

-10

Vcc = 2.5V, 3D effect off
Vripple = 200mVpp

-20

Cin = 10μF
RL = 8Ω +≥ 15μH

-30

Tamb = 25°C

-40

-50

PSRR (dB)

-60

-70

-80

-90

20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

G=+12dB

G=+6dB

G=+12dB

G=+6dB

Figure 44. PSRR vs. frequency

(3D effect on)

0

Inputs grounded

-10

Vcc = 5V, 3D effect on
Vripple = 200mVpp

-20

Cin = 10μF
RL = 8Ω +≥15μH

-30

Tamb = 25°C

-40

-50

PSRR (dB)

-60

-70

-80
20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

G=+12dB

G=+6dB

Figure 45. PSRR vs. frequency

(3D effect on)

0

Inputs grounded

-10

Vcc = 3.6V, 3D effect on
Vripple = 200mVpp

-20

Cin = 10μF
RL = 8Ω +≥ 15μH

-30

Tamb = 25°C

-40

-50

PSRR (dB)

-60

-70

-80
20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

21/36

G=+12dB

G=+6dB

Electrical characteristics TS4999

Figure 46. PSRR vs. frequency

(3D effect on)

0

Inputs grounded
Vcc = 2.5V, 3D effect on

-10
Vripple = 200mVpp

-20

Cin = 10μF
RL = 8Ω +≥ 15μH

-30

Tamb = 25°C

-40

-50

PSRR (dB)

-60

-70

-80

20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

Figure 48. CMRR vs. frequency

(3D effect off)

0

Vcc = 3.6V, 3D effect off

Δ

Vic = 200mVpp

-10
Cin = 10μF

RL = 8Ω +≥ 15μH

-20
Tamb = 25°C

-30

-40

-50

CMRR(dB)

-60

-70

-80

20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

G=+6dB

G=+12dB

G=+6dB

G=+12dB

Figure 47. CMRR vs. frequency

(3D effect off)

0

Vcc = 5V, 3D effect off

ΔVic = 200mVpp

-10
Cin = 10μF
RL = 8Ω +≥ 15μH

-20
Tamb = 25°C

-30

-40

-50

CMRR(dB)

-60

-70

-80

20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

G=+12dB

G=+6dB

Figure 49. CMRR vs. frequency

(3D effect off)

0

Vcc = 2.5V, 3D effect off

ΔVic = 200mVpp

-10
Cin = 10μF
RL = 8Ω +≥ 15μH

-20
Tamb = 25°C

-30

-40

-50

CMRR(dB)

-60

-70

-80

20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

G=+12dB

G=+6dB

Figure 50. CMRR vs. frequency

(3D effect on)

0

Vcc = 5V, 3D effect on

Δ

Vic = 200mVpp

-10
Cin = 10μF
RL = 8Ω +≥ 15μH

-20
Tamb = 25°C

-30

-40

-50

CMRR(dB)

-60

-70

-80

20

100 1000 10000

G=+9.5dB

G=+3.5dB

Frequency (Hz)

22/36

G=+12dB

G=+6dB

Figure 51. CMRR vs. frequency

(3D effect on)

0

Vcc = 3.6V, 3D effect on

Δ

Vic = 200mVpp

-10
Cin = 10μF
RL = 8Ω +≥ 15μH

-20
Tamb = 25°C

-30

-40

-50

CMRR(dB)

-60

-70

-80

20

100 1000 10000

G=+9.5dB

G=+3.5dB

Frequency (Hz)

G=+12dB

G=+6dB

TS4999 Electrical characteristics

Figure 52. CMRR vs. frequency

(3D effect on)

0

Vcc = 2.5V, 3D effect on

Δ

Vic = 200mVpp

-10
Cin = 10μF
RL = 8Ω +≥ 15μH

-20
Tamb = 25°C

-30

-40

-50

CMRR(dB)

-60

-70

-80

20

G=+9.5dB

G=+3.5dB

100 1000 10000

Frequency (Hz)

G=+12dB

G=+6dB

Figure 54. Startup and shutdown phase

V

= 5 V, G= 6 dB, Cin=1µF,

CC

V

=2Vpp, F= 500 Hz

in

Out+

Figure 53. Power derating curves

1.6

1.4

1.2

1.0

0.8

0.6

0.4

No Heat sink

0.2
AMR value

Flip-Chip Package Power Dissipation (W)

0.0

0 255075100125150

Ambiant Temperature (°C)

With a 4-layer PCB

Figure 55. Startup and shutdown phase

=5V, G=6dB, Cin= 1 µF, inputs

V

CC

grounded

Out+

Out-

Standby

Out-

Standby

Out+ - Out-

Out+ - Out-

23/36

Application information TS4999

4 Application information

4.1 Differential configuration principle

The TS4999 is a monolithic fully-differential input/output class D stereo power amplifier. The
TS4999 also features 3D effect enhancement that can be switched on or off by one digital
pin. Additionally, since the load is connected differentially compared to a single-ended
topology, the output is four times higher for the same power supply voltage.

A fully-differential amplifier offers the following advantages.

● A high PSRR (power supply rejection ratio).

● A high common mode noise rejection.

● Virtually zero pop with no additional circuitry, giving a faster start-up time compared to

conventional single-ended input amplifiers.

● Easier interfacing with differential output audio DACs.

4.2 Gain settings

In the flat region of the frequency-response curve (no input coupling capacitor or internal
feedback loop + load effect), the differential gain can be set to 3.5, 6, 9.5 or 12 dB,
depending on the logic level of the G0 and G1 pins, as shown in Tab l e 1 1 .

Table 11. Gain settings with G0 and G1 pins

G1 G0 Gain (dB) Gain (V/V)

003.51.5

0162

109.53

11124

Note: Between pins G0, G1 and GND there is an internal 300 kΩ (+/-20%) resistor. When the pins

are floating, the gain is 6 dB. In full standby (left and right channels OFF), these resistors
are disconnected (HiZ input).

4.3 3D effect enhancement

The TS4999 features 3D audio effects which can be switched off and switched on through
input pin 3D when used as a digital interface. The relation between the logic level of this pin
and the on/off 3D effect is shown in Table 3 on page 4 and Table 7 on page 6.

The 3D audio effect evokes the perception of spatial hearing of stereo audio signals and
improves this effect in cases where the stereo speakers are too close to each other, such as
in small or portable devices.

The perceived amount of 3D effect also depends on many factors such as speaker position,
distance between speakers, listener/frequency spectrum of the audio signal, as well as the
difference of signal between the left and right channel.

24/36

TS4999 Application information

In some cases, the speaker volume can increase when the 3D effect is switched on. This
factor is dependent on the composition and frequency spectrum of listened stereo audio
signal.

Note: 1 When the 3D effect is switched on, both channels must be in operation or shutdown mode at

the same time.

2 Between pin 3D and GND there is an internal 300 k

Ω

(+/-20%) resistor. When the pin is
floating, the 3D effect is off. In full standby (left and right channels OFF), this resistor is
disconnected (HiZ input).

4.4 Low frequency response

If a low frequency bandwidth limitation is required, input coupling capacitors can be used. In
the low frequency region, the input coupling capacitor C
with the input impedance Z

, a first order high-pass filter with a -3 dB cut-off frequency.

in

--------------------------------------------=

F

CL

2 π Z

1

⋅⋅ ⋅

inCin

starts to have an effect. Cin forms,

in

So, for a desired cut-off frequency F

with F

The input impedance Z

in Hz, Zin in Ω and Cin in F.

CL

is for the whole power supply voltage range and changes with the

in

C

CL

in

, C

is calculated as follows:

in

--------------------------------------------- -=

2 π Z

1

⋅⋅ ⋅

inFCL

gain setting. There is also a tolerance around the typical values (see Ta bl e 8 , Table 9 and

Ta bl e 1 0.

Figure 56. Cut-off frequency vs. input capacitor

Tamb=25°C

G=12dB, 3D on

100

10

G=3.5dB, 6dB, 9.5dB
3D off, Zin=30kΩ typ.

Zin=8.6kΩ typ.

G=12dB, 3D off
Zin=15kΩ typ.

Low -3dB Cut Off Frequency (Hz)

1

0.1 1

G=3.5dB, 6dB, 9.5dB
3D on, Zin=17.1kΩ typ.

Input Capacitor Cin (μF)

25/36

Application information TS4999

4.5 Circuit decoupling

Power supply capacitors, referred to as CS, C
TS4999.

The TS4999 has a typical switching frequency of 280 kHz and an output fall and rise time of
approximately 5 ns. Due to these very fast transients, careful decoupling is mandatory.

A 1 µF ceramic capacitor between each PVCC and PGND (C
ceramic capacitor between AVCC and AGND 0.1 µF (C
located as close as possible to the TS4999 in order to avoid any extra parasitic inductance
or resistance created by a long track wire. Parasitic loop inductance, in relation to di/dt,
introduces overvoltage that decreases the global efficiency of the device and may cause, if
this parasitic inductance is too high, the device to break down.

In addition, even if a ceramic capacitor has an adequate high frequency ESR (equivalent
series resistance) 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. With a power supply voltage of 5 V, the decoupling
value, instead of 1 µF, could be reduced to 0.5 µF. As C
THD+N in the medium-to-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).

4.6 Wakeup (tWU) and shutdown (t

During the wake-up sequence, there is a delay when the standby is released to switch the
device ON. The wake-up sequence of the TS4999 consists of two phases. During the first
phase t
phase t
selected by the digital pins G0 and G1. This startup sequence avoid any pop noise during
startup of the amplifier. See Figure 57: Wake-up phase

, a digitally-generated delay, mutes the outputs. Then, the gain increasing-

WU-A

begins. The gain increases smoothly from the mute state to the preset gain

WU-A

and CSR, are needed to correctly bypass the

SL

, CSR) and one additional

SL

) are sufficient, but they must be

S

has particular influence on the

S

) times

STBY

26/36

TS4999 Application information

Figure 57. Wake-up phase

STBY
Level

HI

LO

STBY

STBY

Time

Preset gainGain increasing

Gain

Mute

Mute

t

WU-A

t

WU

t

WU-B

Time

When the standby command is set, the time required to set the output stage to high
impedance and to put the internal circuitry in shutdown mode is called the standby time.
This time is used to decrease the gain from its nominal value set by the digital pins G0 and
G1 to mute and avoid any pop noise during shutdown. The gain decreases smoothly until
the outputs are muted. See Figure 58: Shutdown phase.

Figure 58. Shutdown phase

STBY
Level

HI

LO

STBY

STBY

Time

Gain

Preset gain

Gain decreasing

Mute

Mute

t

STBY

27/36

Time

Application information TS4999

4.7 Consumption in shutdown mode

Between the shutdown pin and GND there is an internal 300 kΩ (+-/20%) resistor. This
resistor forces the TS4999 to be in shutdown mode when the shutdown input is left floating.

However, this resistor also introduces additional shutdown power consumption if the
shutdown pin voltage is not at 0 V.

With a 0.4 V shutdown voltage pin for example, you must add 0.4 V/300 kΩ = 1.3 µA typical
(0.4 V/240 kΩ = 1.66 µA in maximum) for each shutdown pin to the standby current
specified in Ta ble 8, Table 9 and Tab l e 1 0 .

Of course, this current will be provided by the external control device for standby pins.

4.8 Single-ended input configuration

It is possible to use the TS4999 in a single-ended input configuration. Input coupling
capacitors are also mandatory in this configuration. The schematic diagram in Figure 59
shows a typical single-ended input application.

Figure 59. Typical single-ended input application

Le ft Inp ut

Right Input

LPVCC

H

Bridge

VCC

CsL
1uF

B6

A5

Lout+

A7

Lout-

Left spea ker

Cs

VCC VCC

0.1uF

Gain Select

Contro l

TS4999

Cin

Cin

Lin+

A1

Lin-

B2

G0

C3

G1

C5

Gain

Select

3D Effect

Contro l

C13D

D4

AVCC

Osci llator

PWM

D6

RPVCC

CsR
1uF

3D EFFECT

Rin+

E1

Cin

Cin

D2

A3

E3

Gain

Select

Rin-

STBYL

STBYR

Standby Control

Standby

Control

PWM

Protection

Circuit

B4

H

Bridge

PGNDAGND

Rout+

E5

Rout-

E7

Right speaker

C7

28/36

TS4999 Application information

4.9 Output filter considerations

The TS4999 is designed to operate without an output filter. However, due to very sharp
transients on the TS4999 output, EMI-radiated emissions may cause some standard
compliance issues.

These EMI standard compliance issues can appear if the distance between the TS4999
outputs and loudspeaker terminal are long (typically more than 50 mm, or 100 mm in both
directions, to the speaker terminals). Because 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.

● Reduce, as much as possible, the distance between the TS4999 output pins and the

speaker terminals.

● Use a ground plane for "shielding" sensitive wires.

● Place, as close as possible to the TS4999 and in series with each output, a ferrite bead

with a rated current of at least 2.5 A and 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 extra footprint to place, if necessary, a capacitor to short perturbations to ground

(see Figure 60).

Figure 60. Ferrite chip bead placement

From output

Ferrite chip bead

to speaker

about 100pF

gnd

In the case where the distance between the TS4999 output and the speaker terminals is too
long, it is possible to encounter low frequency EMI issues due to the fact that the typical
operating PWM frequency is 280 kHz and that the fall and rise time of the output signal is
less than or equal to 5 ns. In this configuration, it is necessary to use the output filter
represented in Figure 61 on page 30, which consists of L1, C1, L2 and C2 being placed as
close as possible to the TS4999 outputs.

In particular cases where the output filter is used and there is the possibility to disconnect a
load, we recommended using an RC network that consists of C3 and R, as shown in

Figure 61. In this case, when the output filter is connected without any load, the filter acts as

a short-circuit for frequencies above 10 kHz in the output frequency spectrum of the
amplifier. The RC network corrects the frequency response of the output filter and
compensates this limitation.

29/36

Application information TS4999

Table 12. Example of component selection

Component RL = 4 Ω RL = 8 Ω

L1 15μH / 1.4A 30μH / 0.7A

L2 15μH / 1.4A 30μH / 0.7A

C1 2μF / 10V 1μF / 10V

C2 2μF / 10V 1μF / 10V

C3 1μF / 10V 1μF / 10V

R22Ω / 0.25W 47Ω / 0.25W

Figure 61. LC output filter with RC network

LC Output Filter

OUT+

from TS2007

OUT-

4.10 Short-circuit protection

The TS4999 includes an output short-circuit protection. This protection prevents the device
from being damaged when faults occur on the amplifier outputs.

When a channel is in operating mode and a short-circuit occurs between two outputs of the
channel or between an output and ground, the short-circuit protection detects this situation
and puts the appropriate channel into standby mode. To put the channel back into operating
mode, it is necessary to put the channel’s standby pin to logical LO and then back to logical
HI and wake-up the channel.

L1

L2

C1

C2

RC network

C3

R

R

L

4.11 Thermal shutdown

The TS4999 device has an internal thermal shutdown protection mechanism to protect the
device from overheating in the event of extreme temperatures. The thermal shutdown
mechanism is activated when the device reaches 150° C. When the temperature decreases
to safe levels (around 135° C), the circuit switches back to normal operation.

30/36

TS4999 Package mechanical data

5 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.

5.1 Flip chip package

Figure 62. Flip chip package

2420 μm

2420 μm

Die size: 2.42x2.28 mm ± 100µm
Die height (including bumps): 600µm
Bumps diameter: 315µm ±50µm

2280 μm

750μm

750μm

500μm

500μm

866μm

866μm

866μm

866μm

2280 μm

600 μm

600 μm

Bump diameter before reflow: 300µm ±10µm
Bumps height: 250µm ±40µm
Die height: 350µm ±20µm
Pitch: 500µm ±50µm
Coplanarity: 50µm max
Optional*: Back coating height: 40µm

40 μm*

40 μm*

31/36

Package mechanical data TS4999

Figure 63. Pinout (top view)

7

LOUT-

6

5

LOUT+

4

3

STDBYL

2

1

LIN+

AEDCB

Figure 64. Marking (top view)

E

E

K9 X

K9 X

YWW

YWW

PGND

LPVCC

G1

AGND

G0

LIN- RIN-

■ ST Logo

■ Symbol for lead-free: E

■ Two first product code: K9

■ third X: Assembly Line Plant code

■ Three digits date code: Y for year - WW for week

■ The dot is for marking pin A1

RPVCC

AVCC

ROUT-

ROUT+

STDBYR

RIN+3D

32/36

TS4999 Package mechanical data

5.2 Tape and reel package

Figure 65. Schematic (top view)

1.5

4

4

1

11

A

A

8

8

Die size X + 70µm

Die size X + 70µm

4

4

All dimensions are in mm

All dimensions are in mm

User direction of feed

User direction of feed

A

A

Die size Y + 70µm

Die size Y + 70µm

1.5

1

11

Figure 66. Recommended footprint data

33/36

Ordering information TS4999

6 Ordering information

Table 13. Order codes

Part number

TS4999EIJT -40°C to +85°C Flip chip 18 Tape & reel K9

Temperature

range

Package Packing Marking

34/36

TS4999 Revision history

7 Revision history

Table 14. Document revision history

Date Revision Changes

18-Dec-2008 1 Initial release.

35/36

TS4999

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