TRIPATH TECHNOLOGY TA2022 Datasheet

TECHNICAL INFORMATION

Stereo 90W (4
Digital Power Processing

ADVANCED INFORMATION - December 2000

ΩΩΩΩ

) Class-T Digital Audio Amplifier using

TM

Technology TA2022

General Description

The TA2022 is an 90W continuous average, per channel, Class-T Digital Audio Power
Amplifier IC using Tripath’s proprietary Digital Power Processing
amplifiers offer both the audio fidelity of Class-AB and the power efficiency of Class-D
amplifiers.

Applications

!"DVD Players
!"Mini/Micro Component Systems
!"Home Theater
!"Powered Speakers

Benefits

!"Fully integrated solution with internal

FETs

!"Dramatically improves efficiency versus

Class-AB

!"Signal fidelity equal to high quality linear

amplifiers

!"High dynamic range compatible with

digital media such as CD, DVD, and
internet audio

Features

!"Class-T architecture
!"High Power

!"100W @ 4Ω, 1.0% THD+N
!"90W @ 4Ω, 0.1% THD+N

!"60W @ 8Ω, 0.1% THD+N

!"“Audiophile” Quality Sound

!"0.015% THD+N @ 70W 4Ω
!"0.015% THD+N @ 45W 8Ω
!"0.10% IHF-IM @ 25W 4Ω

!"High Efficiency

!"92% @ 88W 8Ω

!"87% @ 125W 4Ω
!"Dynamic Range = 102 dB
!"Mute Input
!"Over-current protection
!"Over and under-voltage protection
!"Single ended outputs
!"Outputs can be operated in bridged mode
!"32-pin SSIP package

TM

technology. Class-T

1 of 29 TA2022, Rev. 0.90, 12.00

TECHNICAL INFORMATION

Absolute Maximum Ratings

SYMBOL PARAMETER Value UNITS

VPP, VNN Supply Voltage (VPP1, VPP2, VNN1, VNN2) +/-40 V

V5 Positive 5V Bias Supply

VN10 Voltage for low-side FET drive VNN + 13 V

T

STORE

T

A

T

J

ESDHB ESD Susceptibility – Human Body Model (Note 3)

ESDMM ESD Susceptibility – Machine Model (Note 4)

Voltage at Input Pins (pins 18, 19, 23, 24, 26, 28, 29, 30, 31, 32)

Storage Temperature Range

Operating Free-air Temperature Range (Note 2)

Junction Temperature

All pins (except pin 27)
Pin 27

All pins

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.

See the table below for Operating Conditions.
Note 2: This is a target specification. Characterization is still needed to validate this temperature range.
Note 3: Human body model, 100pF discharged through a 1.5KΩ resistor.
Note 4: Machine model, 220pF – 240pF discharged through all pins.

Operating Conditions

SYMBOL PARAMETER MIN. TYP. MAX. UNITS

VPP, VNN Supply Voltage (VPP1, VPP2, VNN1, VNN2) +/-12 +/-31 +/-36 V

V5

VN10

Positive 5V Bias Supply 4.5 5 5.5 V

Voltage for low side FET drive (Volts above VNN) 9 11 12 V

Note 5: Recommended Operating Conditions indicate conditions for which the device is functional.

See Electrical Characteristics for guaranteed specific performance limits.

Thermal Characteristics

SYMBOL PARAMETER Value UNITS

θ

JC

θ

JA

Junction-to-case Thermal Resistance

Junction-to-ambient Thermal Resistance (still air)

(Note 5)

(Note 1)

-55

-40

6

to 150°

°

to 85°

°

150

°

4000
1500

200

-0.3V to (V5 +0.3V)

V
V

C

C

C

V
V

V

1.0

20

°

°

C/W

C/W

2 of 27 TA2022, Rev. 0.90, 12.00

TECHNICAL INFORMATION

Electrical Characteristics

(Notes 6, 7)

TA = 25 °C. See Application/Test Circuit on page 7. Unless otherwise noted, the supply voltage is
VPP=|VNN|=31V.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNITS

I

q

I

MUTE

VIH High-level input voltage (MUTE) 3.5 V

VIL Low-level input voltage (MUTE) 1.0 V

VOH High-level output voltage (HMUTE) I

VOL Low-level output voltage (HMUTE) I

V

OFFSET

IOC Over Current Sense Threshold TBD TBD TBD A

I

VPPSENSE

V

VPPSENSE

I

VNNSENSE

V

VNNSENSE

Quiescent Current
(No load, Mute = 0V)

Mute Supply Current
(No load, Mute = 5V)

Output Offset Voltage No Load, MUTE = Logic low

VPPSENSE Threshold Currents Over-voltage turn on (muted)

Threshold Voltages with

R

VPPSENSE

(Note 11)

VNNSENSE Threshold Currents Over-voltage turn on (muted)

Threshold Voltages with

R

VNNSENSE

(Note 11)

= 249KΩ

= 249KΩ

VPP = +31V
VNN = -31V (Note 8)
V5 = 5V (Note 9)
VN10 = 11V (Note 10)
VPP = +31V
VNN = -31V (Note 8)
V5 = 5V (Note 9)

= 3mA 3.5 V

OH

= 3mA 1.0 V

OL

0.1% R

Over-voltage turn off (mute off)
Under-voltage turn off (mute off)
Under-voltage turn on (muted)

Over-voltage turn on (muted)
Over-voltage turn off (mute off)
Under-voltage turn off (mute off)
Under-voltage turn on (muted)

Over-voltage turn off (mute off)
Under-voltage turn off (mute off)
Under-voltage turn on (muted)

Over-voltage turn on (muted)
Over-voltage turn off (mute off)
Under-voltage turn off (mute off)
Under-voltage turn on (muted)

FBA

, R

FBB

, R

resistors

FBC

20

55
45
65

0.5
2

20

-750 750 mV

62

65

162
154

79
72

42.8

40.9

22.2

20.4
174

169

86
77

-42.1

-40.8

-20.2

-17.9

138

36.5

17.8

152

-36.2

-14.8

60
80

25

178

87

47.3

24.4

191

95

-46.8

-22.6

mA
mA
mA
mA
mA
mA
mA

A

µ

A

µ

A

µ

A

µ

V
V
V
V

A

µ

A

µ

A

µ

A

µ

V
V
V
V

TA2022, Rev. 0.90, 12.00 3 of 27

TECHNICAL INFORMATION

Performance Characteristics – Single Ended

(Notes 6, 7)

TA = 25 °C. Unless otherwise noted, the supply voltage is VPP=|VNN|=31V, the input frequency is
1kHz and the measurement bandwidth is 20kHz. See Application/Test Circuit on page 7.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNITS

P

OUT

THD + N Total Harmonic Distortion Plus

IHF-IM IHF Intermodulation Distortion

SNR Signal-to-Noise Ratio A-Weighted

CS Channel Separation

AV Amplifier Gain

A

VERROR

η

I

SLOAD

e

NOUT

Output Power
(Continuous Average/Channel)
(Note 12)

Noise

Channel to Channel Gain Error

Power Efficiency

Source Current

Output Noise Voltage A-W eighted, input AC grounded 150

VPP = |VNN| = +/-31V, R

THD+N = 0.1%
THD+N = 1.0%
THD+N = 10%

VPP = |VNN| = +/-35V, R

THD+N = 0.1%
THD+N = 10%

= 70W/Channel, RL = 4Ω

P

OUT

VPP = |VNN| = +/-31V

= 45W/Channel, RL = 8Ω

P

OUT

VPP = |VNN| = +/-35V
19kHz, 20kHz, 1:1 (IHF), R

= 25W/Channel

P

OUT

0dB = 90W/Channel, R
0dB = 25W, R

P

OUT

See Application / Test Circuit
P

OUT

See Application / Test Circuit
P

OUT

P

OUT

P

OUT

VPP = +31V
VNN = -31V
V5 = 5V

= 4Ω,

L

= 10W/Channel, RL = 4Ω,

= 10W/Channel, RL = 4Ω

= 88W/Channel, RL = 8
= 125W/Channel, RL = 4Ω
= 125W/Channel, RL = 4

L

L

= 4Ω

L

Performance Characteristics – Bridged Tied Load

TA = 25 °C. Unless otherwise noted, the supply voltage is VPP=|VNN|=30V, the input frequency is
1kHz and the measurement bandwidth is 20kHz.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNITS

P

OUT

THD + N Total Harmonic Distortion Plus

IHF-IM IHF Intermodulation Distortion

η

SNR Signal-to-Noise Ratio

e

NOUT

Output Power
(Continuous Average)
(Note 12)

Noise

Power Efficiency

Output Noise Voltage A-W eighted, input AC grounded 220

VPP = |VNN| = +/-30V, R

THD+N = 0.1%
THD+N = 10%

= 100W, RL = 8Ω

P

OUT

19kHz, 20kHz, 1:1 (IHF), R

= 25W

P

OUT

= 225W, RL = 8Ω

P

OUT

A-Weighted, R
0dB = 150W

L

= 8

Ω

L

= 4Ω

= 8Ω

= 4Ω

L

Ω

Ω

(Notes 6, 7)

= 8Ω

= 8Ω

L

80

90
100
125

0.015

0.1 %

102 dB

83 dB

18.1 V/V

0.5 dB

92

60

88

0.015

87

4.59

4.61
45

%

0.05 %

0.10 %

87 %

104 dB

150
235

W
W

W
W

%

%

%

A
A

mA

V

µ

W
W

V

µ

4 of 27 TA2022, Rev. 0.90, 12.00

TECHNICAL INFORMATION

Note 6: Minimum and maximum limits are guaranteed but may not be 100% tested.
Note 7: For operation in ambient temperatures greater than 25°C, the device must be derated based on the

maximum junction temperature and the thermal resistance determined by the mounting technique.
Note 8: This specification includes the current draw from the internal buck regulator.
Note 9: This specification includes the current draw from both the TA2022 and the external feedback biasing.
Note 10: This is the current draw of the VN10 pin if an external “floating” 11V supply is used instead of the

internal buck regulator. If an external floating supply is used, the idle current draw of the VNN supply
will be approximately 20mA.

Note 11: These supply voltages are calculated using the IVPPSENSE AND IVNNSENSE values shown in the

Electrical Characteristics table. The typical voltage values shown are calculated using a
RVPPSENSE and RVNNSENSE value of 249kohm without any tolerance variation. The minimum
and maximum voltage limits shown include either a +1% or –1% (+1% for Over-voltage turn on and
Under-voltage turn off, -1% for Over-voltage turn off and Under-voltage turn on) variation of
RVPPSENSE or RVNNSENSE off the nominal 249kohm value. These voltage specifications are
examples to show both typical and worst case voltage ranges for a given RVPPSENSE and
RVNNSENSE resistor value of 249kohm. Please refer to the Application Information section for a
more detailed description of how to calculate the over and under voltage trip voltages for a given
resistor value.

Note 12: The supply voltage limitation for 4 ohm single ended (+/-31V), or 8 ohm bridged (+/-30V), is based on

the current limit protection circuitry. The current limit circuitry may be activated during large output
excursions if the recommended supply voltage ranges are exceeded. This will result in the amplifier
being muted.

TA2022, Rev. 0.90, 12.00 5 of 27

TECHNICAL INFORMATION

Pin Description

Pin

Function

1, 13 VBOOT2, VBOOT1 Bootstrap voltages for gate drive of high side MOSFET’s

2 VN10 “Floating” supply input. Normally connected to the output of onboard VN10 buck

3 VN10GND Power ground for onboard VN10 generator. Electrically tied to the TA2022 case.

4, 12 VPP2, VPP1 Positive power supply input pins.

5 VN10SW Switching output voltage for onboard VN10 generator (buck converter).
6 NC Not connected internally. May be connected to pin 7 without any loss of

7,10 OUT2, OUT1 Power amplifier outputs.

8, 9 VNN2, VNN1 Negative power supply inputs.

11 NC Not connected internally. May be connected to pin 10 without any loss of

14 VN10FDBK Feedback for onboard VN10 generator (nominally 11V above VNN)
15, 20 AGND Analog Ground.
16, 21 V5 5V power supply input.

17 REF Used to set internal bias. Typically 1.1V

18 VNNSENSE Negative supply voltage sense input.

19 VPPSENSE Positive supply voltage sense input.
22, 25 OAOUT1, OAOUT2 Outputs of Input Stage op amps.
23, 26 INV1, INV2 Inverting inputs of Input Stage op amps.

24 MUTE Logic input. A logic high puts the amplifier in mute mode. Ground if not used.

27 BIASCAP Bandgap reference times two (typically 2.5VDC).
28, 29 FBKGND2, FBKOUT2 Output voltage differential feedback for channel 2.

30,31 FBKGND1, FBKOUT1 Output voltage differential feedback for channel 1.

32 HMUTE Logic Output. A logic high indicates both amplifiers are muted, due to the mute

Description

converter. This voltage must be stable and referenced to VNN.

functionality or performance.

functionality or performance.

pin state, or a “fault” such as an overcurrent, undervoltage, or overvoltage
condition.

32-pin SSIP Package

(Front View)

VBOOT2

VN10

VN10GND

VPP2

VN10SW

OUT2

VNN2
VNN1

OUT1

VPP1

VBOOT1

VN10FDBK

AGND

REF
VNNSENSE
VPPSENSE

AGND

OAOUT1

INV1

MUTE

OAOUT2

INV2

BIASCAP
FBKGND2

FBKOUT2
FBKGND1
FBKOUT1

HMUTE

NC

NC

V5

V5

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

6 of 27 TA2022, Rev. 0.90, 12.00

TECHNICAL INFORMATION

Application / Test Diagram

D

11DQ09

OUT1

D

O

MUR120

C

FB

390pF

AGND (Pin 20)

11DQ09

OUT2

D

O

MUR120

C

FB

560pF

AGND (Pin 20)

C

SW

0.1uF,35V

D

SW

11DQ09

C

SWFB

0.1uF,50V

C

HBR

0.1uF,100V

C

HBR

0.1uF,100V

B

RB 250

C

B

0.1uF

V5 (Pin 21)

R

FBA

1K

R

FBB

1.1K

D

B

RB 250

C

B

0.1uF

V5 (Pin 21)

R

FBA

1K

R

FBB

1.1K

100uH, 1A

R

SWFB

1K

Ω

Ω

Ω

L

VN10

+

Ω

VN10

Ω

+

C

Ω

SW

Ω

C

BAUX

47uF

R

FBA

1K

Ω

R

9.1K

R

FBB

1.1K

Ω

BAUX

47uF

R

FBA

1K

Ω

R

9.1K

R

FBB

1.1K

Ω

+

VNN

C

S

0.1uF, 50V

C

S

0.1uF, 50V

FBC

Ω

FBC

Ω

R

9.1K

C

SW

100uF, 35V

C

3.3uF

3.3uF

VNN

VPP

I

+

C

(Pin 20)

I

+

(Pin 20)

R
20K

R

REF

8.25K

R

VNNSENSE

R

VPPSENSE

R
20K

I

5V

I

C

0.1uF

Ω

Ω, 1%

20K

Ω

A

5V

(Pin 20)

R

20K

0.1uF

0.1uF

OAOUT1

R

F

Ω

BIASCAP

OAOUT2

F

Ω

C

S

C

249K

249K

S

INV1

MUTE

INV2

REF

Ω, 1%

Ω, 1%

22

23

2.5V

27

24

25

26

17

21

20

16

15

18

19

6

11

V5

-

+

AGND

200K

Ω

V5

V5

-

+

AGND

V5

AGND

V5

AGND

VNNSENSE

VPPSENSE

NC

NC

TA2022

Processing

&

Modulation

Processing

&

Modulation

VN10

VN10

VN10

Generator

VPP1

VNN1

VNN2

VPP2

VPP1

VNN1

VPP2

VNN2

13

10

31
30

32

1

7

29

28

2

3

5

14

12

9

8

4

VBOOT1

VNN1

(Pin 9)

FBKOUT1

FBKGND1

HMUTE

VBOOT2

VNN2

(Pin 8)

FBKOUT2

FBKGND2

VN10

VNN

VN10GND

VN10SW

VNN

VN10FBK

VNN

L

O

10uH, 10A

0.22uF

R

FBC

9.1K

Ω

V5 (Pin 21)

R

OFA

50K

Ω

AGND (Pin 20)

L

O

10uH, 10A

0.22uF

FBC

Ω

V5 (Pin 21)

R

50K

AGND (Pin 20)

VN10

+

C

S

100uF, 50V

+

C

S

100uF, 50V

VPP

VNN

C

O

R

Z

6.2

2W

Ω,

C

Z

0.22uF

R

OFB

10K

Ω

to FBKGND1
(Pin30)

Offset Trim

Circuit

C

R

O

Z

6.2

Ω,

C

Z

0.22uF

R

OFB

10K

OFA

Ω

Ω

2W

4Ω or 8

to FBKGND2
(Pin28)

Offset Trim

Circuit

R

4Ω or 8

R

L

Ω

L

Ω

Analog Ground

Power Ground

TA2022, Rev. 0.90, 12.00 7 of 27

g

TECHNICAL INFORMATION

External Components Description

Components Description
R

Inverting input resistance to provide AC gain in conjunction with RF. This input is

I

RF Feedback resistor to set AC gain in conjunction with RI. Please refer to the Amplifier

CI AC input coupling capacitor which, in conjunction with RI, forms a highpass filter at

R

FBA

R

Feedback divider resistor connected to AGND. This value of this resistor depends

FBB

R

Feedback resistor connected from either the OUT1(2) to FBKOUT1(2) or speaker

FBC

CFB Feedback delay capacitor that both lowers the idle switching frequency and filters

R

Potentiometer used to manually trim the DC offset on the output of the TA2022.

OFA

R

Resistor that limits the manual DC offset trim range and allows for more precise

OFB

R

Bias resistor. Locate close to pin 17 and ground at pin 20.

REF

CA BIASCAP decoupling capacitor. Should be located close to pin 27 and grounded at

CB High frequency bootstrap capacitor, which filters the high side gate drive supply.

C

Bulk bootstrap capacitor that supplements C

BAUX

RB Bootstrap resistor that limits C

DB Bootstrap diode that charges CB, and C
CSW VN10 generator filter capacitors. The high frequency capacitor (0.1uF) must be

LSW VN10 generator filter inductor. This inductor should be sized appropriately so that

D

Flywheel diode for the internal VN10 buck converter. This diode also prevents

SW

C

VN10

SWFB

biased at the BIASCAP voltage (approximately 2.4VDC).

Gain paragraph, in the Application Information section.

)CR2(1f

π=

IIC

Feedback divider resistor connected to V5. This resistor is normally set at 1kΩ.

on the supply voltage setting and helps set the TA2022 gain in conjunction with R
R

F, RFBA,

and R

. Please see the Modulator Feedback Design paragraphs in the

FBC

Application Information Section.

ground to FBKGND1(2). The value of this resistor depends on the supply voltage
setting and helps set the TA2022 gain in conjunction with R
should be noted that the resistor from OUT1(2) to FBKOUT1(2) must have a power
rating of greater than

Design paragraphs in the Application Information Section.

very high frequency noise from the feedback signal, which improves amplifier
performance. The value of C
so that the idle switching difference is greater than 40kHz. Please refer to the
Application / Test Circuit.

adjustment.

pin 20.

This capacitor must be located as close to pin 13 (VBOOT1) or pin1 (VBOOT2) for
reliable operation. The “negative” side of C
(pin 10) or OUT2 (pin 7). Please refer to the Application / Test Circuit.

in a reduction in the average switching frequency.

(bootstrap supply charging).

located close to pin 2 (VN10) to maximize device performance. The bulk capacitor
(100uF) should be sized appropriately such that the VN10 voltage does not
overshoot with respect to VNN during TA2022 turn on.

L

does not saturate, and VN10 does not overshoot with respect to VNN during

SW

TA2022 turn on.

VN10SW from going more than one diode drop negative with respect to VNN.

enerator feedback capacitor. This capacitor, in conjunction with R

(Refer to the Application/Test Circuit)

DISS

2

=

should be offset between channel 1 and channel 2

FB

BAUX

. Please see the Modulator Feedback

)(2RVPPP

FBC

should be connected directly to OUT1

B

during “clipping” events, which result

B

charging current during TA2022 power up

via RB, when the output is low (at VNN).

BAUX

I, RF, RFBA,

, and R

SWFB

. It

FBB

, filters

I,

8 of 27 TA2022, Rev. 0.90, 12.00

TECHNICAL INFORMATION

the VN10 feedback signal such that the loop is unconditionally stable.

R

VN10 generator feedback resistor. This resistor sets the nominal VN10 voltage.

SWFB

With R

equal to 1kΩ, the internally VN10 voltage will typically be 11V above

SWFB

VNN.

CS Supply decoupling for the power supply pins. For optimum performance, these

components should be located close to the TA2022 and returned to their respective
ground as shown in the Application/Test Circuit.

R

VNNSNESE

Overvoltage and undervoltage sense resistor for the negative supply (VNN). Please

refer to the Electrical Characteristics Section for the trip points as well as the
hysteresis band.

R

VPPSENSE

Overvoltage and undervoltage sense resistor for the positive supply (VPP). Please

refer to the Electrical Characteristics Section for the trip points as well as the
hysteresis band.

C

Supply decoupling for the high current Half-bridge supply pins. These components

HBR

must be located as close to the device as possible to minimize supply overshoot and
maximize device reliability. These capacitors should have good high frequency
performance including low ESR and low ESL. In addition, the capacitor rating must
be twice the maximum VPP voltage.

CZ Zobel capacitor, which in conjunction with RZ, terminates the output filter at high

frequencies. Use a high quality film capacitor capable of sustaining the ripple current
caused by the switching outputs.

RZ Zobel resistor, which in conjunction with CZ, terminates the output filter at high

frequencies. The combination of R

and CZ minimizes peaking of the output filter

Z

under both no load conditions or with real world loads, including loudspeakers which
usually exhibit a rising impedance with increasing frequency. Depending on the
program material, the power rating of R

may need to be adjusted. The typical

Z

power rating is 2 watts.

DO Fast Recovery diodes that minimize undershoots of the outputs with respect to

power ground during switching transitions as well as output shorts to ground. For
maximum effectiveness, these diodes must be located close to the output pins and
returned to their respective VNN. Please see Application/Test Circuit for VNN return
pin.

LO Output inductor, which in conjunction with CO, demodulates (filters) the switching

waveform into an audio signal. Forms a second order filter with a cutoff frequency
of and a quality factor of

C

O

Output capacitor, which, in conjunction with L
waveform into an audio signal. Forms a second order low-pass filter with a cutoff

frequency of

=

and a quality factor of

π=

)CL2(1f

OOC

.

CLCRQ

OOOL

, demodulates (filters) the switching

O

=

.

Use

CLCRQ

OOOL

a high quality film capacitor capable of sustaining the ripple current caused by the
switching outputs

TA2022, Rev. 0.90, 12.00 9 of 27