Texas Instruments TPA2000D1, TPA2000D1-Q1 Schematic [ru]

TPA2000D1-Q1

2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER

SGLS137 – SEPTEMBER 2002

D Qualification in Accordance With

AEC-Q100

†

D Qualified for Automotive Applications
D Customer-Specific Configuration Control

Can Be Supported Along With
Major-Change Approval

D ESD Protection Exceeds 2000 V Per

MIL-STD-883, Method 3015; Exceeds 200 V

D 4 mm × 4 mm MicroStar Junior BGA and

TSSOP Package Options

D 2 W Into a 4-Ω Speaker (THD+N<1%)
D <0.2% THD+N at 1.5 W, 1 kHz, Into a 4-Ω

Load

D Integrated Depop Circuitry
D Short-Circuit Protection (Short to Battery,

Ground, and Load)

Using Machine Model (C = 200 pF, R = 0)

D Modulation Scheme Optimized to Operate

Without a Filter

PW PACKAGE

(TOP VIEW)

D Extremely Efficient Third Generation 5-V

Class-D Technology:
– Low-Supply Current (No Filter) ...4 mA
– Low-Supply Current (Filter) . . . 7.5 mA
– Low-Shutdown Current . . . 0.05 µA
– Low-Noise Floor ...40 µV

RMS

(No-Weighting Filter)

– Maximum Efficiency Into 8 Ω, 75 – 85 %
– 4 Internal Gain Settings ...6 – 23.5 dB

INP
INN

SHUTDOWN

GAIN0
GAIN1

PV

DD

OUTP

PGND

1
2
3
4
5
6
7
8

– PSSR . . . –77 dB

†

Contact factory for details. Q100 qualification data available on
request.

description

The TP A2000D1 is a 2-W mono bridge-tied-load (BTL) class-D amplifier designed to drive a speaker with at least
4-Ω impedance. The amplifier uses TI’s third generation modulation technique, which results in improved efficiency
and SNR. It also allows the device to be connected directly to the speaker without the use of the LC output filter
commonly associated with class-D amplifiers (this will result in EMI which must be shielded at the system level).
These features make the device ideal for use in devices where high-efficiency is needed to extend battery run time.

16
15
14
13
12
11
10

9

BYPASS
AGND
COSC
ROSC
V

DD

PV

DD

OUTN
PGND

The gain of the amplifier is controlled by two input terminals, GAIN1, and GAIN0. This allows the amplifier to be
configured for a gain of 6, 12, 18, and 23.5 dB. The differential input terminals are high-impedance CMOS inputs,
and can be used as summing nodes.

The class-D BTL amplifier includes depop circuitry to reduce the amount of turnon pop at power up, and when
cycling SHUTDOWN

.

The TPA2000D1 is available in the 16-pin TSSOP and MicroStar Junior BGA packages that will drive 2 W of
continuous output power into a 4-Ω load. TPA2000D1T operates over an ambient temperature range of –40°C to
105°C.

ORDERING INFORMATION

T

A

–40°C to 105°C TSSOP (PW) Tape and Reel TPA2000D1TPWRQ1 20001T

‡

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

PACKAGE

‡

ORDERABLE

PART NUMBER

TOP-SIDE
MARKING

Copyright  2002, Texas Instruments Incorporated

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1

TPA2000D1-Q1
2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER

SGLS137 – SEPTEMBER 2002

functional block diagram

DD

V

DD

AGNDV

PV

DD

INN

INP

SHUTDOWN

GAIN1
GAIN0

COSC
ROSC

BYPASS

SD

Gain

2

Gain

Adjust

_

+

_

+

Gain

Adjust

Biases

and

References

_
+

+
_

Ramp
Generator

+
_

_
+

Deglitch

Logic

Deglitch

Logic

Thermal VDD ok

Terminal Functions

TERMINAL

NAME

NO.

GQC PW

A3 – A5,

AGND

B2 – B6
C2 – C6
D2 – D4

BYPASS A6 16 I Connect capacitor to ground for BYPASS voltage filtering.
COSC B7 14 I Connect capacitor to ground to set oscillation frequency.
GAIN0 C1 4 I Bit 0 of gain control (TTL logic level)
GAIN1 D1 5 I Bit 1 of gain control (TTL logic level)

INN A1 2 I Negative differential input
INP A2 1 I Positive differential input
OUTN G7 10 O Negative BTL output
OUTP G1 7 O Positive BTL output

D5, D6

PGND

E2 – E6

F2 – F6

8, 9 I High-current grounds

G2 – G6

PV

DD

E1, E7,

F1, F7

6, 11 I High-current power supplies
ROSC C7 13 I Connect resistor to ground to set oscillation frequency.
SHUTDOWN B1 3 I
V

DD

D7 12 I Analog power supply

I/O DESCRIPTION

15 I Analog ground

Places the amplifier in shutdown mode if a TTL logic low is placed on this terminal, and normal operation
if a TTL logic high is placed on this terminal.

Drive

Drive

Start-Up

Protection

Logic

Gate

Gate

OC

Detect

OUTN

PGND
PV

DD

OUTP

PGND

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPA2000D1-Q1

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2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER

SGLS137 – SEPTEMBER 2002

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, V
Input voltage, V

PVDD –0.3 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DD,

–0.3 V to VDD +0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

{

Continuous total power dissipation (see Dissipation Rating Table). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T
Operating junction temperature range, T
Storage temperature range, T

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

–40°C to 105°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A

–40°C to 115°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

J

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

{

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C DERATING FACTOR TA = 70°C TA = 85°C TA = 105°C

PW 774 mW 6.19 mW/°C 495 mW 402 mW 279 mW

recommended operating conditions

MIN MAX UNIT

Supply voltage, V
High-level input voltage, V
Low-level input voltage, V
Operating free-air temperature, T

DD,

PV

DD

IH

IL

2.7

5.5
GAIN0, GAIN1, SHUTDOWN
GAIN0, GAIN1, SHUTDOWN

A

–40

2

0.7

105

V
V
V

°C

electrical characteristics at specified free-air temperature, PVDD = 5 V, TA = 25°C (unless otherwise
noted)

PARAMETER TEST CONDITIONS

|VOS|
PSRR
|IIH|
|IIL|
I

DD

I

DD(SD)

Output offset voltage (measured differentially)
Power supply rejection ratio
High-level input current
Low-level input current
Supply current, no filter (with or without speaker load)
Supply current, shutdown mode

operating characteristics, PVDD = 5 V, T

PARAMETER TEST CONDITIONS

P

O

THD + N
B

OM

k

SVR

SNR
V

n

Z

i

Output power
Total harmonic distortion plus noise
Maximum output power bandwidth
Supply ripple rejection ratio
Signal-to-noise ratio
Output noise voltage (no-noise weighting filter)

Input impedance

= 25°C, R

A

VI = 0 V, AV = any gain
PVDD = 4.9 V to 5.1 V
PVDD = 5.5, VI = PV

DD

PVDD = 5.5, VI = 0 V

GAIN0, GAIN1, SHUTDOWN = 0 V

= 4 Ω, gain = 6 dB (unless otherwise noted)

L

THD = 1%,
PO = 1.5 W,

f = 1 kHz,

f = 20 Hz to 20 kHz
THD = 1%,
f = 1 kHz,

C

= 1 µF,

BYP

C

= 1 µF

BYP

f = <10 Hz to 22 kHz

MIN TYP MAX UNIT

25

mV

77

4

0.05

28

dB

1

µA

1

µA

7

mA

µA

MIN TYP MAX UNIT

2

W

<0.2%

20
71
95
40

>15

kHz

dB
dB

µV(rms)

kΩ

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

TPA2000D1-Q1

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2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER

SGLS137 – SEPTEMBER 2002

electrical characteristics at specified free-air temperature, PVDD = 3.3 V , TA = 25°C (unless otherwise
noted)

|VOS|
PSRR
|IIH|
|IIL|

I

DD

I

DD(SD)

PARAMETER TEST CONDITIONS

Output offset voltage (measured differentially)
Power supply rejection ratio
High-level input current
Low-level input current
Supply current, no filter (with or without speaker

load)
Supply current, shutdown mode

VI = 0 V, AV = any gain
PVDD = 3.2 V to 3.4 V
PVDD = 3.3, VI = PV

DD

PVDD = 3.3, VI = 0 V

MIN TYP MAX UNIT

25

mV

61

4

0.05

28

dB

1

µA

1

µA

7

mA

µA

operating characteristics, PVDD = 3.3 V, T

PARAMETER TEST CONDITIONS

P

O

THD + N
B

OM

k

SVR

SNR
V

n

Z

i

Output power
Total harmonic distortion plus noise
Maximum output power bandwidth
Supply ripple rejection ratio
Signal-to-noise ratio
Output noise voltage (no-noise weighting filter)

Input impedance

= 25°C, R

A

THD = 1%,
PO = 55 mW,
THD = 0.7%
f = 1 kHz,

C

BYP

= 4 Ω, gain = 6 dB (unless otherwise noted)

L

MIN TYP MAX UNIT

f = 1 kHz

f = 20 Hz to 20 kHz

850

<0.2%

20

C

BYP

= 1 µF

61
93

= 1 µF,

f = <10 Hz to 22 kHz

40

>15

mW

kHz

dB
dB

µV(rms)

kΩ

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

TPA2000D1-Q1

2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER

SGLS137 – SEPTEMBER 2002

APPLICATION INFORMATION

eliminating the output filter with the TPA2000D1

This section will focus on why the user can eliminate the output filter with the TPA2000D1.

effect on audio

The class-D amplifier outputs a pulse-width modulated (PWM) square wave, which is the sum of the switching
waveform and the amplified input audio signal. The human ear acts as a band-pass filter such that only the
frequencies between approximately 20 Hz and 20 kHz are passed. The switching frequency components are much
greater than 20 kHz, so the only signal heard is the amplified input audio signal.

traditional class-D modulation scheme

The traditional class-D modulation scheme, which is used in the TP A005Dxx family , has a differential output where
each output is 180 degrees out of phase and changes from ground to the supply voltage, V
differential pre-filtered output varies between positive and negative V

, where filtered 50% duty cycle yields 0 V

DD

across the load. The traditional class-D modulation scheme with voltage and current waveforms is shown in Figure

1. Note that even at an average of 0 V across the load (50% duty cycle), the current to the load is high, causing high
loss, thus causing a high supply current.

. Therefore, the

DD

OUTP

OUTN

+5 V

Differential Voltage

Across Load

O V

–5 V

Current

Figure 1. Traditional Class-D Modulation Scheme’s Output Voltage and Current Waveforms Into an Inductive

Load With No Input

TPA2000D1 modulation scheme

The TPA2000D1 uses a modulation scheme that still has each output switching from 0 to the supply voltage.
However, OUTP and OUTN are now in phase with each other with no input. The duty cycle of OUTP is greater than
50% and OUTN is less than 50% for positive voltages. The duty cycle of OUTP is less than 50% and OUTN is greater
than 50% for negative voltages. The voltage across the load sits at 0 V throughout most of the switching period
greatly reducing the switching current, which reduces any I

2

R losses in the load.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5