NXP Semiconductors TFA9810 User Manual

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TFA9810

Stereo full-bridge audio amplifier 2 x 12 W

Rev. 03 — 20 February 2008

Product data sheet

1. General description

The TFA9810 is a two-channel power comparator for high-efficiency class D audio amplifier systems. It contains two full-bridge Bridge-Tied Load (BTL) power stages, drive logic, protection control logic and full differential input comparators. By using this power comparator a compact closed-loop self-oscillating digital amplifier system or open-loop system can be built. The TFA9810 does not require a heat sink and operates using an asymmetrical supply voltage.

2. Features

nStereo full-bridge power comparator for class D audio amplifier applications

nNo external heat sink required

nOperating voltage range: asymmetrical from 8 V to 20 V

nThermally protected

nZero dead-time switching

nCurrent-limiting (no audible interruptions)

3.Applications

nSelf-oscillating or open-loop class D audio amplifier applications

nFlat-panel television sets

nFlat-panel monitors

nMultimedia systems

nWireless speakers

nHigh-end CRT television sets

4.Quick reference data

Table 1. Quick reference data

Tamb = 25 °C; VP = 12 V; fosc = 550 kHz; Figure 33 unless otherwise specified

Symbol

Parameter

Condition

Min

Typ

Max

Unit

VP

supply voltage

VP = VDDPx VSSPx

8

12

20

V

Ioff

off-state current

off mode

-

110

200

μA

Iq

quiescent current

with load, filter and

-

35

45

mA

 

 

snubbers connected

 

 

 

 

 

 

 

 

 

 

 

ηpo

output power

output power

87

89

-

%

 

efficiency

2 x 9 W into 8 Ω;

 

 

 

 

Po = Po(nom)

NXP Semiconductors

 

 

 

TFA9810

 

 

 

 

 

Audio amplifier 2 x 12 W

 

 

Table 1.

Quick reference data …continued

 

 

 

 

 

 

 

Tamb = 25 °C; VP = 12 V; fosc = 550 kHz; Figure 33 unless otherwise specified

 

 

 

 

 

Symbol

Parameter

Condition

Min

Typ

Max

Unit

 

 

Po(RMS)

RMS output power

RL = 8 Ω; VP = 12 V;

-

9.5

-

 

W

 

 

 

 

THD = 10 %; Two channel

 

 

 

 

 

 

 

 

 

driven; no heat sink

 

 

 

 

 

 

 

 

 

required.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Po

output power

VP = 12 V; RL = 8 Ω

-

-

-

 

-

 

 

 

 

THD = 10 %

8.5

9.5

-

 

W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

THD = 1 %

6.5

7.5

-

 

W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VP = 14 V; RL = 8 Ω;

-

15

-

 

W

 

 

 

 

THD = 10 %; thermally

 

 

 

 

 

 

 

 

 

limited

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VP = 16 V; RL = 8 Ω;

-

15

-

 

W

 

 

 

 

THD = 10 %; thermally

 

 

 

 

 

 

 

 

 

limited

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VP = 12 V; RL = 6 Ω;

-

12

-

 

W

 

 

 

 

THD = 10 %; thermally

 

 

 

 

 

 

 

 

 

limited

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VP = 12 V; RL = 4 Ω;

-

15

-

 

W

 

 

 

 

THD = 10 %; thermally

 

 

 

 

 

 

 

 

 

limited

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5. Ordering information

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 2. Ordering information

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type number

Package

 

 

 

 

 

 

 

 

Name

Description

 

 

 

 

Version

TFA9810T

SO32

SO32: plastic small outline package; 32 leads; body width 7.5 mm

 

 

SOT287-1

 

 

 

 

 

 

 

 

 

 

TFA9810_3

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 20 February 2008

2 of 29

NXP Semiconductors

TFA9810

 

Audio amplifier 2 x 12 W

6. Block diagram

 

 

TFA9810

 

 

 

 

 

27

BOOT1P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

VDDP1

 

 

 

 

 

 

 

DRIVER

 

 

 

 

 

 

 

 

 

HIGH

 

 

 

 

 

 

CONTROL

 

 

 

26

OUT1P

 

 

 

 

 

 

 

 

 

VDDA1

4

 

 

LOGIC

 

 

 

 

 

 

 

 

 

 

DRIVER

 

 

 

 

 

 

 

 

 

 

 

IN1P

2

 

 

 

 

 

LOW

30

VSSP1

 

 

 

 

 

 

IN1N

3

 

COMPARATOR 1

 

 

 

STABI1

 

 

 

 

 

 

 

 

 

29

BOOT1N

 

 

 

 

 

 

 

 

VSSA1

5

 

 

 

 

 

 

VDDP1

 

 

 

 

 

 

 

 

DRIVER

 

 

DIAG

10

 

 

 

 

 

HIGH

 

 

PROTECTION

 

 

 

 

 

 

 

 

CONTROL

 

 

 

28

OUT1N

 

 

OVP

 

LOGIC

 

 

 

 

 

 

 

UVP

 

 

 

 

DRIVER

 

 

 

 

OCP

 

 

 

 

 

 

 

 

 

 

 

 

LOW

 

 

 

 

OTP

 

 

 

 

VSSP1

 

 

 

 

 

 

 

 

 

TEST

11

ODP

 

 

 

 

 

31

STAB1

WP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SO/OL

6

 

 

 

 

 

 

 

 

 

 

REFERENCE

 

 

 

 

22

BOOT2P

ENABLE

7

 

 

 

 

 

 

24

VDDP2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DRIVER

 

 

CDELAY

8

 

 

 

 

 

HIGH

 

 

 

 

 

 

CONTROL

 

 

 

23

OUT2P

 

 

 

 

LOGIC

 

 

 

 

 

VDDA2

13

 

 

 

 

 

DRIVER

 

 

 

 

 

 

 

LOW

19

VSSP2

 

 

 

 

 

 

 

 

IN2P

15

 

 

 

 

 

 

 

 

IN2N

14

 

COMPARATOR 2

 

 

 

STABI2

20

BOOT2N

 

 

 

 

 

 

 

 

 

 

 

 

 

VDDP2

 

VSSA2

12

 

 

 

 

 

DRIVER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HIGH

 

 

 

 

 

 

CONTROL

 

 

 

21

OUT2N

 

 

 

 

 

 

 

 

 

 

 

 

 

LOGIC

 

 

 

 

 

 

 

 

 

 

 

 

DRIVER

 

 

 

 

 

 

 

 

 

LOW

VSSP2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18

STAB2

 

 

 

 

HEATSPREADER

 

 

 

 

 

 

1

16

17

32

9

 

 

 

 

 

 

 

VSSD(HW)

n.c.

010aaa016

 

 

 

 

 

 

 

 

Fig 1. Block diagram

TFA9810_3

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 20 February 2008

3 of 29

NXP Semiconductors

TFA9810

 

Audio amplifier 2 x 12 W

7.Pinning information

7.1Pinning

VSSD(HW)

1

 

32

VSSD(HW)

 

 

 

 

 

IN1P

2

 

31

STAB1

 

 

 

 

 

IN1N

3

 

30

VSSP1

 

 

 

 

 

VDDA1

4

 

29

BOOT1N

 

 

 

 

 

VSSA1

5

 

28

OUT1N

 

 

 

 

 

SO/OL

6

 

27

BOOT1P

 

 

 

 

 

ENABLE

7

 

26

OUT1P

 

 

 

 

 

CDELAY

8

TFA9810

25

VDDP1

 

 

 

 

n.c.

9

SO32

24

VDDP2

 

 

 

DIAG

10

 

23

OUT2P

 

 

 

 

 

TEST

11

 

22

BOOT2P

 

 

 

 

 

VSSA2

12

 

21

OUT2N

 

 

 

 

 

VDDA2

13

 

20

BOOT2N

 

 

 

 

 

IN2N

14

 

19

VSSP2

 

 

 

 

 

IN2P

15

 

18

STAB2

 

 

 

 

 

VSSD(HW)

16

 

17

VSSD(HW)

 

 

010aaa017

 

 

Fig 2. Pin configuration

The SO32 package has four corner leads. These leads (1, 16, 17, and 32) are internally connected to the die pad and must be connected to VSSA in the application. Together with the applied copper area on the Printed Circuit Board (PCB) these leads determine the ambient temperature, which affects the thermal resistance of the junction.

7.2 Pin description

 

Table 3.

Pin description

 

 

Symbol

Pin

Description

 

VSSD(HW)

1, 16, 17, Negative digital supply voltage and handle wafer

 

 

32

 

 

 

 

 

 

IN1P

2

Positive input comparator channel 1

 

 

 

 

 

IN1N

3

Negative input comparator channel 1

 

 

 

 

 

VDDA1

4

Positive analog supply voltage channel 1

 

VSSA1

5

Negative analog supply voltage channel 1

 

SO/OL

6

SO/OL input enables self-oscillating / open-loop configuration

 

 

 

 

 

ENABLE

7

Enable input to switch between SLEEP and OPERATING

 

 

 

 

 

CDELAY

8

CDELAY input determines the switch on/off timing

 

 

 

 

 

n.c.

9

Not connected

 

 

 

 

 

DIAG

10

Diagnostic output; open drain

 

 

 

 

 

TEST

11

Test signal input; for testing purposes only

 

 

 

 

 

VSSA2

12

Negative analog supply voltage channel 2

 

VDDA2

13

Positive analog supply voltage channel 2

TFA9810_3

 

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 20 February 2008

4 of 29

NXP Semiconductors

 

TFA9810

 

 

 

Audio amplifier 2 x 12 W

 

Table 3.

Pin description …continued

 

 

 

 

 

Symbol

Pin

Description

 

IN2N

14

Negative input comparator channel 2

 

 

 

 

 

IN2P

15

Positive input comparator channel 2

 

 

 

 

 

STAB2

18

Decoupling of internal 11 V regulator for channel 2 drivers

 

 

 

 

 

VSSP2

19

Negative power-supply voltage channel 2

 

BOOT2N

20

Bootstrap high-side driver negative output channel 2

 

 

 

 

 

OUT2N

21

Negative output channel 2

 

 

 

 

 

BOOT2P

22

Bootstrap high-side driver positive output channel 2

 

 

 

 

 

OUT2P

23

Positive output channel 2

 

 

 

 

 

VDDP2

24

Positive supply voltage power channel 2

 

VDDP1

25

Positive power supply voltage channel 1

 

OUT1P

26

Positive output channel 1

 

 

 

 

 

BOOT1P

27

Bootstrap high-side driver positive output channel 1

 

 

 

 

 

OUT1N

28

Negative output channel 1

 

 

 

 

 

BOOT1N

29

Bootstrap high-side driver negative output channel 1

 

 

 

 

 

VSSP1

30

Negative supply voltage power channel 1

 

STAB1

31

Decoupling of internal 11 V regulator for channel 1 drivers

 

 

 

 

8.Functional description

8.1General

The TFA9810 is a dual-switching power comparator. It is the main building block for a stereo high-efficiency Class D audio power amplifier system. It contains two full-bridge BTL power stages, drive logic, protection-control logic and full differential input comparators and references (see Figure 1). By using this power comparator a compact closed-loop self-oscillating digital amplifier system or open-loop system can be built. A second-order low-pass filter converts the Pulse Width Modulation (PWM) output signal into an analog audio signal across the speaker.

8.2 Interfacing

The pins ENABLE and SO/OL control the operating mode of the TFA9810. Both the

ENABLE and the SO/OL pins refer to VSSD(HW).

When the SO/OL pin is connected to VSSA the TFA9810 is in self-oscillating mode: when the SO/OL pin is floating the TFA9810 is in open-loop mode.

The TEST pin needs to be connected to VDDA in both situations.

Table 4. SO/OL connections

Interfacing

 

SO/OL connected to

Configuration

VSSD(HW)

Self-oscillating

Open

Open-loop

 

 

The device has two modes: SLEEP and OPERATING.

TFA9810_3

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 20 February 2008

5 of 29

NXP Semiconductors

TFA9810

 

Audio amplifier 2 x 12 W

In SLEEP mode the TFA9810 is not biased and has a very low supply current.

When the TFA9810 is set to OPERATING mode the device is started via the start-up sequence, which provides a pop-free start-up behavior. After start-up the reference voltages STAB are present and the outputs start switching.

Table 5. Start-up

Interfacing

 

ENABLE [V]

Mode

ENABLE < 0.8 V

SLEEP

 

 

ENABLE > 3 V

OPERATING

 

 

8.3 Input comparators

The input stages have a differential input and are optimized for low noise and low offset. This results in maximum flexibility in the application.

8.3.1Operating in self-oscillating configuration

The inputs (IN1P, IN1N, IN2P, IN2N) of the comparators are internally set to a voltage level

of 0.5VP, but only during the start-up sequence. In operating mode the inputs are high-ohmic.

8.3.2Operating in open-loop configuration

No internal voltages are applied to the inputs. The input pins (IN1P, IN1N, IN2P, IN2N) are pulled down to VSSA level by internal resistors.

8.4Diagnostic

The DIAG output is an open-drain output. The maximum current is 2 mA. Whenever one of the protections is triggered the DIAG output is activated low. The DIAG output refers to

VSSD.

8.5 Protections

Overtemperature, overcurrent, overvoltage, undervoltage, overdissipation sensors, and window protection are included in the TFA9810. When one of these sensors exceeds its threshold level either the output power stage is switched off and the outputs (OUT1N, OUT1P, OUT2N, OUT2P) become floating, or the TFA9810 shuts down and starts up immediately.

OverTemperature Protection (OTP)

If the junction temperature (Tj) exceeds a threshold level of about 150 °C then the outputs become floating. The device will start switching again after 5 μs and when the temperature is below 150 °C. This is thermal limitation without audible interruptions.

OverCurrent Protection (OCP)

If the output current exceeds the maximum output current threshold level the output becomes floating. The device will start switching again after 5 μs. This is current limitation without audible interruptions.

TFA9810_3

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 20 February 2008

6 of 29

NXP Semiconductors

TFA9810

 

Audio amplifier 2 x 12 W

OverVoltage Protection (OVP)

When the supply voltage applied to the TFA9810 exceeds the maximum supply voltage threshold level the device will shut down. The device will restart when the supply voltage is within the operating range.

UnderVoltage Protection (UVP)

When the supply voltage applied to the TFA9810 falls below the minimum supply voltage threshold level the device will shut down. The device will restart when the supply voltage is within the operating range.

OverDissipation Protection (ODP)

The ODP in the TFA9810 is a combination of two protections. Exceeding a temperature threshold level of 135 °C an internal pre-warning is generated. When an overcurrent is detected during the pre-warning the device will shut down. When the

ENABLE pin is high the TFA9810 will restart automatically. The restart sequence (switch-off switch-on) will take 200 ms to 500 ms.

Window Protection (WP)

During start-up, if one of the outputs is shorted to VSS or VDD the device will not start. This is an effective measure to protect the device against shorts between the outputs (before the filter) and the ground or supply lines. The supply must be switched off prior to removing any short. The WP protects the device against failure during board assembly.

Table 6. Overview protections

Protections

Symbol

Condition

DIAG

Outputs

Recovering

OTP

Tj > 150 °C

LOW

Floating

Automatic, after 5 μs and Tj < 150 °C

OCP

IO > IORM

LOW

Floating

Automatic, after 5 μs and IO < IORM

OVP

VP > 20 V

LOW

Floating

Restart (switch-off switch-on when VP < 20 V)

UVP

VP < 8 V

LOW

Floating

Restart (switch-off switch-on when VP > 8 V)

ODP

Tj > 135 °C and IO > IORM

LOW

Floating

Restart (switch-off switch-on when

 

 

 

 

Tj < 135 °C or IO < IORM)

WP

OUTX > VDDA - 1 V or

LOW

 

 

 

OUTX < VSSA + 1 V

 

 

 

TFA9810_3

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 20 February 2008

7 of 29

NXP Semiconductors

TFA9810

 

Audio amplifier 2 x 12 W

8.6 Start-up sequence

VP

 

 

 

 

 

 

 

ENABLE

 

 

 

 

 

 

 

STAB1

 

 

 

 

 

 

 

CDELAY

 

 

 

 

 

 

 

V IN x

 

 

 

 

 

 

 

 

FLOATING

 

FLOATING

 

 

 

 

 

PWM

 

 

PWM

 

 

OUT x

 

 

 

 

 

 

 

 

 

AUDIO

 

 

AUDIO

 

 

AUDIO

 

 

 

 

 

 

 

DIAG

 

 

 

 

 

 

 

SLEEP

START-UP

OPERATING

FAULT

RESTART

OPERATING

SHUT-DOWN

SLEEP

 

 

 

 

 

 

 

010aaa018

Fig 3. Start-up sequence

9. Internal circuitry

1,16, 17, 32

 

 

 

 

 

 

VDDA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22 V

VSSA

010aaa024

Fig 4. Internal circuitry 0001

TFA9810_3

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 20 February 2008

8 of 29

NXP Semiconductors

TFA9810

 

Audio amplifier 2 x 12 W

VDDA1

2

 

135

kΩ

5.5 V

hvp

VSSA

 

 

135

kΩ

5.5 V

3

VSSA1

010aaa025

Fig 5. Internal circuitry 0002

4

22 V

5

010aaa026

Fig 6. Internal circuitry 0003

VDDA1

VDDA1

50 µA

110 kΩ

6

VSSA1

VSSA

010aaa027

Fig 7. Internal circuitry 0004

TFA9810_3

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 20 February 2008

9 of 29

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