NXP Semiconductors TFA9810 Manuale operativo

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

TFA9810

Stereo full-bridge audio ampliﬁer 2 x 12 W

Rev. 03 — 20 February 2008 Product data sheet

Table 1. Quick reference data

amb

= 25

C; V

= 12 V; f

osc

= 550 kHz; Figure 33 unless otherwise speciﬁed

Symbol Parameter Condition Min Typ Max Unit

VPsupply voltage VP= VDDPx −VSSPx 81220V

Ioff off-state current off mode - 110 200 µA

Iqquiescent current with load, ﬁlter and

snubbers connected -3545mA

ηpo output power

efﬁciency output power

2 x 9 W into 8 Ω;

Po=P

o(nom)

87 89 - %

Product data sheet Rev. 03 — 20 February 2008 2 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

5. Ordering information

Po(RMS) RMS output power RL= 8 Ω; VP= 12 V;

THD = 10 %;Twochannel

driven; no heat sink

required.

- 9.5 - W

Pooutput 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;

THD = 10 %; thermally

limited

-15-W

VP= 16 V; RL= 8 Ω;

THD = 10 %; thermally

limited

-15-W

VP= 12 V; RL= 6 Ω;

THD = 10 %; thermally

limited

-12-W

VP= 12 V; RL= 4 Ω;

THD = 10 %; thermally

limited

-15-W

Table 1. Quick reference data

…continued

amb

= 25

C; V

= 12 V; f

osc

= 550 kHz; Figure 33 unless otherwise speciﬁed

Symbol Parameter Condition Min Typ Max Unit

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

Product data sheet Rev. 03 — 20 February 2008 3 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

6. Block diagram

Fig 1. Block diagram

VDDP1

VSSP1

BOOT1P

VDDP1

OUT1P

VSSP1

BOOT1N

OUT1N

STAB1

BOOT2P

STABI1

CONTROL

LOGIC 23

DRIVER

HIGH

VDDP2

VSSP2

VDDP2

OUT2P

VSSP2

BOOT2N

OUT2N

STAB2

STABI2

VDDA1

IN1P

IN1N

VSSA1

VDDA2

IN2P

IN2N

VSSA2

REFERENCE

PROTECTION

OVP

UVP

OCP

OTP

ODP

HEATSPREADER

COMPARATOR 1

COMPARATOR 2

SO/OL

ENABLE

CDELAY

DIAG

TEST 11

1161732

VSSD(HW)

n.c.

TFA9810

010aaa016

CONTROL

LOGIC

DRIVER

HIGH

DRIVER

LOW

DRIVER

LOW

CONTROL

LOGIC

CONTROL

LOGIC

DRIVER

HIGH

DRIVER

LOW

DRIVER

HIGH

DRIVER

LOW

Product data sheet Rev. 03 — 20 February 2008 4 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

7. Pinning information

7.1 Pinning

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

Fig 2. Pin conﬁguration

TFA9810

SO32

VSSD(HW) VSSD(HW)

IN1P STAB1

IN1N VSSP1

VDDA1 BOOT1N

VSSA1 OUT1N

SO/OL BOOT1P

ENABLE OUT1P

CDELAY VDDP1

n.c. VDDP2

DIAG OUT2P

TEST BOOT2P

VSSA2 OUT2N

VDDA2 BOOT2N

IN2N VSSP2

IN2P STAB2

VSSD(HW) VSSD(HW)

010aaa017

Table 3. Pin description

Symbol Pin Description

VSSD(HW) 1, 16, 17,

32 Negative digital supply voltage and handle wafer

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

Product data sheet Rev. 03 — 20 February 2008 5 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

8. Functional description

8.1 General

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.

The device has two modes: SLEEP and OPERATING.

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

Table 3. Pin description

…continued

Symbol Pin Description

Table 4. SO/OL connections

Interfacing

SO/OL connected to Conﬁguration

VSSD(HW) Self-oscillating

Open Open-loop

Product data sheet Rev. 03 — 20 February 2008 6 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.

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.

8.3.1 Operating 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.

8.3.2 Operating 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.

8.4 Diagnostic

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.

Table 5. Start-up

Interfacing

ENABLE [V] Mode

ENABLE < 0.8 V SLEEP

ENABLE > 3 V OPERATING

Product data sheet Rev. 03 — 20 February 2008 7 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 °CorI

O<I

ORM)

WP OUTX > VDDA - 1 V or

OUTX < VSSA + 1 V LOW

Product data sheet Rev. 03 — 20 February 2008 8 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

8.6 Start-up sequence

9. Internal circuitry

Fig 3. Start-up sequence

SLEEP START-UP OPERATING FAULT RESTART OPERATING SHUT-DOWN SLEEP

FLOATING

AUDIO

PWM

010aaa018

AUDIO

PWM

FLOATING

ENABLE

STAB1

CDELAY

V IN x

OUT x

AUDIO

DIAG

Fig 4. Internal circuitry 0001

22 V

VDDA

VSSA

1,16, 17, 32

010aaa024

Product data sheet Rev. 03 — 20 February 2008 9 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

Fig 5. Internal circuitry 0002

Fig 6. Internal circuitry 0003

Fig 7. Internal circuitry 0004

hvp VSSA

135 kΩ

5.5 V

VSSA1

VDDA1

010aaa025

22 V

010aaa026

110 kΩ

VSSA

010aaa027

VDDA1

VSSA1

VDDA1

50 µA

Product data sheet Rev. 03 — 20 February 2008 10 of 29

NXP Semiconductors TFA9810

Audio ampliﬁer 2 x 12 W

Fig 8. Internal circuitry 0005

Fig 9. Internal circuitry 0006

Fig 10. Internal circuitry 0007

3 kΩ

VSSA

250 nA

VDDA1

010aaa028

VDDA1

DISCHARGE

VSSA1

010aaa029

2 nA

200 nA 5 kΩ

VDDA1

VSSA1 V

SSD

010aaa030

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