TOSHIBA ta8273h Datasheet

TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic

TA8273H

Max Power 47 W BTL × 4 ch Audio Power IC

The TA8273H is 4 ch BTL audio power amplifier for car audio

application.

This IC can generate more high power: P
is included the pure complementary PNP and NPN transistor
output stage.

It is designed low distortion ratio for 4 ch BTL audio power
amplifier, built-in stand-by function, muting function, and
diagnosis circuit which can detect output to V
output offset voltage and over voltage input mode.

Additionally, the AUX amplifier and various kind of protector
for car audio use are built-in.

Features

MAX = 47 W as it

OUT

/GND short,

CC

Weight: 7.7 g (typ.)

TA8273H

· High power : P
(V
: P
(VCC = 13.7 V, f = 1 kHz, JEITA max, RL = 4 Ω)
: P
(VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 Ω)
: P
(V

· Built-in diagnosis circuit (pin 25)

· Low distortion ratio: THD = 0.02% (typ.)

(V

· Low noise: VNO = 0.10 mVrms (typ.)
(V

· Built-in stand-by switch function (pin 4)

· Built-in muting function (pin 22)

· Built-in AUX amplifier from single input to 4 channels output (pin 16)

· Built-in various protection circuit

: Thermal shut down, over voltage, out to GND, out to V

· Operating supply voltage: V

MAX (1) = 47 W (typ.)

OUT

= 14.4 V, f = 1 kHz, JEITA max, RL = 4 Ω)

CC

MAX (2) = 43 W (typ.)

OUT

(1) = 29 W (typ.)

OUT

(2) = 25 W (typ.)

OUT

= 13.2 V, f = 1 kHz, THD = 10%, RL = 4 Ω)

CC

= 13.2 V, f = 1 kHz, P

CC

= 13.2 V, Rg = 0 Ω, GV = 27dB, BW = 20 Hz~20 kHz)

CC

CC (opr)

= 9~16 V

= 5 W, RL = 4 Ω)

OUT

CC

, out to out short

1

2002-02-13

Block Diagram

TA8273H

C1

C1

C6

C1

11

12

16

15

IN1

IN2

AUX IN

IN3

1 20 6

TAB V

CC1VCC2

OUT1 (+)

PW-GND1

OUT1 (-)

OUT2 (+)

PW-GND2

OUT2 (-)

OUT3 (+)

PW-GND3

OUT3 (-)

17

18

19

5

C

9

8

7

5

2

3

3

C

RL

RL

RL

C1

PRE-GND

14

13

IN4

DIAGNOSIS

RIP MUTE



C

STBY

10 25 22

2

OUT

4



R



2

7

C

OUT4 (+)

PW-GND4

OUT4 (-)



1

R

21

24

23



4

C

RL

: PRE-GND
: PW-GND

2

2002-02-13

Caution and Application Method

(Description is made only on the single channel.)

1. Voltage Gain Adjustment

This IC has no NF (negative feedback) terminals. Therefore, the voltage gain can’t adjusted, but it makes

the device a space and total costs saver.

Amp. 1

Input

Figure 1 Block Diagram

TA8273H

Amp. 2A

Amp. 2B

The voltage gain of Amp.1 : G
The voltage gain of Amp.2A, B : G
The voltage gain of BLT Connection : G

Therefore, the total voltage gain is decided by expression below.

G

= GV1 + GV2 + G

V

2. Stand-by SW Function

By means of controlling pin 4 (stand-by terminal)
to high and low, the power supply can be set to ON
and OFF. The threshold voltage of pin 4 is set at
about 3V
about 2 mA (typ.) at the stand-by state.

(typ.), and the power supply current is

BE

Control Voltage of pin 4: VSB

Stand-by Power VSB (V)

ON OFF 0~1.5

OFF ON 3~VCC

Adjustage of Stand-by SW

(1) Since V

omitted.

(2) Since the control current is microscopic, the switching relay of small current capacity is satisfactory

for switching

can directly be controlled to ON or OFF by the microcomputer, the switching relay can be

CC

= 1 + 20 + 6 = 27dB

V (BTL)

(pin 4)

= 1dB

V1

= 20dB

V2
V (BTL)

= 6dB

V

CC

ON

OFF

Power

4

10 kW

» 2 VBE

to BIAS
CUTTING CIRCUIT

Figure 2 With pin 4 set to High,
Power is turned ON

3

2002-02-13

TA8273H

Large current capacity switch

BATTERY

RELAY

BATTERY

3. Muting Function

By means of controlling pin 22 less than 0.5 V, it can make the audio muting condition.

The muting time constant is decided by R
ON/OFF.

The series resistance; R1 must be set up less than 10 kW to get enough muting attenuation.

The muting function have to be controlled by a transistor, FET and m-COM port which has I
250 mA ability.

Pin 22 terminal voltage has the temperature characteristics of 4.6 V (low temperature) to 3.2 V (high
temperature).

Therefore, it is need to design with attention as using the microcontroller of which operating voltage is
less than 5 V.

Terminal 22 may not be pulled up and shall be controlled by OPEN/LOW.

When it is obliged to do, it must be pulled up via diode, because it has to defend flowing reverse current
to internal circuit of pin 22.

<Recommended Application>

I (100 mA)

I

MUTE (OFF)

VCC

– Conventional Method –

Small current capacity switch

BATTERY

Stand-By V

V

CC

– Stand-by Switch Method –

V

CC

DIRECTLY FROM
MICROCOMPUTER

Stand-By

Figure 3

22

(pin 22)

4

C

R1

I

MUTE

V

MUTE

and C4 and these parts is related the pop noise at power

1

20

A

0

-20

-40

CC

ATT – V

FROM
MICROCOMPUTER

BATTERY

MUTE

10 kW 5 kW

MUTE

>

<Application for pulled up>

I (100 mA)

I

MUTE (OFF)

Figure 4 Muting Function

22

-60

-80

Mute attenuation ATT (dB)

R1

4

C

I

MUTE

V

MUTE

-100

0 0.4 0.8 1 1.2 1.6 2 2.4 2.8 3

Point A voltage: V

Figure 5 Mute Attenuation ---- V

4

VCC = 13.2 V
Po = 10 W
PL = 4 W
f = 1 kHz
BW = 400~30 kHz

(V)

MUTE

(V)

MUTE

2002-02-13

TA8273H

4. AUX Input

The pin 16 is for input terminal of AUX
amplifier.

The total gain is 0dB by using of AUX amplifier.

Therefore, the m-COM can directly drive the
AUX amplifier.

BEEP sound or voice synthesizer signal can be
input to pin 16 directly.

When AUX function is not used, this pin must be
connected to PRE-GND (pin 13) via a capacitor.

Diagnosis Output

5.

This diagnosis output terminal of pin 25 has open collector output structure on chip as shown in Figure 7.
In case diagnosis circuit that detect unusual case is operated, NPN transistor (Q1) or (Q2) is turned on.
It is possible to protect all the system of apparatus as well as power IC protection.

In case of being unused this function, use this IC as open-connection on pin 25.

(pin 16)

(pin 25)

m-COM

5 V

IN

AUX-IN

AUX AMP

16

-20dB

Figure 6 AUX Input

20dB AMP.

OUT (+)

OUT (-)

25

OUTPUT OFFSET

VOLTAGE

DETECTOR

OUTPUT SHORT

PROTECTOR

OVER VOLTAGE

PROTECTOR

pin 25: Open collector output (active low)

5 kW

Q2

Q1

5 V

GND

Figure 7 Self Diagnosis Output

5.1 In Case of Shorting Output to VCC/GND or Over Voltage Power Supplied

NPN transistor (Q1) is turned on.
Threshold of over voltage protection: V

5 V

25

m-COM

= 22 V (typ.)

CC

LED/LCD

ALARM

(Flashing)

(Announcement from a speaker.)

Q1 is turned on

t

Q2 is turned on

MEMORY

5.2 In Case of Shorting Output to Output

NPN transistor (Q1) is turned on and off in response to the input signal voltage.

REGULATOR → OFF

(Count and record)

Figure 8 Application 1

5

(Relay → OFF)

2002-02-13