Philips (Now NXP) TDA1562Q Schematic [ru]

INTEGRATED CIRCUITS

DATA SH EET

TDA1562Q

70 W high efficiency power amplifier with diagnostic facility

Preliminary speciﬁcation File under Integrated Circuits, IC01

1998 Apr 07

Philips Semiconductors Preliminary speciﬁcation

70 W high efﬁciency power ampliﬁer with diagnostic facility

FEATURES

• Very high output power, operating from a single low supply voltage

• Low power dissipation, when used for music signals

• Switches to low output power at too high case

temperatures

• Few external components

• Fixed gain

• Differential inputs with high common mode rejection

• Mode select pin (on, mute and standby)

• Status I/O pin (class-H, class-B and fast mute)

• All switching levels with hysteresis

• Diagnostic pin with information about:

– Dynamic Distortion Detector (DDD) – Any short-circuit at outputs – Open load detector – Temperature protection.

• No switch-on or switch-off plops

TDA1562Q

• Fast mute on supply voltage drops

• Quick start option (e.g. car-telephony/navigation)

• Low (delta) offset voltage at the outputs

• Load dump protection

• Short-circuit safe to ground, supply voltage and across

the load

• Low power dissipation in any short-circuit condition

• Protected against electrostatic discharge

• Thermally protected

• Flexible leads.

GENERAL DESCRIPTION

The TDA1562Q is a monolithic integrated 70 W/4 Ω Bridge-Tied Load (BTL) class-H high efficiency power amplifier in a 17-lead DIL-bent-SIL plastic power package.

The device can be used for car audio systems (e.g. car, radio and boosters) as well as mains fed applications (e.g. midi/mini audio combinations and TV sound).

QUICK REFERENCE DATA

Test conditions: V

= 14.4 V; RL=4Ω; Rs=0Ω; f = 1 kHz; T

=25°C; unless otherwise speciﬁed.

amb

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

supply voltage operating 8 14.4 18 V

non-operating −−30 V load dump −−45 V

q(tot)

total quiescent current on and mute;

− 110 150 mA

RL= open circuit

stb

 output offset voltage on and mute −−100 mV

V

∆V

 delta output offset voltage on ↔ mute −−30 mV

 differential input impedance 90 150 − kΩ

Z

i(dif)

standby current standby − 150µA

voltage gain 25 26 27 dB

output power THD = 0.5% 45 55 − W

THD = 10% 60 70 − W

THD total harmonic distortion P

=1W − 0.03 − %

=20W − 0.06 − %

DDD active − 10 − % SVRR supply voltage ripple rejection on and mute 60 70 − dB CMRR common mode rejection ratio on 70 80 − dB ISRR input signal rejection ratio mute 80 90 − dB V

n(o)

noise output voltage on − 100 150 µV

1998 Apr 07 2

Philips Semiconductors Preliminary speciﬁcation

70 W high efﬁciency power ampliﬁer

TDA1562Q

with diagnostic facility

ORDERING INFORMATION

TYPE NUMBER

NAME DESCRIPTION VERSION

TDA1562Q DBS17P plastic DIL-bent-SIL power package; 17 leads (lead length 12 mm) SOT243-1

BLOCK DIAGRAM

handbook, full pagewidth

status I/O

mode

select

CLASS-B CLASS-H

FAST MUTE

STANDBY

MUTE

TEMPERATURE

SENSOR

disable

PACKAGE

C1+C1−

LIFT-SUPPLY

910

LOAD DUMP

PROTECTION

CURRENT

PROTECTION

IN+

IN−

ref

signal

GND

75 kΩ

15 kΩ

PREAMP

−

FEEDBACK

CIRCUIT

−

PREAMP

disable

reference voltage

VP*

POWERSTAGE

TDA1562Q

POWERSTAGE

VP*

LIFT-SUPPLY

15 13 6

LOAD

DETECTOR

C2+C2−

DIAGNOSTIC

INTERFACE

DYNAMIC

DISTORTION

DETECTOR

TEMPERATURE

PROTECTION

PGND1 PGND2

MGL264

OUT+

diagnostic

OUT−

Fig.1 Block diagram.

1998 Apr 07 3

Philips Semiconductors Preliminary speciﬁcation

70 W high efﬁciency power ampliﬁer with diagnostic facility

PINNING

SYMBOL PIN DESCRIPTION

IN+ 1 signal input (positive) IN− 2 signal input (negative) C1− 3 negative terminal of lift electrolytic

capacitor 1 MODE 4 mode select input C1+ 5 positive terminal of lift electrolytic

capacitor 1 PGND1 6 power ground 1 OUT+ 7 positive output DIAG 8 diagnostic output (open collector) V

OUT− 11 negative output PGND2 12 power ground 2 C2+ 13 positive terminal of lift electrolytic

ref

C2− 15 negative terminal of lift electrolytic

STAT 16 status I/O SGND 17 signal ground

9 supply voltage 1

10 supply voltage 2

capacitor 2

14 internal reference voltage

capacitor 2

handbook, halfpage

IN+ IN−

C1−

MODE

C1+

PGND1

OUT+

DIAG

OUT−

PGND2

C2+ V

ref

C2−

STAT

SGND

1 2 3 4 5 6 7 8 9

TDA1562Q

10 11 12 13 14 15 16 17

TDA1562Q

MGL263

1998 Apr 07 4

Fig.2 Pin configuration.

Philips Semiconductors Preliminary speciﬁcation

70 W high efﬁciency power ampliﬁer with diagnostic facility

FUNCTIONAL DESCRIPTION

The TDA1562Q contains a mono class-H BTL output power amplifier. At low output power, up to 18 W, the device operates as a normal BTL amplifier. When a larger output voltage swing is required, the internal supply voltage is lifted by means of the external electrolytic capacitors. Due to this momentarily higher supply voltage the obtainable output power is 70 W.

In normal use, when the output is driven with music-like signals, the high output power is only needed during a small percentage of time. Under the assumption that a music signal has a normal (Gaussian) amplitude distribution, the reduction in dissipation is about 50% when compared to a class-B output amplifier with the same output power. The heatsink should be designed for use with music signals. If the case temperature exceeds 120 °C, the device will switch back from class-H to class-B operation. The high power supply voltage is then disabled and the output power is limited to 20 W.

When the supply voltage drops below the minimum operating level, the amplifier will be muted immediately.

Mode select input (pin MODE)

This pin has 3 modes:

1. LOW, ‘standby’: the complete circuit is switched off, the supply current is very low

2. MID, ‘mute’: the circuit is switched on, but the input signal is suppressed

3. HIGH, ‘on’: normal operation, the input signal is amplified by 26 dB.

When the circuit is switched from mute to on or vice versa the actual switching takes place at a zero crossing of the input signal. The circuit contains a quick start option, i.e. when it is switched directly from standby to on, the amplifier is fully operational within 50 ms (important for applications like car telephony and car navigation).

TDA1562Q

Status I/O input (pin STAT)

NPUT

I This input has 3 possibilities:

1. LOW, ‘fast mute’: the circuit remains switched on, but the input signal is suppressed

2. MID, ‘class-B’: the circuit operates as class-B amplifier, the high power supply voltage is disabled, independent of the case temperature

3. HIGH, ‘class-H’: the circuit operates as class-H amplifier, the high power supply voltage is enabled, independent of the case temperature.

When the circuit is switched from fast mute to class-B/H or vice versa the switching is immediately carried out. When the circuit is switched from class-B to class-H or vice versa the actual switching takes place at a zero crossing of the input signal.

UTPUT

This output has 3 possibilities:

1. LOW, ‘mute’: acknowledge of muted amplifier

2. MID, ‘class-B’: the circuit operates as class-B amplifier, the high power supply voltage is disabled, caused by the case temperature Tc> 120 °C

3. HIGH, ‘class-H’: the circuit operates as class-H amplifier, the high power supply voltage is enabled, because the case temperature Tc< 120 °C.

When the circuit is switched from class-B to class-H or vice versa the actual switching takes place at a zero crossing of the input signal.

The status I/O pins of maximum 8 devices may be tied together for synchronizing purposes.

1998 Apr 07 5

Philips Semiconductors Preliminary speciﬁcation

70 W high efﬁciency power ampliﬁer with diagnostic facility

mute

HIGH

MID

LOW

V VRT

HIGH

MID

LOW

ref

handbook, full pagewidth

supply

voltage

mode select

input

reference

voltage

status I/O

input

TDA1562Q

status I/O

output

output voltage

across load

HIGH

MID

LOW

quick start

mute

zerocross change

class B/H-operation

Fig.3 Switching characteristics.

class-H (Tc < 120 °C)

class-B (Tc > 120 °C)

fast mute

function

zerocross mute

function

supply mute

function

MGL272

1998 Apr 07 6

Philips Semiconductors Preliminary speciﬁcation

70 W high efﬁciency power ampliﬁer with diagnostic facility

Diagnostic output (pin DIAG)

YNAMIC DISTORTION DETECTOR (DDD)

At the onset of clipping of the output stages, the DDD becomes active. This information can be used to drive a sound processor or DC-volume control to attenuate the input signal and so limit the distortion.

HORT-CIRCUIT PROTECTION

When a short-circuit occurs at the outputs to ground or to the supply voltage, the output stages are switched off. They will be switched on again approximately 20 ms after removing the short-circuit. During this short-circuit condition the diagnostic output is continuously LOW.

When a short-circuit occurs across the load, the output stages are switched off during approximately 20 ms. After that time is checked during approximately 50 µs whether the short-circuit is still present. During this short-circuit condition the diagnostic output is LOW for 20 ms and high for 50 µs. The power dissipation in any short-circuit condition is very low.

TDA1562Q

EMPERATURE DETECTION

Just before the temperature protection becomes active the diagnostic output becomes continuously LOW.

Load detection: directly after the circuit is switched from standby to mute or on, a build in detection circuit checks whether a load is present. The results of this check can be detected at the diagnostic output, by switching the mode select input in the mute mode.

Since the diagnostic output is an open collector output, more devices can be tied together.

handbook, full pagewidth

mode select

input

output voltage

across load

diagnostic

output

HIGH

MID

LOW

HIGH

LOW

no load

clipping signal

short-circuit to

supply or ground

short-circuit across load

MGL265

Fig.4 Diagnostic information.

1998 Apr 07 7

+ 14 hidden pages