Product specification
File under Integrated Circuits, IC01
July 1994
Page 2
Philips SemiconductorsProduct specification
2 x 12 W hi-fi audio power amplifier
TDA1521
TDA1521Q
GENERAL DESCRIPTION
The TDA1521/TDA1521Q is a dual hi-fi audio power amplifier encapsulated in a 9-lead plastic power package.
The device is especially designed for mains fed applications (e.g. stereo tv sound and stereo radio).
Features
• Requires very few external components
• Input muted during power-on and off
(no switch-on or switch-off clicks)
• Low offset voltage between output and ground
• Excellent gain balance between channels
• Hi-fi according to IEC 268 and DIN 45500
• Short-circuit-proof
• Thermally protected
QUICK REFERENCE DATA
Stereo applications
Supply voltage rangeV
Output power at THD = 0,5%,
V
= ± 16 VP
P
Voltage gainG
Gain balance between channels∆G
Ripple rejectionSVRRtyp.60dB
Channel separationαtyp.70dB
Noise output voltageV
P
O
v
no(rms)
± 7,5 to ± 21,0V
typ.12W
typ.30dB
typ.0,2dB
v
typ.70µV
PACKAGE OUTLINES
TDA1521: 9 leads in-line; plastic power (SOT131); SOT131-1; 1996 August 20.
TDA1521Q: 9 leads SIL-bent-to-DIL; plastic power (SOT157); SOT157-2; 1996 August 20.
This hi-fi stereo power amplifier is designed for mains fed applications. The circuit is designed for both symmetrical and
asymmetrical power supply systems. An output power of 2 × 12 watts (THD = 0,5%) can be delivered into an 8 Ω load
with a symmetrical power supply of ± 16 V.
The gain is fixed internally at 30 dB. Internal gain fixing gives low gain spread and very good balance between the
amplifiers (0,2 dB).
A special feature of this device is a mute circuit which suppresses unwanted input signals during switching on and off.
Referring to Fig.13, the 100 µF capacitor creates a time delay when the voltage at pin 3 is lower than an internally fixed
reference voltage. During the delay the amplifiers remain in their DC operating mode but are isolated from the
non-inverting inputs on pins 1 and 9.
Two thermal protection circuits are provided, one monitors the average junction temperature and the other the
instantaneous temperature of the power transistors. Both protection circuits activate at 150 °C allowing safe operation to
a maximum junction temperature of 150°C without added distortion.
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
PARAMETERCONDITIONSSYMBOLMIN.MAX.UNIT
Supply voltagepin 7V
pin 5−V
Non-repetitive peak
output currentpins 4 and 6I
Total power dissipationsee Fig.2P
Storage temperature rangeT
Junction temperatureT
Short-circuit time:see note
outputs short-circuited
to groundsymmetrical
(full signal drive)power supplyt
asymmetrical
power supply;
< 32 V
V
P
(unloaded);
R
≥ 4 Ωt
i
P
OSM
tot
stg
j
sc
sc
= V
= V
P
7-3
5-3
−+21V
−−21V
− 4A
−55+150°C
−150°C
−1hour
−1hour
Note
For asymmetrical power supplies (at short circuiting of the load) the maximum supply voltage is limited to VP = 28 V.
If the total internal resistance of the supply (Ri) > 4 Ω, the maximum unloaded supply voltage is increased to 32 V.
July 19944
Page 5
Philips SemiconductorsProduct specification
2 x 12 W hi-fi audio power amplifier
TDA1521
TDA1521Q
Fig.2 Power derating curve.
THERMAL RESISTANCE
From junction to caseR
HEATSINK DESIGN EXAMPLE
With derating of 2,5 K/W, the value of heatsink thermal resistance is calculated as follows:
given RL = 8 Ω and VP = ±16 V, the measured maximum dissipation is 14,6 W; then, for a maximum ambient temperature
of 65 °C, the required thermal resistance of the heatsink is
R
th h a–
Note: The internal metal block (heatsink) has the same potential as pin 5 (−V
150 65–
---------------------14 6,
25 33 K W⁄,=,–=
th j-c
= 2,5 K/W
).
P
July 19945
Page 6
Philips SemiconductorsProduct specification
2 x 12 W hi-fi audio power amplifier
TDA1521
TDA1521Q
CHARACTERISTICS
PARAMETERCONDITIONSSYMBOLMIN.TYP.MAX.UNIT
Supply voltage range
operating modeV
input mute modeV
P
P
Repetitive peak
output currentI
ORM
Operating mode: symmetrical power supply; test circuit as per Fig.12;
= ± 16 V; RL = 8 Ω; T
V
P
Total quiescent currentwithout R
Output powerTHD = 0,5%P
2. Ripple rejection at RS = 0 Ω, f = 100 Hz to 20 kHz; ripple voltage = 200 mV (r.m.s. value) applied to positive or
negative supply rail.
= 25 °C; f = 1 kHz
amb
184070mA
56−W
6,58−W
THD = 10%P
tot
o
o
note 1B20kHz
V
V
= 2 kΩV
S
= 0 Ωα−45−dB
S
no(rms)
142026kΩ
i
293031dB
−0,21dB
−70140µV
July 19947
Page 8
Philips SemiconductorsProduct specification
2 x 12 W hi-fi audio power amplifier
TDA1521
TDA1521Q
APPLICATION INFORMATION
Input mute circuit
The input mute circuit operates only during switching on and off of the supply voltage. The circuit compares the 1/2 supply
voltage (at pin 3) with an internally fixed reference voltage (V
voltage at pin 3 is lower than V
at pin 3 is determined by an internal voltage divider and the external 100 µF capacitor.
During switching on, a time delay is created between the reference voltage and the voltage at pin 3, during which the
input terminal is disconnected, (as illustrated in Fig.3).
the non-inverting inputs (pins 1 and 9) are disconnected from the amplifier. The voltage
ref
), derived directly from the supply voltage. When the
ref
Fig.3 Input mute circuit; time delay.
July 19948
Page 9
Philips SemiconductorsProduct specification
2 x 12 W hi-fi audio power amplifier
TDA1521
TDA1521Q
Fig.4Output power as a function of supply
voltage; symmetrical supply;
RL = 8 Ω; f = 1 kHz.
Fig.5Distortion as a function of frequency;
symmetrical supply; VP = ± 16 V;
RL = 8 Ω; Po = 6 W.
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
w M
b
p
E
h
12.2
105.08
11.8
0510 mm
scale
(1)
12bp
2.54
e
5.08
B
E
A
L
3
L
E
2
h
6
Q
LL3m
3.4
12.4
3.1
11.0
c
2.4
1.6
e
2
4.3
2.1
1.8
v M
(1)
v
Qj
0.8
0.25w0.03
Z
x
2.00
1.45
m
OUTLINE
VERSION
SOT157-2
IEC JEDEC EIAJ
REFERENCES
July 199413
EUROPEAN
PROJECTION
ISSUE DATE
92-10-12
95-03-11
Page 14
Philips SemiconductorsProduct specification
2 x 12 W hi-fi audio power amplifier
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
“IC Package Databook”
our
Soldering by dipping or by wave
The maximum permissible temperature of the solder is
260 °C; solder at this temperature must not be in contact
with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.
(order code 9398 652 90011).
TDA1521
TDA1521Q
The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (T
printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.
Repairing soldered joints
Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300 °C it may remain in
contact for up to 10 seconds. If the bit temperature is
between 300 and 400 °C, contact may be up to 5 seconds.
stg max
). If the
DEFINITIONS
Data sheet status
Objective specificationThis data sheet contains target or goal specifications for product development.
Preliminary specificationThis data sheet contains preliminary data; supplementary data may be published later.
Product specificationThis data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
July 199414
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