TEA2025D ,STEREO AUDIO AMPLIFIERTEA2025BTEA2025DSTEREO AUDIO AMPLIFIERDUAL OR BRIDGE CONNECTION MODESFEW EXTERNAL COMPONENTSSUPPLY ..
TEA2026 ,COLOR TV SCANNING AND POWER SUPPLY PROCESSOR= SGS-'mt3MS0H
" Wt1PiC(j)f LE©UE§©M©$ TEA2026C
COLOR TV SCANNING AND POWER SUPPLY PROCESSOR
..
TEA2026C ,COLOR TV SCANNING AND POWER SUPPLY PROCESSORGENERAL DESCRIPTION
INTRODUCTION
This integrated circuit uses I2L bipolar technology
and combi ..
TEA2028B ,IC for TVI SGS tr2'l'lf?,!l!,!lifil!ll
" mnema taewaemnee TEA2164S
SWITCH MODE POWER SUPPLY PRIMARYCIRCU ..
TEA2029C ,SWITCH MODE POWER SUPPLY PRIMARY CIRCUITI SGS tr2'l'lf?,!l!,!lifil!ll
" mnema taewaemnee TEA2164S
SWITCH MODE POWER SUPPLY PRIMARYCIRCU ..
TEA2029CV , Timing Processor (LINE, FRAME, SMPS) for TV Sets
TL16C550CIPTG4 ,Single UART with 16-Byte FIFOs and Auto Flow Control 48-LQFP -40 to 85 SLLS177H − MARCH 1994 − REVIS ..
TL16C550CIPTR ,Single UART with 16-Byte FIFOs and Auto Flow Control 48-LQFP -40 to 85 SLLS177H − MARCH 1994 − REVIS ..
TL16C550CN ,ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH AUTOFLOW CONTROL SLLS177H − MARCH 1994 − REVIS ..
TL16C550CPFB ,ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH AUTOFLOW CONTROL SLLS177H − MARCH 1994 − REVIS ..
TL16C550CPFBG4 , ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH AUTOFLOW CONTROL
TL16C550CPFBR , SINGLE UART WITH 16-BYTE FIFOS & AUTO FLOW CONTROL SLLS177H − MARCH 1994 − REVIS ..
TEA2025B-TEA2025B#-TEA2025B.-TEA2025D
STEREO AUDIO AMPLIFIER
TEA2025B
TEA2025DSTEREO AUDIO AMPLIFIER
DUAL OR BRIDGE CONNECTION MODES
FEW EXTERNAL COMPONENTS
SUPPLY VOLTAGE DOWN TO 3V
HIGH CHANNEL SEPARATION
VERY LOW SWITCH ON/OFF NOISE
MAX GAIN OF 45dB WITH ADJUST EXTER-
NAL RESISTOR
SOFT CLIPPING
THERMAL PROTECTION
3V < VCC < 15V
P = 2 • 1W, VCC = 6V, RL = 4Ω
P = 2 • 2.3W, VCC = 9V, RL = 4Ω
P = 2 • 0.1W, VCC = 3V, RL = 4Ω
DESCRIPTIONThe TEA2025B/D is a monolithic integrated circuit
in 12+2+2 Powerdip and 12+4+4 SO, intended for
use as dual or bridge power audio amplifier port-
able radio cassette players.
ABSOLUTE MAXIMUM RATINGS
BLOCK DIAGRAM1/9
POWERDIP 12+2+2 PIN CONNECTION (Top view)
SO 12+4+4 PIN CONNECTION (Top view)(*) The Rth j-amb is measured with 4sq cm copper area heatsink
(**) The Rth j-amb is measured on devices bonded on a 10 x 5 x 0.15cm glass-epoxy substrate with a 35μm thick copper surface of 5 cm2
THERMAL DATA
TEA2025B - TEA2025D
ELECTRICAL CHARACTERISTICS (Tamb = 25°C, VCC = 9V, Stereo unless otherwise specified)
Figure 1: Bridge Application (Powerdip) Figure 2: Stereo Application (Powerdip)
TEA2025B - TEA2025D
9 12 15I(mA)
Vs(V)
Figure 3: Supply Current vs. Supply Voltage(RL = 4Ω)
3.5 6 9 12 15
Po(W)
Vs(V)
Figure 5: Output Power vs. Supply Voltage(THD = 10%, f = 1KHz)
0.1 0.2 0.4 0.6 0.8 1
THD(%)
Po(W)
Figure 6: THD versus Output Power(f = 1KHz, VS = 6V) 9 12 15
Vo(V)
Vs(V)Vs(V)
Figure 4: Output Voltage vs. Supply Voltage
TEA2025B - TEA2025D
APPLICATION INFORMATION
Input CapacitorInput capacitor is PNP type allowing source to be
referenced to ground.
In this way no input coupling capacitor is required.
However, a series capacitor (0.22 uF)to the input
side can be useful in case of noise due to variable
resistor contact.
BootstrapThe bootstrap connection allows to increase the
output swing.
The suggested value for the bootstrap capacitors
(100uF) avoids a reduction of the output signal
also at low frequencies and low supply voltages.
Voltage Gain AdjustSTEREO MODE
The voltage gain is determined by on-chip resis-
tors R1 and R2 together with the external RfC1
series connected between pin 6 (11) and ground.
The frequency response is given approximated
by:
VOUT
VIN = R1
Rf + R2 + 1
JWC1With Rf=0, C1=100 uF, the gain results 46 dB
with pole at f=32 Hz.
THE purpose of Rf is to reduce the gain. It is rec-
ommended to not reduce it under 36 dB.
BRIDGE MODE
The bridge configuration is realized very easily
thanks to an internal voltage divider which pro-
vides (at pin 1) the CH 1 output signal after reduc-
tion. It is enough to connect pin 6 (inverting input
of CH 2) with a capacitor to pin 1 and to connect
to ground the pin 7.
The total gain of the bridge is given by:
VOUT
VIN = R1
Rf+R2 + 1
JWC1
(1+ R3 R1
R2+R4+ 1
JWC1
and with the suggested values (C1 = C2 = 100 μF,
Rf= 0) means:
Gv = 52 dB
with first pole at f = 32 Hz
Output Capacitors.The low cut off frequency due to output capacitor
depending on the load is given by:
FL = 1
2 ΠCOUT • RL
with COUT 470μF and RL = 4 ohm it means FL =
80 Hz.
Pop NoiseMost amplifiers similar to TEA 2025B need exter-
nal resistors between DC outputs and ground in
order to optimize the pop on/off performance and
crossover distortion.
The TEA 2025B solution allows to save compo-
nents because of such resistors (800 ohm)are in-
cluded into the chip.
Figure 7
Figure 8
Figure 9
TEA2025B - TEA2025D
StabilityA good layout is recommended in order to avoid
oscillations.
Generally the designer must pay attention on the
following points:
- Short wires of components and short connec-
tions.
- No ground loops.
- Bypass of supply voltage with capacitors as
nearest as possible to the supply I.C.pin.The
low value(poliester)capacitors must have
good temperature and frequency charac-
teristics.
- No sockets.
2) the heatsink can have a smaller factor of safety
compared with that of a conventional circuit.
There is no device damage in the case of ex-
cessive junction temperature: all that happens
is that PO (and therefore Ptot) and Id are re-
duced.
APPLICATION SUGGESTIONThe recommended values of the components are
those shown on stereo application circuit of
Fig. 2 different values can be used, the follow-
ing table can help the designer.
TEA2025B - TEA2025D
