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TDA2005L-J11-A-T Datenblatt(PDF) 7 Page - Unisonic Technologies

Teilenummer TDA2005L-J11-A-T
Bauteilbeschribung  20W BRIDGE AMPLIFIER FOR CAR RADIO
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Hersteller  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

TDA2005L-J11-A-T Datenblatt(HTML) 7 Page - Unisonic Technologies

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TDA2005
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
7 of 16
www.unisonic.com.tw
QW-R107-035,D
BRIDGE AMPLIFIER DESIGN
The following consideraions can be useful when designing a bridge amplifier.
PARAMETER
SINGLE ENDED
BRIDGE
VOUT max
Peak Output Voltage (before clipping)
(Vs-2VCE sat)
1
2
Vs-2VCE sat
IOUT max
Peak Output Current (before clipping)
Vs-2VCE sat
1
2
RL
Vs-2VCE sat
RL
POUT max
RMS Output Power (before clipping)
(Vs-2VCE sat)2
2RL
4
1
(Vs-2VCE sat)2
2RL
Where: VCE sat=output transistors saturation voltage
VS=allowable supply voltage
RL=load impedance
Voltage and current swings are twice for a bridge amplifier in comparison with single ended amplifier. In order
words, with the same RL the bridge configuration can deliver an output power that is four times the output power of a
single ended amplifier, while, with the same max output current the bridge configuration can deliver an output power
that is twice the output power of a single ended amplifier. Core must be taken when selecting Vs and RL in order to
avoid an output peak current above the absolute maximum rating.
From the expression for Io max, assuming Vs=14.4V and VCE sat=2V, the minimum load that can be driven by
UTC TDA2005 in bridge configuration is:
The voltage gain of the bridge configuration is given by (see Figure 3):
Gv= V0
V1
=1+
R1
RR4
R2 + R4
R3
R4
+
For sufficiently high gains (40 ~ 50dB) it is possible to put R2=R4 and R3=2R1, simplifing the formula in:
Gv=4 R1
R2
GV (dB)
R1(Ω)
R2=R4(Ω)
R3(Ω)
40
1000
39
2000
50
1000
12
2000
Bridge Configuration


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