PA2005 datasheet(7/16 Pages) UTC

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PA2005

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)

Vs-2VCE sat

IOUT max

Peak Output Current (before clipping)

Vs-2VCE sat

POUT max

RMS Output Power (before clipping)

(Vs-2VCE sat)2

2RL

(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 PA2005 in bridge configuration is:

The voltage gain of the bridge configuration is given by (see Figure 3):

Gv= V0

=1+

R2× R4

R2 + R4

For sufficiently high gains (40 ~ 50dB) it is possible to put R2=R4 and R3=2R1, simplifing the formula in:

Gv=4 R1

Gv (dB)

R1(Ω)

R2=R4(Ω)

R3(Ω)

1000

2000

1000

2000

Bridge Configuration

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