ZXCD1210

Issue 2 - October 2007

6

www.zetex.com

© Zetex Semiconductors plc 2007

The closed loop Class D architecture maintains high efficiency ensuring cool running in the

smallest footprint whilst achieving much reduced output impedance for tight bass control.

Additionally the feedback architecture compensates for supply dips and the bridge design

accommodates high off load voltages. This means that use of a basic SMPS or an unregulated

supply is achievable without compromising performance.

The designs feature soft start controls and under voltage lockout controls to maintain anti-pop

behavior. Design options include short circuit, thermal and DC offset protection circuits. Volume

and phase controls and high/low pass filters are simply added to the input circuitry.

The scalable architecture of the ZXCDSUBEV series utilises all N-channel output stage with either

bridge tied load (BTL) or single ended (SE) configurations, together with power supply options to

generate 150W, 300W or 500W RMS into 4

designs from a single platform. Many more power

options readily produced.

The ZXCD50STEVAL stereo and ZXCD100MOEVAL mono reference designs have an open loop

architecture and feature output stages constructed using Zetex MOSFETs directly driven from the

ZXCD modulator device.

ZXCD50STEVAL THD+N versus output power

They offer 50W and 100W into 4

respectively with typical THD+N of 0.5% and 0.9% up to 90%

full power. Careful design has eliminated any potential crossover distortion artifacts. Frequency

response is flat to 20kHz in these designs, typical noise floor is -110dB. These designs feature anti-

pop and over current protection and operate simply from a single supply rail.

Alternative configurations of these designs are possible with multi-channel applications simply

created with a master slave arrangement. Single ended operation is possible with the associated

performance compromises.

For further information on the ZXCD series reference designs, contact your local Zetex supplier

with details of your production project requirements.

0.2

2.4

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

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2.2

30m

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50m

100m

200m

500m

1

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5

10

20

Output Power (W)

0.2

2.4

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

30m

50

50m

100m

200m

500m

1

2

5

10

20

Output Power (W)