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IRAUDAMP6 REV 1
.0
IRAUDAMP6 Overview
The IRAUDAMP6 features a 2CH self-oscillating type PWM modulator for the lowest component
count, highest performance and robust design. This topology represents an analog version of a
second-order sigma-delta modulation having a Class D switching stage inside the loop. The
benefit of the sigma-delta modulation, in comparison to the carrier-signal based modulation, is that
all the error in the audible frequency range is shifted to the inaudible upper-frequency range by
nature of its operation. Also, sigma-delta modulation allows a designer to apply a sufficient
amount of error correction.
The IRAUDAMP6 self-oscillating topology consists of following essential functional blocks.
•
Front-end integrator
•
PWM comparator
•
Level shifters
•
Gate drivers and MOSFETs
•
Output LPF
IRF6785
Direct-FET
Feedback
GND
LPF
+B
-B
Σ
IRS20957S
Gate Driver
U1
U1
Daughter-board
Integrator
Fig 8, Simplified Block Diagram of Class D Amplifier
Summary of Contents for IRAUDAMP6
Page 11: ...www irf com Page 11 of 46 IRAUDAMP6 REV 1 0 Fig 7 Channel separation vs frequency...
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