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IRAUDAMP9 Datasheet(PDF) 10 Page - International Rectifier |
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IRAUDAMP9 Datasheet(HTML) 10 Page - International Rectifier |
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10 / 39 page  www.irf.com IRAUDAMP9 REV 1.0 Page 10 of 39 IRAUDAMP9 Overview The IRAUDAMP9 features a single-channel self-oscillating PWM modulator. This topology results in the lowest component count, highest performance and robust design. It 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 IRAUDAMP9 self-oscillating topology incorporates the following functional blocks. • Front-end integrator • PW Modulator and Level shifters • Gate driver and buffer • Power MOSFETs • Output LPF + - AGND . . AGND AGND GNDD AGND Rin IN- AGND COMP . Rfb filter Rss AGND -VSS AGND +VAA IRS2092S LO VS VCC VB GNDD 0V 0V AGND Raa HO Cout R-FB Css Integrator COM Modulator and Shift level GND 0V 0V LP Filter L-out Caa +B +VCC -B INPUT Q3A IRFB4227 Q2 pnp Q2n npn Rgate Cfb filter pF Q4A IRFB4227 Q1p pnp Q1n npn Rgate C1integrator pF C2integrator nF Hi-side buffer Lo-side buffer Q3B IRFB4227 Q4B IRFB4227 Rgate Rgate Green Red LEDs RESET Trip OVP / UVP (TO-220 Case Temp.) OTP DCP D CSD Vo Vs Heatsink HOPS Fig. 7 Functional block diagram Functional Description Class-D Operation The C2integrator, C1integrator, R21 + potentiometer P1 form a front-end second-order integrator. This integrator receives a rectangular feedback signal from the Class D switching stage and outputs a quadratic oscillatory waveform as a carrier signal. To create the modulated PWM signal, the input |
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