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Application Report
SLOA092 – October 2001
1
PWM Power Driver Modulation Schemes
Richard Palmer High Performance Linear
ABSTRACT
This application report describes the modulation schemes implemented in the DRV59x
family of PWM power drivers to facilitate user design efforts. Texas Instruments offers
three modulation options with the introduction of the DRV590 and DRV591 PWM power
drivers and the DRV592 H-bridge.
1 Introduction
This report contains four sections that describe the DRV59x family modulation techniques:
• DRV590 Modulation Scheme
• DRV591 Modulation Scheme
• Comparison of the DRV590 and DRV591
• DRV592 Operation: User-Defined Modulation
The DRV590 and DRV591 sections each contain block diagrams showing typical connections
and figures showing the output waveforms for various input voltages. The DRV592 section
contains only the block diagram, because it does not generate its own PWM output waveform.
