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dsPIC33F/PIC24H Family Reference Manual

43.1 INTRODUCTION

This section describes the High-Speed PWM module and its associated operational modes. The

High-Speed PWM module supports a wide variety of PWM modes and is ideal for power

conversion applications. Some of the common applications that the High-Speed PWM module

supports are:

• AC-to-DC converters

• Power Factor Correction (PFC)

• Interleaved Power Factor Correction (IPFC)

• Inverters

• DC-to-DC converters

• Battery chargers

• Digital lighting

• Uninterruptable Power Supply (UPS)

• AC and DC motors

• Resonant converters

43.2 FEATURES

The High-Speed PWM module consists of the following major features:

• Up to nine PWM generators

• Two PWM outputs per PWM generator

• Individual time base and duty cycle for each PWM output

• Duty cycle, dead time, phase shift and frequency resolution of 1.04 ns

• Independent fault and current-limit inputs for all PWM outputs

• Redundant output

• True independent output

• Center-aligned PWM mode

• Output override control

• Special Event Trigger

• Prescaler for input clock

• Dual trigger to Analog-to-Digital Converter (ADC) per PWM period

•PWM

XL and PWMXH output pin swapping

• Independent PWM frequency, duty cycle and phase shift changes

• Leading-edge Blanking (LEB) functionality

• PWM capture functionality

• Up to two master time bases

• Dead-time compensation

• PWM chopping

Note: This family reference manual section is meant to serve as a complement to device

data sheets. Depending on the device variant, this manual section may not apply to

all dsPIC33F/PIC24H devices.

Please consult the note at the beginning of the “High-Speed PWM” chapter in the

current device data sheet to check whether this document supports the device you

are using.

Device data sheets and family reference manual sections are available for

download from the Microchip Worldwide Web site at: http://www.microchip.com

Note: Duty cycle, dead-time, phase shift and frequency resolution is 8.32 ns in

Center-aligned PWM mode.