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High-Speed PWM

Section 14. High-Speed PWM

HIGHLIGHTS

This section of the manual contains the following major topics:

14.1 Introduction .................................................................................................................. 14-2

14.2 Features....................................................................................................................... 14-2

14.3 Control Registers ......................................................................................................... 14-3

14.4 Architecture Overview................................................................................................ 14-24

14.5 Module Description .................................................................................................... 14-27

14.6 PWM Operating Modes.............................................................................................. 14-33

14.7 PWM Generator......................................................................................................... 14-71

14.8 PWM Trigger.............................................................................................................. 14-87

14.9 PWM Interrupts.......................................................................................................... 14-98

14.10 PWM Fault Pins ......................................................................................................... 14-99

14.11 Special Features ...................................................................................................... 14-105

14.12 PWM Output Pin Control...........................................................................................14-111

14.13 Immediate Update of PWM Duty Cycle ................................................................... 14-113

14.14 Power-Saving Modes............................................................................................... 14-114

14.15 External Control of Individual Time Base(s)............................................................. 14-114

14.16 Application Information ............................................................................................ 14-115

14.17 Register Map............................................................................................................ 14-126

14.18 Related Application Notes........................................................................................ 14-127

14.19 Revision History ....................................................................................................... 14-128

dsPIC33E/PIC24E Family Reference Manual

14.1 INTRODUCTION

This section describes the High-Speed Pulse-Width Modulator (PWM) module and its

associated operational modes. The High-Speed PWM module in the dsPIC33E/PIC24E

device family supports a wide variety of PWM modes and is ideal for power

conversion/motor control applications. Some of the common applications include:

• AC-to-DC converters

• DC-to-DC converters

• AC and DC motors: BLDC, PMSM, ACIM, SRM, etc.

• Inverters

• Battery chargers

• Digital lighting

• Uninterrupted Power Supply (UPS)

• Power Factor Correction (PFC) (e.g., Interleaved PFC and Bridgeless PFC)

14.2 FEATURES

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

• Up to seven PWM generators, each with an individual time base

• Two PWM outputs per PWM generator

• Individual period and duty cycle for each PWM output

• Duty cycle, dead time, phase shift and frequency resolution equal to the system clock

source (TOSC)

• Independent fault and current-limit inputs for up to 14 PWM outputs

• Redundant Output mode

• Independent Output mode (this feature is not available on all devices)

• Push-Pull Output mode

• Complementary Output mode

• Center-Aligned PWM mode

• Output override control

• Special Event Trigger

• PWM capture feature

• Prescaler for input clock

• ADC triggering with PWM

• Independent PWM frequency, duty cycle and phase shift changes

• Leading-Edge Blanking (LEB) functionality

• Dead time compensation

• Output clock 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 dsPIC33E/PIC24E 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

Produktspecifikationer

Varumärke:	Microchip
Kategori:	Inte kategoriserad
Modell:	DSPIC33EP128MC502

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