DSPIC33FJ32GS608 datasheet(225/416 Pages) MICROCHIP

225 / 416 page

 2009 Microchip Technology Inc.

Preliminary

DS70591B-page 225

dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610

16.0 HIGH-SPEED PWM

The

High-Speed

PWM

module

the

dsPIC33FJ32GS406/606/608/610

and

dsPIC33FJ64GS406/606/608/610 devices supports a

wide variety of PWM modes and output formats. This

PWM module is ideal for power conversion applica-

tions, such as:

• AC/DC Converters

• DC/DC Converters

• Power Factor Correction

• Uninterruptible Power Supply (UPS)

• Inverters

• Battery Chargers

• Digital Lighting

16.1

Features Overview

The High-Speed PWM module incorporates the

following features:

• Two master time base modules

• Up to nine PWM generators with up to 18 outputs

• 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 at 40 MIPS

• Independent fault and current-limit inputs for eight

PWM Outputs

• Redundant output

• True Independent output

• Center-Aligned PWM mode

• Output override control

• Chop mode (also known as Gated mode)

• Special Event Trigger

• Prescaler for input clock

• Dual trigger from PWM to Analog-to-Digital Con-

verter (ADC) per PWM period

• PWMxL and PWMxH output pin swapping

• Independent PWM frequency, duty cycle, and

phase shift changes

• Current compensation

• Enhanced Leading-Edge Blanking (LEB) functionality

• PWM Capture functionality

Figure 16-1 conceptualizes the PWM module in a

simplified block diagram. Figure 16-2 illustrates how

the module hardware is partitioned for each PWM

output pair for the Complementary PWM mode.

The PWM module contains nine PWM generators. The

module has up to 18 PWM output pins: PWM1H,

PWM1L,

PWM2H,

PWM2L,

PWM3H,

PWM3L,

PWM4H, PWM4L, PWM5H, PWM5L, PWM6H,

PWM6L,

PWM7H,

PWM7L,

PWM8H,

PWM8L,

PWM9H, and PWM9L. For complementary outputs,

these 18 I/O pins are grouped into H/L pairs.

16.2

Feature Description

The PWM module is designed for applications that

require:

• High-resolution at high PWM frequencies

• The ability to drive Standard, Edge-Aligned,

Center-Aligned Complementary mode, and

Push-Pull mode outputs

• The ability to create multiphase PWM outputs

For Center-Aligned mode, the duty cycle, period phase

and dead-time resolutions will be 8.32 ns.

Two common, medium power converter topologies are

push-pull and half-bridge. These designs require the

PWM output signal to be switched between alternate

pins, as provided by the Push-Pull PWM mode.

Phase-shifted PWM describes the situation where

each PWM generator provides outputs, but the phase

relationship between the generator outputs is

specifiable and changeable.

Multiphase PWM is often used to improve DC/DC con-

verter load transient response, and reduce the size of

output filter capacitors and inductors. Multiple DC/DC

converters are often operated in parallel, but

phase-shifted in time. A single PWM output operating at

250 kHz has a period of 4

s, but an array of four PWM

channels, staggered by 1

s each, yields an effective

switching frequency of 1 MHz. Multiphase PWM

applications typically use a fixed-phase relationship.

Variable phase PWM is useful in Zero Voltage

Transition (ZVT) power converters. Here, the PWM

duty cycle is always 50%, and the power flow is con-

trolled by varying the relative phase shift between the

two PWM generators.

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32GS406/606/608/610

and

dsPIC33FJ64GS406/606/608/610

families of devices. It is not intended to be

a comprehensive reference source. To

complement the information in this data

sheet, refer to Section 50. “High-Speed

PWM” (DS70579) in the “dsPIC33F/

PIC24H Family Reference Manual”,

which is available from the Microchip web

site (www.microchip.com).

2: Some registers and associated bits

described in this section may not be avail-

able on all devices. Refer to Section 4.0

“Memory Organization” in this data

sheet for device-specific register and bit

information.

Note:

Duty cycle, dead-time, phase shift and

frequency resolution is 8.32 ns in

Center-Aligned PWM mode.

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