Datasheet

 2011-2012 Microchip Technology Inc. DS75018C-page 183
dsPIC33FJ06GS001/101A/102A/202A and dsPIC33FJ09GS302
15.0 HIGH-SPEED PWM
The high-speed PWM module supports a wide variety
of PWM modes and output formats. This PWM module
is ideal for power conversion applications, such as:
• AC/DC Converters
• DC/DC Converters
• Power Factor Correction (PFC)
• Uninterruptible Power Supply (UPS)
•Inverters
• Battery Chargers
• Digital Lighting
15.1 Features Overview
The high-speed PWM module incorporates the
following features:
• Two to three PWM generators with four to six
outputs
• Individual time base and duty cycle for each of the
six PWM outputs
• Dead time for rising and falling edges:
• Duty cycle resolution of 1.04 ns
(1,2)
• Dead-time resolution of 1.04 ns
(1,2)
• Phase-shift resolution of 1.04 ns
(1,2)
• Frequency resolution of 1.04 ns
(1,2)
• Supported PWM modes:
- Standard Edge-Aligned
- True Independent Output
- Complementary
- Center-Aligned
- Push-Pull
- Multiphase
- Variable Phase
- Fixed Off Time
- Current Reset
- Current Limit
• Independent Fault/Current-Limit inputs for each of
the six PWM outputs
• Output override control
• Special Event Trigger
• PWM capture feature
• Prescaler for input clock
• Dual trigger from PWM to ADC
• PWMxH, PWMxL output pin swapping
• Remappable PWM4H, PWM4L pins
• On-the-fly PWM frequency, duty cycle and
phase-shift changes
• Disabling of individual PWM generators to reduce
power consumption
• Leading-Edge Blanking (LEB) functionality
• PWM output chopping (see Note 1)
Figure 15-1 conceptualizes the PWM module in a
simplified block diagram. Figure 15-2 illustrates how
the module hardware is partitioned for each PWM out-
put pair for the Complementary PWM mode. Each
functional unit of the PWM module is discussed in
subsequent sections.
The PWM module contains three PWM generators.
The module has up to six PWM output pins: PWM1H,
PWM1L, PWM2H, PWM2L, PWM4H and PWM4L. For
complementary outputs, these six I/O pins are grouped
into H/L pairs.
Note 1: This data sheet summarizes the features
of the dsPIC33FJ06GS001/101A/102A/
202A and dsPIC33FJ09GS302 families
of devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 43. “High-Speed
PWM” (DS70323) in the “dsPIC33F/
PIC24H Family Reference Manual”,
which is available on the Microchip web
site (www.microchip.com).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
Section 4.0 “Memory Organization” in
this data sheet for device-specific register
and bit information.
Note 1: Resolution is 8.32 ns in Center-Aligned
PWM mode.
2: Resolution is 8.32 ns for
dsPIC33FJ06GS001 devices.
Note 1: The chopping function performs a logical
AND of the PWM outputs with a very
high-frequency clock signal. The chop-
ping frequency is typically hundreds or
thousands of time higher in frequency, as
compared to the PWM frequency. Chop-
ping a PWM signal constrains the use of
a pulse transformer to cross the isolation
barrier.