Specifications

© 2008-2012 Microchip Technology Inc. DS70323E-page 43-113
Section 43. High-Speed PWM
High-Speed PWM
43
Revision C (March 2010) (Continued)
- Updated the following changes in 43.10.4 “Fault Exit”:
• Removed the following description: The next PWM cycle begins when the PTMR value
is zero
• Updated step “c)”
- Corrected the term “FSTAT” as “FLTSTAT” in 43.10.5 “Fault Exit with PMTMR
Disabled”
- Updated the following changes in 43.10.7 “PWM Current-Limit Pins”:
• Replaced the description “This behavior is called Current Reset mode, which is
used in some Power Factor Correction applications” as “Refer
to 43.16.5 “Current Reset PWM” for more details”
• Added 43.10.7.2 “Configuring Analog Comparator in Cycle-by-Cycle Mode”.
- Updated the following changes in 43.11.1 “Leading-Edge Blanking (LEB)”:
• Updated “8.4 ns” as “8.32 ns”
• Added the following description: In High-Speed Switching applications, switches (such
as MOSFETs/IGBTs) typically generate very large transients. These transients can
cause problematic measurement errors. The LEB function enables the user-assigned
application to ignore the expected transients caused by the transistor switching that
occurs near the edges of the PWM output signals.
- Corrected the term “current mode control” as “current-limit PWM control”
in 43.11.2 “Individual Time Base Capture”
- Updated the following changes in 43.12.4 “Fault/Current-Limit Override and Dead
Time Logic”:
• Corrected the following terms in the description: “low” is updated as “inactive” and
“impact” is updated as “aid”
• Added the terms “are driven active” in the description
- Added 43.12.6 “PENx (GPIO/PWM) Ownership”
- Updated the following changes in 43.15 “External Control of Individual Time
Base(s) (Current Reset Mode)”:
• Updated the title “External Control of Individual Time Base(s)” as “External
Control of Individual Time Base(s) (Current Reset Mode)”
• Added “Hysteresis and Critical Conduction mode” in the description
- Re-arranged the second paragraph in 43.16.3 “Multi-Phase PWM” as new sub
section 43.16.3.1 “Multi-Phase Buck Regulator”
- Added 43.16.3.2 “Interleaved Power Factor Correction (IPFC)”
- Added the advantages of Current Reset mode in PFC applications,
in 43.16.5 “Current Reset PWM”
- Added 43.17 “Burst Mode Implementation”
• Tables:
- Updated the following tables: Table 43-3 and Table 43-4
- Added the following tables: Table 43-5 through Table 43-7
• Specific references to “dsPIC33F” are updated as “dsPIC33F/PIC24H” in this Family
Reference Manual
• Renamed the Family Reference Manual name “dsPIC33F Section 43. High-Speed
PWM” as “dsPIC33F/PIC24H Section 43. High-Speed PWM”
• Changes to text and formatting were incorporated throughout the document