Datasheet

 2011-2012 Microchip Technology Inc. Preliminary DS41579D-page 215
PIC16(L)F1782/3
24.3.4 PUSH-PULL PWM WITH
COMPLEMENTARY OUTPUTS
The complementary push-pull PWM is used to drive
transistor bridge circuits as well as synchronous
switches on the secondary side of the bridge. The
PWM waveform is output on four pins presented as
two pairs of two-output signals with a normal and
complementary output in each pair. Dead band can be
inserted between the normal and complementary
outputs at the transition times.
24.3.4.1 Mode Features
• Dead-band control is available
• No steering control available
• Primary PWM output is only on:
- PSMCxA
- PSMCxB
• Complementary PWM output is only on:
- PSMCxE
- PSMCxF
24.3.4.2 Waveform Generation
Push-Pull waveforms generate alternating outputs on
the output pairs. Therefore, there are two sets of rising
edge events and two sets of falling edge events
Odd numbered period rising edge event:
• PSMCxE is set inactive
• Dead-band rising is activated (if enabled)
• PSMCxA is set active
Odd numbered period falling edge odd event:
• PSMCxA is set inactive
• Dead-band falling is activated (if enabled)
• PSMCxE is set active
Even numbered period rising edge event:
• PSMCxF is set inactive
• Dead-band rising is activated (if enabled)
• PSMCxB is set active
Even numbered period falling edge event:
• PSMCxB is set inactive
• Dead-band falling is activated (if enabled)
• PSMCxF is set active
FIGURE 24-7: PUSH-PULL WITH COMPLEMENTARY OUTPUTS PWM WAVEFORM
Note: This is a subset of the 6-pin output of the
push-pull PWM output, which is why pin
functions are fixed in these positions, so
they are compatible with that mode. See
Section 24.3.6 “Push-Pull PWM with Four
Full-Bridge and Complementary Out-
puts”
.
1 2 3
Falling Edge Dead Band
Rising Edge Dead Band
Falling Edge Dead Band
Falling Edge Dead Band
Rising Edge Dead BandRising Edge Dead Band
PWM Period Number
Period Event
Rising Edge Event
Falling Edge Event
PSMCxA
PSMCxB
PSMCxE
PSMCxF