PIC18F2480 MICROCHIP [Microchip Technology], PIC18F2480 Datasheet - Page 180
PIC18F2480
Manufacturer Part Number
PIC18F2480
Description
28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F2480.pdf
(484 pages)
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PIC18F2480/2580/4480/4580
16.4.4
In the Half-Bridge Output mode, two pins are used as
outputs to drive push-pull loads. The PWM output
signal is output on the P1A pin, while the complemen-
tary PWM output signal is output on the P1B pin
(Figure 16-4). This mode can be used for half-bridge
applications, as shown in Figure 16-5, or for full-bridge
applications where four power switches are being
modulated with two PWM signals.
In Half-Bridge Output mode, the programmable
dead-band delay can be used to prevent shoot-through
current in half-bridge power devices. The value of bits,
PDC6:PDC0, sets the number of instruction cycles
before the output is driven active. If the value is greater
than the duty cycle, the corresponding output remains
inactive during the entire cycle. See Section 16.4.6
“Programmable Dead-Band Delay” for more details
of the dead-band delay operations.
Since the P1A and P1B outputs are multiplexed with
the PORTD<4> and PORTD<5> data latches, the
TRISD<4> and TRISD<5> bits must be cleared to
configure P1A and P1B as outputs.
FIGURE 16-5:
DS39637A-page 178
Standard Half-Bridge Circuit (“Push-Pull”)
Half-Bridge Output Driving a Full-Bridge Circuit
HALF-BRIDGE MODE
PIC18F2X80/4X80
EXAMPLES OF HALF-BRIDGE OUTPUT MODE APPLICATIONS
P1A
P1B
PIC18F2X80/4X80
P1A
P1B
FET
Driver
FET
Driver
Preliminary
FET
Driver
FET
Driver
FIGURE 16-4:
Note 1: At this time, the TMR2 register is equal to the
P1A
P1B
td = Dead-Band Delay
(2)
(2)
2: Output signals are shown as active-high.
Load
V+
V-
(1)
PR2 register.
V+
V-
td
Duty Cycle
Period
Load
td
HALF-BRIDGE PWM
OUTPUT
2004 Microchip Technology Inc.
FET
Driver
FET
Driver
(1)
+
V
-
+
V
-
Period
(1)
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