PIC18F44J10-ESLASHSP datasheet(138/358 Pages) MICROCHIP

138 / 358 page

PIC18F45J10 FAMILY

DS39682C-page 136

Preliminary

14.4.4

HALF-BRIDGE MODE

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 complementary PWM

output signal is output on the P1B pin (Figure 14-4). This

mode can be used for half-bridge applications, as shown

in Figure 14-5, 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 14.4.6

“Programmable Dead-Band Delay” for more details

of the dead-band delay operations.

Since the P1A and P1B outputs are multiplexed with

the PORTC<2> and PORTD<5> data latches, the

TRISC<2> and TRISD<5> bits must be cleared to

configure P1A and P1B as outputs.

FIGURE 14-4:

HALF-BRIDGE PWM

OUTPUT

FIGURE 14-5:

EXAMPLES OF HALF-BRIDGE OUTPUT MODE APPLICATIONS

Period

Duty Cycle

(1)

P1A(2)

P1B(2)

td = Dead-Band Delay

Period

(1)

Note 1: At this time, the TMR2 register is equal to the

PR2 register.

2: Output signals are shown as active-high.

PIC18F4XJ10

P1A

P1B

FET

Driver

FET

Driver

V+

V-

Load

FET

Driver

FET

Driver

V+

V-

Load

FET

Driver

FET

Driver

PIC18F4X5J10

P1A

P1B

Standard Half-Bridge Circuit (“Push-Pull”)

Half-Bridge Output Driving a Full-Bridge Circuit

PIC18F44J10-E/SP Datasheet(PDF) 138 Page - Microchip Technology

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