PIC16F716 datasheet(44/126 Pages) MICROCHIP

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PIC16F716

DS41206A-page 42

Preliminary

 2003 Microchip Technology Inc.

7.4.2

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 RB3/CCP1/P1A pin, while the

complementary PWM output signal is output on the

RB5/P1B pin (Figure 7-12). This mode can be used for

half-bridge applications, as shown in Figure 7-11 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

PWM1CON 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 7.4.4 “Programmable Dead-

Band Delay” for more details of the dead-band delay

operations.

Since the P1A and P1B outputs are multiplexed with

the PORTB<3> and PORTB<5> data latches, the

TRISB<3> and TRISB<5> bits must be cleared to

configure P1A and P1B as outputs.

FIGURE 7-10:

HALF-BRIDGE PWM

OUTPUT

FIGURE 7-11:

EXAMPLES OF HALF-BRIDGE OUTPUT MODE APPLICATIONS

Period

Duty Cycle

(1)

P1A(2)

P1B(2)

td = Dead-band Delay

Period

(1)

Note

At this time, the TMR2 register is equal to the

PR2 register.

Output signals are shown as active-high.

PIC16F716

P1A

P1B

FET

Driver

FET

Driver

V+

V-

Load

FET

Driver

FET

Driver

V+

V-

Load

FET

Driver

FET

Driver

PIC16F716

P1A

P1B

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

Half-Bridge Output Driving a Full-Bridge Circuit

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