16F1829 datasheet(227/420 Pages) MICROCHIP

227 / 420 page

 2010 Microchip Technology Inc.

Preliminary

DS41440A-page 229

PIC16F/LF1825/1829

24.4.1

HALF-BRIDGE MODE

In Half-Bridge mode, two pins are used as outputs to

drive push-pull loads. The PWM output signal is output

on the CCPx/PxA pin, while the complementary PWM

output signal is output on the PxB pin (see Figure 24-9).

This mode can be used for Half-Bridge applications, as

shown in Figure 24-9, or for Full-Bridge applications,

where four power switches are being modulated with

two PWM signals.

In Half-Bridge mode, the programmable dead-band delay

can be used to prevent shoot-through current in Half-

Bridge power devices. The value of the PDC<6:0> bits of

the PWMxCON register 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 24.4.5 “Programmable Dead-Band Delay

Mode” for more details of the dead-band delay

operations.

Since the PxA and PxB outputs are multiplexed with the

PORT data latches, the associated TRIS bits must be

cleared to configure PxA and PxB as outputs.

FIGURE 24-8:

EXAMPLE OF HALF-

BRIDGE PWM OUTPUT

FIGURE 24-9:

EXAMPLE OF HALF-BRIDGE APPLICATIONS

Period

Pulse Width

(1)

PxA(2)

PxB(2)

td = Dead-Band Delay

Period

(1)

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

PRx register.

2: Output signals are shown as active-high.

PxA

PxB

FET

Driver

FET

Driver

Load

FET

Driver

FET

Driver

V+

Load

FET

Driver

FET

Driver

PxA

PxB

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

Half-Bridge Output Driving a Full-Bridge Circuit

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