17529(2004) 데이터 시트보기 (PDF) - Freescale Semiconductor

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17529
(Rev.:2004)

0.7 A Dual H-Bridge Motor Driver with 3.0V/5.0V Compatible Logic I/O

Freescale Semiconductor 

Freescale Semiconductor, Inc.

SYSTEM/APPLICATION INFORMATION

INTRODUCTION

The 17529 is a monolithic dual H-Bridge ideal for portable

electronic applications to control bipolar step motors and brush

DC motors such as those found in camera len assemblies,

camera shutters, optical disk drives, etc. The 17529 operates

from 2.0 V to 6.8 V, providing dual H-bridge motor drivers with

parallel 3.0 V- or 5.0 V-compatible I/O. The device features an

on-board charge pump, as well as built-in shoot-through current

protection and undervoltage shutdown.

The 17529 has four operating modes: Forward, Reverse,

Brake, and Tri-Stated (High Impedance). The MOSFETs

comprising the output bridge have a total source + sink RDS(ON)

≤ 1.2 Ω.

The 17529 can simultaneously drive two brush DC motors

or, as shown in the simplified application diagram on page 1,

one bipolar step motor. The drivers are designed to be PWM’ed

at frequencies up to 200 kHz.

FUNCTIONAL TERMINAL DESCRIPTION

VDD

The VDD terminal carries the logic supply voltage and current

into the logic sections of the IC. VDD has an undervoltage

threshold. If the supply voltage drops below the undervoltage

threshold, the output power stage switches to a tri-state

condition. When the supply voltage returns to a level that is

above the threshold, the power stage automatically resumes

normal operation according to the established condition of the

input terminals.

IN1A, IN1B, IN2A, and IN2B

These logic input terminals control each H-Bridge output.

IN1A logic HIGH = OUT1A HIGH. However, if all inputs are

taken HIGH, the outputs bridges are both tri-stated (refer to

Table 1, Truth Table, page 7).

OE

The OE terminal is a LOW = TRUE enable input. When

OE = HIGH, all H-Bridge outputs (OUT1A, OUT1B, OUT2A,

and OUT2B) are tri-stated (high-impedance), regardless of

logic inputs (IN1A, IN1B, IN2A, and IN2B) states.

OUT1A, OUT1B, OUT2A, and OUT2B

These terminals provide connection to the outputs of each of

the internal H-Bridges (see Figure 1, 17529 Simplified Internal

Block Diagram, page 2).

VM1 and VM2

The VM terminals carry the main supply voltage and current

into the power sections of the IC. This supply then becomes

controlled and/or modulated by the IC as it delivers the power

to the loads attached between the output terminals. All VM

terminals must be connected together on the printed circuit

board.

C1L and C1H, C2L and C2H

These two pairs of terminals, the C1L and C1H and the C2L

and C2H, connect to the external bucket capacitors required by

the internal charge pump. The typical value for the bucket

capacitors is 0.1 µF.

CRES

The CRES terminal is the output of the internal charge pump.

Its output voltage is approximately three times the VDD voltage.

The VCRES voltage is power supply for internal predriver circuit

of H-Bridges.

PGND

Power ground terminals. They must be tied together on the

PCB.

LGND

Logic ground terminal.

17529

8

For More Information OMnOTTOhRiOsLAPrAoNdAuLOcGt,INTEGRATED CIRCUIT DEVICE DATA

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