Analog Integrated Circuit Device Data

8

Freescale Semiconductor

17533

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 17533 is a monolithic dual H-Bridge ideal for portable

electronic applications to control bipolar stepper motors and

brush DC motors such as those found in camera len

assemblies, camera shutters, optical disk drives, etc.

The 17533 operates from 2.0 V to 6.8 V, with independent

control of each H-Bridge via parallel MCU interface (3.0 V-

and 5.0 V-compatible I/O). The device features built-in shoot-

through current protection and undervoltage shutdown.

The 17533 has four operating modes: Forward, Reverse,

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

comprising the output bridge have a total source + sink

The 17533 can simultaneously drive two brush DC motors

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

one bipolar stepper motor. The drivers are designed to be

PWM’ed at frequencies up to 200 kHz.

FUNCTIONAL PIN DESCRIPTION

LOGIC SUPPLY (VDD)

The VDD pin 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 control pins.

LOGIC INPUT CONTROL (IN1A, IN1B, IN2A, AND

IN2B)

These logic input pins control each H-Bridge output (e.g.,

IN1A logic HIGH = OUT1A HIGH, etc.). However, if all inputs

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

to Table 5, Truth Table, page 7).

OUTPUT ENABLE (OE)

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.

OUTPUT A AND B OF H-BRIDGE CHANNEL 1 AND

2 (OUT1A, OUT1B, OUT2A, AND OUT2B)

These pins provide connection to the outputs of each of

the internal H-Bridges (see Figure 2, 17533 Simplified

Internal Block Diagram, page 2).

MOTOR DRIVE POWER SUPPLY (VM1 AND VM2)

The VM pins 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 pins. All VM pins

must be connected together on the printed circuit board.

GATE DRIVER CIRCUIT VOLTAGE INPUT (VG)

The VG pin is the input pin for the gate drive voltage.

POWER GROUND (PGND)

Power ground pins. They must be tied together on the

PCB.

LOGIC GROUND (LGND)

Logic ground pin.