Analog Integrated Circuit Device Data

8

Freescale Semiconductor

17529

SYSTEM/APPLICATION INFORMATION

INTRODUCTION

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 lens

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

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

CONTROL CIRCUIT POWER SUPPLY (VDD)

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.

LOGIC INPUT CONTROL (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 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 input (IN1A, IN1B, IN2A, and IN2B) states.

H-BRIDGE OUTPUT (OUT1A, OUT1B, OUT2A, AND

OUT2B)

These terminals provide connection to the outputs of each

of the internal H-Bridges (see Figure 2, 17529 Simplified

Internal Block Diagram, page 2).

MOTOR DRIVE POWER SUPPLY (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.

CHARGE PUMP (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.

voltage. The VCRES voltage is power supply for internal

predriver circuit of H-Bridges.

POWER GROUND (PGND)

Power ground terminals. They must be tied together on the

PCB.

LOGIC GROUND (LGND)

Logic ground terminal.