KIT17C724EPEVBE【PDF 8/15 页】KIT FOR 17C7242CH HBRIDGE PWR IC

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FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 17C724 is a monolithic dual H-Bridge that is ideal in

portable electronic applications to control bipolar step motors

and brush DC motors, such as those used in camera lens and

shutters. The 17C724 can operate efficiently with supply

voltages as low as 2.7 V to as high as 5.5 V, and provide

continuous motor drive currents of 0.4 A while handling peak

currents up to 0.8 A. It is easily interfaced to low cost MCUs

via parallel 3.0 V or 5.0 V compatible logic. The device can be

pulse width modulated (PWM’ed) at up to 200 kHz.

The 17C724 can drive two motors simultaneously (see

Figure 6 ), or it can drive one bipolar step motor as shown in

parallel drive is also possible if higher current drive is desired

(0.8 A). Two-motor operation is accomplished by hooking

one motor between OUT1A and OUT1B, and the other motor

between OUT2A and OUT2B.

This IC has a built-in shoot-through current protection

circuit and undervoltage detector to avoid malfunction. It also

allows for power-conserving Sleep mode by the setting of the

PSAVE pin (refer to Table 5, Truth Table , page 7 ).

The device features four operating modes: forward,

reverse, brake, and tri-stated (high-impedance).

the simplified application diagram on page 1 . Dual channel

FUNCTIONAL PIN DESCRIPTION

LOGIC CIRCUIT POWER SUPPLY (VDD)

The VDD pin carries the power source connection to the

control (logic) circuit, and its input range is between 2.7 V to

5.5 V (3.0 V and 5.0 V compatible). V DD has an undervoltage

threshold. If the supply voltage to V DD drops below 2.0 V

(typical), then all the output of H-Bridges (OUT1A, OUT1B,

OUT2A, OUT2B) will become open (high impedance = Z).

When the supply voltage returns to a level that is above the

threshold voltage the H-Bridge outputs automatically resume

normal operation according to the established condition of

the input pins.

LOGIC INPUT CONTROL (IN1A, IN1B, IN2A, AND

IN2B)

These logic input pins control each H-Bridge output. For

example, IN1A logic HIGH = OUT1A HIGH; likewise, IN1B

logic HIGH = OUT1B HIGH. If both A and B inputs are HIGH,

then both A and B outputs are Z (refer to Table 5, Truth Table ,

INPUT ENABLE CONTROL (PSAVE)

The PSAVE input controls the functioning of the power

output stages (the H-Bridges). When it is set logic LOW, the

output stages are enabled and the H-Bridges function

normally. When it is set logic HIGH, the output stages are

disabled and all the outputs are opened (high impedance). In

this mode, the built-in low voltage detection circuit is disabled.

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

OUT2B)

These pins are the outputs of the power MOSFET

H-Bridges. OUT1 is from H-Bridge Channel 1, and OUT2

from H-Bridge Channel 2. These pins will typically connect to

an external load (step motor or brush DC motors).

MOTOR DRIVER POWER SUPPLY (VM1 AND VM2)

VM1 and VM2 carries the main supply voltage and current

into the power sections (the H-Bridges) of the IC. Both of

these pins are connected internally but they must be

connected together on the printed circuit board with as short

as possible traces. The input range is 2.7 V to 5.5 V.

POWER GROUND (PGND1 AND PGND2)

These two are the power ground pins that connect to the

power ground of the H-Bridges. The power grounds are for

higher current handling capability from loads and they must

be connected together on the PCB.

LOGIC GROUND (LGND)

LGND is the logic ground pin and its current handling level

is lower than the PGND.

17C724

Analog Integrated Circuit Device Data

8

Freescale Semiconductor

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