DRV593

DRV594

SLOS401A - SEPTEMBER 2002 REVISED - OCTOBER 2002

±3−A HIGH−EFFICIENCY PWM POWER DRIVER

FEATURES

Cost by 50% Compared to DRV591

Undervoltage Conditions

APPLICATIONS

DESCRIPTION

The

DRV593

and

DRV594

are

high-efficiency,

high-current power amplifiers ideal for driving a wide

variety of thermoelectric cooler elements in systems

powered from 2.8 V to 5.5 V. The operation of the device

requires only one inductor and capacitor for the output

filter,

saving

significant

printed-circuit

board

area.

Pulse-width modulation (PWM) operation and low output

stage

on-resistance

significantly

decrease

power

dissipation in the amplifier.

The DRV593 and DRV594 are internally protected against

thermal and current overloads. Logic-level fault indicators

signal when the junction temperature has reached

approximately 115

°C to allow for system-level shutdown

before the amplifier’s internal thermal shutdown circuitry

activates. The fault indicators also signal when an

overcurrent event has occurred. If the overcurrent circuitry

is tripped, the devices automatically reset (see application

information section for more details).

The PWM switching frequency may be set to 500 kHz or

100 kHz depending on system requirements. To eliminate

external components, the gain is fixed at 2.3 V/V for the

DRV593. For the DRV594, the gain is fixed at 14.5 V/V.

1

µF

AVDD

AGND (Connect to PowerPAD)

ROSC

COSC

AREF

IN+

IN -

IN -

H/C

PGND

PGND

PGND

PGND

PGND

PGND

PWM

120 k

Ω

220 pF

1

µF

Shutdown Control

1 k

Ω

1 k

Ω

DC Control

Voltage

10

µF

10

µH

1

µF

FAULT1

FAULT0

To TEC or Laser

Diode Anode

To TEC or Laser

Diode Cathode

1

µF

SHUTDOWN

DRV593

DRV594

10

µF

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

www.ti.com

Copyright

 2002, Texas Instruments Incorporated