DRV591

SLOS389A – NOVEMBER 2001– REVISED MAY 2002

±3A HIGHEFFICIENCY PWM POWER DRIVER

FEATURES

D ±3-A Maximum Output Current

D Low Supply Voltage Operation: 2.8 V to 5.5 V

D High Efficiency Generates Less Heat

D Over-Current and Thermal Protection

D Fault Indicators for Over-Current, Thermal

and Under-Voltage Conditions

D Two Selectable Switching Frequencies

D Internal or External Clock Sync

D PWM Scheme Optimized for EMI

D 9×9 mm PowerPAD Quad Flatpack

APPLICATIONS

D Thermoelectric Cooler (TEC) Driver

D Laser Diode Biasing

DESCRIPTION

The DRV591 is a high-efficiency, high-current power

amplifier

ideal

for

driving

a

wide

variety

of

thermoelectric cooler elements in systems powered

from 2.8 V to 5.5 V. PWM operation and low output

stage on-resistance significantly decrease power

dissipation in the amplifier.

The DRV591 is internally protected against thermal and

current overloads. Logic-level fault indicators signal

when

the

junction

temperature

has

reached

approximately

130

°C to allow for system-level

shutdown before the amplifier’s internal thermal

shutdown circuitry activates. The fault indicators also

signal when an over-current event has occurred. If the

over-current

circuitry

is

tripped,

the

DRV591

automatically resets (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

approximately 2.3 V/V.

1

µF

AVDD

AGND (Connect to PowerPAD)

ROSC

COSC

AREF

IN+

IN–

IN–

OUT–

PGND

PGND

PGND

PGND

PGND

PGND

OUT+

120 k

Ω

220 pF

1

µF

Shutdown Control

1 k

Ω

1 k

Ω

DC Control

Voltage

10

µF

VDD

10

µH

10

µF

10

µH

10

µF

1

µF

FAULT1

FAULT0

To TEC or Laser

Diode Anode

To TEC or Laser

Diode Cathode

1

µF

SHUTDOWN

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.

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Copyright

 2002, Texas Instruments Incorporated