DRV590

SLOS365A – AUGUST 2001 – REVISED AUGUST 2002

1.2-A HIGH-EFFICIENCY PWM POWER DRIVER

1

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FEATURES

to 5.5 V

Junior

 Packages

APPLICATIONS

DESCRIPTION

The DRV590 is a high-efficiency power amplifier ideal

for driving a wide variety of thermoelectric cooler

elements in systems powered from 2.7 V to 5.5 V. PWM

operation

and

low

output

stage

on-resistance

significantly decrease power dissipation in the amplifier.

The DRV590 is internally protected against over

temperature conditions and current overloads due to

short

circuits.

The

over

temperature

protection

activates at a junction temperature of 190

°C and will

deactivate once the temperature is less than 130

°C. If

the overcurrent circuitry is tripped, the amplifier will

automatically reset after 3–5 ms.

The gain of the DRV590 is controlled by two input

terminals, GAIN1 and GAIN0. The amplifier may be

configured for a gain of 6, 12, 18, and 23.5 dB.

NC

IN+

IN–

SHUTDOWN

GAIN0

GAIN1

OUT+

NC

PGND

NC

AREF

AGND

COSC

ROSC

OUT–

NC

PGND

C6

C7

C5

L1

L2

C1

C2

C9

220 pF

R6

C4

R5

C3

R4

J2

J3

R3

J1

R2

R1

J6

OUT–

J7

OUT+

J9

GND

J8

VDD

J4

IN+

J5

IN– (VCOM)

C8

120 k

Ω

120 k

Ω

1 k

Ω

1 k

Ω

120 k

Ω

1

µF

10

µF

10

µH

10

µF

10

µH

10

µF

1

µF

1

µF

10

µF

120 k

Ω

1

µF

PVDD

VDD

PVDD

J8

VDD

Typical Circuit Schematic for Driving a Thermoelectric Cooler Element

This document contains information on products in more than one phase

of development. The status of each device is indicated on the page(s)

specifying its electrical characteristics.

PowerPAD and MicroStar Junior are trademarks of Texas Instruments.

Copyright

 2002, Texas Instruments Incorporated

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.