DRV594| Datasheet

Datasheet preview, take a look at Datasheets before downloading (Data Sheet is available on manufacturer site)

www.ti.com

DRV593 DRV594
SLOS401A - SEPTEMBER 2002 REVISED - OCTOBER 2002

3-A HIGH-EFFICIENCY PWM POWER DRIVER
FEATURES D Operation Reduces Output Filter Size and
Cost by 50% Compared to DRV591

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.
VDD 10 uF 1 uF

D D D D D D D D D

3-A Maximum Output Current Low Supply Voltage Operation: 2.8 V to 5.5 V High Efficiency Generates Less Heat Overcurrent and Thermal Protection Fault Indicators for Overcurrent, Thermal and Undervoltage Conditions Two Selectable Switching Frequencies Internal or External Clock Sync PWM Scheme Optimized for EMI 9 9 mm PowerPAD Quad Flatpack Package

APPLICATIONS D Thermoelectric Cooler (TEC) Driver D Laser Diode Biasing

PWM

FREQ

PVDD

INT/EXT

PVDD

PWM

1 uF 120 k 220 pF 1 uF

10 uH PWM PGND PGND PGND

AVDD ROSC COSC AREF IN+ IN-

AGND (Connect to PowerPAD)

To TEC or Laser Diode Anode

DC Control Voltage 1 k 1 k

DRV593 DRV594

PGND PGND PGND H/C 10 uF

FAULT1

FAULT0

Shutdown Control

SHUTDOWN

PVDD

H/C

FAULT1 FAULT0 1 uF

H/C

To TEC or Laser Diode Cathode

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. 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.