DRV591_14 Datasheet, PDF (1/22 Pages) Texas Instruments – 3-A HIGH-EFFICIENCY PWM POWER DRIVER

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DRV591
SLOS389A – NOVEMBER 2001– REVISED MAY 2002
±3ĆA HIGHĆEFFICIENCY 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.
VDD
10 µF
1 µF
1 µF
120 kΩ
DC Control
Voltage
1 kΩ
220 pF
1 µF
1 kΩ _{Shutdown Control}
AVDD
AGND (Connect to PowerPAD)
ROSC
COSC
AREF
IN+
IN–
SHUTDOWN
OUT+
PGND
PGND
PGND
PGND
PGND
PGND
OUT–
10 µH
10 µF
To TEC or Laser
Diode Anode
FAULT1
FAULT0
1 µF
10 µH
10 µF
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.
Copyright  2002, Texas Instruments Incorporated