DRV593 Datasheet, PDF (1/22 Pages) Texas Instruments – 3−A HIGH−EFFICIENCY PWM POWER DRIVER

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DRV593
DRV594
SLOS401A - SEPTEMBER 2002 REVISED - OCTOBER 2002
±3−A HIGH−EFFICIENCY PWM POWER DRIVER
FEATURES
DESCRIPTION
D Operation Reduces Output Filter Size and
Cost by 50% Compared to DRV591
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 Overcurrent and Thermal Protection
D Fault Indicators for Overcurrent, Thermal and
Undervoltage 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 Package
APPLICATIONS
D Thermoelectric Cooler (TEC) Driver
D Laser Diode Biasing
V_DD
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.
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+
DRV593
DRV594
IN -
SHUTDOWN
PWM
PGND
PGND
PGND
PGND
PGND
PGND
H/C
10 µH
To TEC or Laser
Diode Anode
10 µF
FAULT1
FAULT0
1 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