DRV593_15 Datasheet, PDF (1/27 Pages) Texas Instruments – 3−A HIGH−EFFICIENCY PWM POWER DRIVER

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Actual Size
9mm Square
DRV593
DRV594
SLOS401C – OCTOBER 2002 – REVISED JULY 2010
±3-A HIGH-EFFICIENCY PWM POWER DRIVER
Check for Samples: DRV593, DRV594
FEATURES
1
•2 Operation Reduces Output Filter Size and Cost
by 50% Compared to DRV591
• ±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
• Thermoelectric Cooler (TEC) Driver
• Laser Diode Biasing
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 128°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.
V_DD
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
1
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.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2002–2010, Texas Instruments Incorporated