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DRV591VFP-DRV591VFPG4-DRV591VFPR
High-Efficiency PWM Power Driver
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SLOS389A – NOVEMBER 2001– REVISED MAY 2002
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FEATURES ±3-A Maximum Output Current
Low Supply Voltage Operation: 2.8 V to 5.5 V High Efficiency Generates Less Heat Over-Current and Thermal Protection Fault Indicators for Over-Current, Thermal
and Under-Voltage Conditions Two Selectable Switching Frequencies Internal or External Clock Sync PWM Scheme Optimized for EMI 9×9 mm PowerPAD Quad Flatpack
APPLICATIONS Thermoelectric Cooler (TEC) Driver Laser Diode Biasing
DESCRIPTIONThe 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.
1 kΩ
1 kΩ
DC Control
Voltage
VDD
To TEC or Laser
Diode Anode
To TEC or Laser
Diode Cathode
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