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DRV591
SLOS389A 鈥?NOVEMBER 2001鈥?REVISED MAY 2002
鹵3
A HIGH EFFICIENCY PWM POWER DRIVER
FEATURES
D
D
D
D
D
D
D
D
D
鹵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脳9 mm PowerPAD錚?Quad Flatpack
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擄C to allow for system-level
shutdown before the amplifier鈥檚 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
碌F
1
碌F
APPLICATIONS
D
Thermoelectric Cooler (TEC) Driver
D
Laser Diode Biasing
OUT+
OUT+
FREQ
PVDD
PVDD
INT/EXT
PVDD
OUT+
1
碌F
120 k鈩?/div>
220 pF
1
碌F
10
碌H
OUT+
PGND
PGND
PGND
PGND
PGND
PGND
OUT鈥?/div>
10
碌F
AVDD
ROSC
COSC
AREF
IN+
IN鈥?/div>
AGND (Connect to PowerPAD)
To TEC or Laser
Diode Anode
DC Control
Voltage
1 k鈩?/div>
1 k鈩?/div>
FAULT1
FAULT0
Shutdown Control
SHUTDOWN
PVDD
PVDD
PVDD
OUT鈥?/div>
OUT鈥?/div>
OUT鈥?/div>
FAULT1
FAULT0
1
碌F
10
碌H
10
碌F
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
錚?/div>
2002, Texas Instruments Incorporated
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