DRV591VFP.B中文资料德州仪器数据手册PDF规格书

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

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.