DRV594VFPRG4.A中文资料德州仪器数据手册PDF规格书

1FEATURES

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.