High-current high-speed operational amplifier

The OPA561 is a low-cost, high-current

operational amplifier capable of driving up to 1.2-A pulses into reactive loads. This

monolithic integrated circuit provides high reliability in demanding line-carrier

communications, laser diode drivers, and motor-control applications. The high slew rate

provides 1 MHz of full-power bandwidth and excellent linearity.

For design

flexibility, the OPA561 operates from either a single supply in the range of 7 V to 15 V or

dual power supplies of ±3.5 V to ±7.5 V. In single-supply operation, the input common-mode

range extends below ground. At maximum output current, a wide output swing provides a 12

V PP capability with a nominal 15‑V supply.

The OPA561 is internally protected against

overtemperature conditions and current overloads. In addition, the OPA561 is designed to

provide an accurate, user-selected, current limit. The current limit can be adjusted from

0.2 A to 1.2 A with a low-power resistor or potentiometer, or DAC (digital-to-analog

converter). The high-speed characteristics of the current control loop provide accuracy,

even under pulsed-load conditions.

The enable and status (E/S) pin performs two

functions: the pin can be monitored to determine if the device is in thermal shutdown

(active low), and can also be forced low to disable the output, thus disconnecting the load.

The OPA561 is available in a miniature

HTSSOP-20 PowerPAD integrated circuit package. This surface-mount package is thermally

enhanced and has a very low thermal resistance. Operation is specified over the industrial

temperature range of 0°C to 125°C.