Description

The CA3274 is a controlled current switch and may be used in general purpose switching applications that require specified maximum levels of current. The functional block diagram of the CA3274 is shown and a typical application circuit is shown in Figure 1. An internal emitter follower has 200mA of source drive output capability. The Control Input is a Schmitt trigger buffer amplifier for noise immunity in the environments typical of industrial and automotive control systems.

Features

• Drive-Current Limiting at Output

• Current-Sense Buffer and Reference

• 200mA Driver Current Capability

• Logic-Level Control Input

• Current Limiting Flag Output

• 50dB Minimum PSRR

• 5µs Typical Switch Time

• Separate Signal and Power Grounds

Applications

• Solenoid Switch Driver

• Relay Driver

• Lamp Control Switch

• Ignition Coil Pre-Driver

• Constant Current Driver

• Current Limiting Switch

• Fault Output Sense Appliance

• Power Supply Fault Mode Control