HCPL-3760-000E RF Integrated Circuits Logic Output Optocouplers AC/DC to Logic

Description

The HCPL-0370/3700 and HCPL-3760 are voltage/cur- rent threshold detection optocouplers. The HCPL-3760 is a low-current version of the HCPL-0370/3700. To obtain lower current operation, the HCPL-3760 uses a high-e - ciency AlGaAs LED which provides higher light output at lower drive currents. The devices utilize threshold sens- ing input bu er ICs which permit control of threshold levels over a wide range of input voltages with a single external resistor.

The input bu er incorporates several features: hysteresis for extra noise immunity and switching immunity, a di- ode bridge for easy use with ac input signals, and inter- nal clamping diodes to protect the bu er and LED from a wide range of over-voltage and over-current transients. Because threshold sensing is done prior to driving the LED, variations in optical coupling from the LED to the detector will have no e ect on the threshold levels.

Features

• Standard (HCPL-0370/3700) and low input current (HCPL-3760) versions

• AC or DC input
• Programmable sense voltage
• Hysteresis
• Logic compatible output
• Thresholds guaranteed over temperature
• Thresholds independent of LED optical parameters

• Recognized under UL 1577 and CSA approved for dielectric withstand proof test voltage of 3750 Vac, 1 minute

Applications

• Limit switch sensing
• Low voltage detector
• AC mains and DC link voltage detection

• Relay contact monitor
• Relay coil voltage monitor
• Current sensing
• Microprocessor interfacin