DESCRIPTION

· This circuit is a switch mode current regulator with two modes: In-rush and Holding.

· It operates within a wide supply voltage range of 8 to 35V DC.

· The In-rush current occurs in the first 64 ms of each on/off cycle, with the rise time dependent on the coil's resistance and inductance.

· The Hold-current is a partition of the In-rush current fixed by the ratio between V1 and V2.

· The circuit includes a control pin for enabling and disabling the gate control output for the external power MOS.

· The MOS transistor must be chosen according to the supply voltage range and the current flowing through the solenoid.

FEATURES

· Wide supply voltage range: 8 to 35V DC.

· Built-in gate drive voltage clamp type: 11V.

· Logic controlled enabling circuit.

· Digital in-rush timer.

· Built-in power-on reset.

· Internally trimmed timing oscillator.

· No external timing capacitors needed.

· Fixed in-rush/hold current ratio.

· Low drop current sensing resistor.

· Integrated filter in the feedback loop (time constant of 2µs typical).

· SO-8 package.

APPLICATIONS

· Solenoid control in various electronic systems.

· Switch mode current regulation in power management circuits.

· Systems requiring controlled in-rush and hold current modes.