Description
The device is a highly integrated solution for SMPS applications, with an LED pilot-lamp requiring a dual control loop to perform CV (constant voltage) and CC (constant current) regulation. The IC allows very efficient LED pilot-lamp driving which helps to reduce the standby consumption of the SMPS. It integrates a voltage reference, two op-amps (with OR-ed open-drain outputs), a lowside current sensing circuit and an LED pilot-lamp driver pin implemented with an open-drain mosfet driven by square waveform with 12.5% duty cycle at 1 kHz that allows reducing LED consumption.

Features
■ Constant voltage and constant current control
■ Very efficient LED pilot-lamp driver
■ Wide operating VCC range (3.5 V - 36 V)
■ Low quiescent consumption: 250 µA
■ Voltage reference: 2.5 V
■ Voltage control loop accuracy ± 0.5%
■ Current sense threshold: 50 mV
■ Current control loop accuracy ± 4%
■ Low external component count
■ Open-drain output stage
■ SOT23-6L package

Applications
■ AC-DC adapter with LED pilot-lamp
■ Battery chargers with LED pilot-lamp
■ SMPS with LED pilot-lamp