General Description

The iML8674 is a two step LED current controller with line regulation compensation function across wide supply voltage range and with active load controller for phase cut dimmable function. It can drive two external N- channel power MOSFETs to regulate the current flowing through an LED string and providing the holding current for the phase cut dimmer.

The application of the iML8674 is configured in serial with an LED string. It works as a constant current sink with over voltage protection (OVP), over temperature protection (OTP), and line regulation compensation function. Additional active load function is included to improvide the phase-cut dimming performance. It is suitable for the applications adopting rectified periodical AC voltage source.

The PCB layout is also very flexible to meet various shape requirements. It is especially suitable for replacing incandescent light bulb and linear type fluorescent lamp.

Features

Device

- Two current steps and active load control from single device.

- Excellent system power regulation over AC line variation range.

- 6V to 76V chip supply voltage range.

- Over temperature protection.

- Over voltage protection.

- Single board LED lighting solution available.

- DFN-3x3-10L packages.

System

- All solid state components.

- No electrolytic capacitor required.

- Scalable architecture allows optimization of performance vs. cost.

- Driver-on-board and chip-on-board design solution available which minimize process flow and assembly cost.

- High PF and Low THD performance.

- Flexible PCB layout options.

-  Active load for phase-cut dimming operation

Applications

A series LED bulbs

Candelabra LED bulbs

LED light tube

LED down lights

LED ceiling lamps

AC LED lighting engines

Ordering Information