This document provides preliminary information on a new product that is currently in development or undergoing evaluation. Details may change. The product features multipower BCD technology, load-dependent current-mode control, on-board high-voltage start-up, improved standby function, and low quiescent current, among others.
The L6668 is a current-mode primary controller IC designed to build single-ended converters. It operates at a fixed frequency under heavy loads and utilizes frequency foldback and burst-mode operation at light loads to reduce mains consumption and meet energy saving regulations. The device includes an on-board high-voltage start-up generator and an interface for PFC controllers to turn off the pre-regulator at light loads.
Key features include a programmable soft-start, slope compensation for stable operation at duty cycles greater than 50%, and a latched disable function for over-voltage or over-temperature protection. The IC drives the power MOSFET with a totem pole gate driver capable of 800 mA peak current, with internal clamping and UVLO pull-down.
| Quiescent Current (After turn-on) | 2 mA |
|---|---|
| Supply Voltage Operating Range | 9.4 to 22 V |
| Turn-on Threshold | 12.5 to 14.5 V |
| Maximum Duty Cycle | 75 % |
The quiescent current after turn-on is typically 2.5 mA, with a minimum of 2 mA.
The operating supply voltage range is from 9.4 V to 22 V.
Yes, it enters a special burst-mode operating mode at very light loads to keep consumption low.