Diodes AP1681 - Manual

Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
1
General Description
The AP1681 is a powerful high performance AC/DC
power supply controller for dimmable LED lighting
applications. The device uses Pulse Frequency
Modulation (PFM) technology to regulate output
current according to the wall dimmer conduct angle.
The AP1681 achieves wide dimming range without
visible flicker and is compatible with diverse
dimmers.
The AP1681 features low start-up current, low
operation current and high efficiency. It also has rich
protection functions including over voltage, short
circuit, over current and over temperature protections.
The AP1681 is available in SOIC-8 package.
Features
• Primary Side Control for Output Current
Regulation Without Opto-coupler and Secondary
CV/CC Control Circuitry
• Adjustable Full Brightness and Full Dimming
Setting
• Wide Dimming Range From 100% to 1%, Down
to Full Darkness
• Adjustable Dimming Curve for Human Eye
Sensitivity
• No Visible Flicker
• Connectivity with Analog / Digital / Hybrid
Dimming Mode
• Built-in Acceleration Start
• Adjustable Soft-start Timing
• CV Open-load Regulation and Reload Detection
• Over Voltage and Short Circuit Protection
• Over Temperature Protection
• Over Current Protection
• Maximum Switch On-time Protection
Applications
•
Dimmable LED Driver Suit for Leading-edge
Dimmer, Trailing-edge Dimmer, R Type, R-C
Type or R-L Type Dimmer
Figure 1. Package Type of AP1681
SOIC-8