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Preliminary Datasheet

Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681

Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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

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