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AF1821 - Primary Side Control Offline LED Controller

Download the AF1821 datasheet PDF. This datasheet also covers the AF1821-Alfa variant, as both devices belong to the same primary side control offline led controller family and are provided as variant models within a single manufacturer datasheet.

General Description

The AF1821 is a TRIAC dimmable, primary-side-control offline LED lighting controller which can achieve high power factor and flicker-free TRIAC dimming output LED current for an isolate lighting application in a single stage converter.

Key Features

  • over-voltage protection, short-circuit protection, cycle-by-cycle current limit, VCC UVLO and auto-restart over temperature protection. The AF1821 is available in a small SOP-8 package. Features Real Current Control Without Secondaryfeedback Circuit Flicker-free Phase-controlled TRIAC Dimming Accurate Constant Current Output Boundary Conduction Mode Operation Ultra-low (10µA) Start Up Current Low (1mA) Quiescent Current Input UVLO Cycle-by-cycle Current Limit Over-voltage Protection Short-circu.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (AF1821-Alfa-MOS.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number AF1821
Manufacturer Alfa-MOS
File Size 1.03 MB
Description Primary Side Control Offline LED Controller
Datasheet download datasheet AF1821 Datasheet

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Part Number Description
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
Alfa-MOS Technology AF1821 TRIAC Dimming, Primary Side Control Offline LED Controller with Active PFC General Description The AF1821 is a TRIAC dimmable, primary-side-control offline LED lighting controller which can achieve high power factor and flicker-free TRIAC dimming output LED current for an isolate lighting application in a single stage converter. The proprietary real current control method can control the LED current accurately from the primary side information. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the photo coupler. AF1821 can realize flicker-free TRIAC dimming. And it integrates power factor correction function and works in boundary conduction mode for reducing the MOSFET switching losses.