OB3639B - Low THD Offline LED Lighting Controller

This page provides the datasheet information for the OB3639B, a member of the OB3639B-On Low THD Offline LED Lighting Controller family.

Datasheet Summary

Description

OB3639B is an offline LED lighting controller with high power factor, low THD and high constant current (CC) precision.

It can achieve low system cost for isolated lighting application by primary side control in a single stage converter.

Features

including programmable line voltage foldback , programmable line voltage OVP, NTC thermistor thermal foldback, LED open loop protection, LED short circuit protection, cycle-by-cycle current limiting, built-in leading edge blanking, VDD under voltage lockout (UVLO), etc. OB3639B is offered in SOP-8 package.

On-Bright

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Datasheet Details

Part number	OB3639B
Manufacturer	On-Bright
File Size	412.03 KB
Description	Low THD Offline LED Lighting Controller
Datasheet	OB3639B Datasheet
Additional preview pages of the OB3639B datasheet.

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Full PDF Text Transcription

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OB3639B High PF, Low THD Offline LED Lighting Controller GENERAL DESCRIPTION OB3639B is an offline LED lighting controller with high power factor, low THD and high constant current (CC) precision. It can achieve low system cost for isolated lighting application by primary side control in a single stage converter. It significantly simplifies the LED lighting system design by eliminating the secondary side feedback components and the opto-coupler. The proprietary CC control is used and the system can achieve high power factor with constant on-time control. Quasi-resonant (QR) operation and clamping frequency greatly improves system efficiency. The advanced start up technology is used to fast start up.

Published: May 25, 2025 |