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OB3639B - Low THD Offline LED Lighting Controller

Download the OB3639B datasheet PDF. This datasheet also covers the OB3639B-On variant, as both devices belong to the same low thd offline led lighting controller family and are provided as variant models within a single manufacturer datasheet.

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.

Key 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.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (OB3639B-On-Bright.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number OB3639B
Manufacturer On-Bright
File Size 412.03 KB
Description Low THD Offline LED Lighting Controller
Datasheet download datasheet OB3639B Datasheet

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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
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.