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RT8479B - Two-Stage Hysteretic LED Driver

Description

The RT8479B is a two-stage controller with dual MOSFETs and consists of a Boost converter (first stage) and a Buck converter (second stage).

Features

  • Two-Stage Topology (Boost + Buck).
  • Dual MOSFETs Inside.
  • Wide Input Voltage Range : 4.5V to 36V.
  • Excellent Power Factor.
  • Programmable Boost Output Voltage.
  • Independent Dual Stage Function.
  • Programmable LED current with ±5% LED Current Accuracy.
  • Input Under-Voltage Lockout Detection.
  • Thermal Shutdown Protection Ordering Information RT8479B Package Type SP : SOP-8 (Exposed Pad-Option 2) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Ric.

📥 Download Datasheet

Datasheet Details

Part number RT8479B
Manufacturer Richtek
File Size 135.63 KB
Description Two-Stage Hysteretic LED Driver
Datasheet download datasheet RT8479B Datasheet

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Full PDF Text Transcription

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® RT8479B Two-Stage Hysteretic LED Driver with Internal MOSFETs General Description The RT8479B is a two-stage controller with dual MOSFETs and consists of a Boost converter (first stage) and a Buck converter (second stage). The advantage of two-stage topology is highly compatible with ET (Electronic Transformer) and extremely high Power Factor performance in MR16 / AR111 lighting market fields applications. The first stage is a Boost converter for constant voltage output with inductor peak current over-current protection. The second stage is a Buck converter for constant output current by typical constant peak current regulation. The RT8479B is equipped with dual output gate drivers for internal power MOSFETs. The RT8479B is available in the SOP-8 (Exposed Pad) package.
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