SSL21084T(2013) 查看數據表（PDF） - NXP Semiconductors.

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SSL21084T
(Rev.:2013)

Mains driver LED driver IC

NXP Semiconductors. 

NXP Semiconductors

SSL21084T

Mains dimmable LED driver IC

8. Functional description

8.1 Introduction

The SSL21084T is a driver IC solution for small form factor mains phase-cut dimmable

LED lamps in isolated and non-isolated applications.

8.2 Converter operation

The converter in the SSL21084T is a Boundary Conduction Mode (BCM), peak current

controlled system. See Figure 3 for the basic application diagram. See Figure 4 for

relevant the waveforms.

This converter type operates at the boundary between continuous and discontinuous

mode. Energy is stored in inductor L each period that the switch is on. The inductor

current IL is zero when the MOSFET is switched on. The amplitude of the current build-up

in L is proportional to the voltage drop over the inductor and the time that the MOSFET

switch is on. When the MOSFET is switched off, the energy in the inductor is released

towards the output. The current then falls at a rate proportional to the value of VO. The

LED current ILED depends on the peak current through the inductor (SSL21084T

controlled) and on the dimmer angle while it is optimized for a high-power factor. A new

cycle is started once the inductor current IL is zero. This quasi-resonant operation results

in higher efficiency.

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Fig 3. SSL21084T basic application diagram



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SSL21084T

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 6 — 3 October 2013

© NXP B.V. 2013. All rights reserved.

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