SSL2109T datasheet(1/19 Pages) NXP | GreenChip controller for LED lighting

1 / 19 page

General description

The SSL2109T is a high-voltage Integrated Circuit (IC), intended to drive LED lamps in

general lighting applications.

The main benefits of this IC include:

• Small Printed-Circuit Board (PCB) footprint, and compact solution

• High efficiency (up to 95 %)

• Ease of integration and many protection features

• Low electronic Bill Of Material (BOM)

The IC is supplementary to the SSL2108X series, but without internal switch. The IC

range has been designed to start up directly from the HV supply by an internal

high-voltage current source. Thereafter, the dV/dt supply is used with capacitive coupling

from the drain, or any other auxiliary supply. This functionality provides full flexibility in the

application design. An internal clamp limits the supply voltage.

The IC provides accurate output current control to within 5 % LED current accuracy. The

IC can be operated using Pulse-Width Modulation (PWM) dimming and has many

protection features including easy LED temperature feedback.

Features and benefits

 LED controller IC for driving strings of LEDs or high-voltage LED modules from a

rectified mains supply

 Part of a high-efficiency switch mode buck driver product family

 Controller that has power-efficient boundary conduction mode of operation with:

 No reverse recovery losses in freewheel diode

 Zero Current Switching (ZCS) for switch turn-on

 Zero voltage or valley switching for switch turn-off

 Minimal required inductance value and size

 Direct PWM dimming possible

 Fast transient response through cycle-by-cycle current control:

 Negligible AC mains ripple in LED current and minimal total capacitor value

 No over or undershoots in the LED current

 No binning on the LED forward voltage required

 Internal Protections:

 UnderVoltage LockOut (UVLO)

SSL2109T

GreenChip controller for LED lighting

Rev. 2 — 26 April 2012

Product data sheet

SSL2109T Datasheet(PDF) 1 Page - NXP Semiconductors