SSL2109T Datasheet, PDF (1/19 Pages) NXP Semiconductors – GreenChip controller for LED lighting

SSL2109T
GreenChip controller for LED lighting
Rev. 2 — 26 April 2012
Product data sheet
1. 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.
2. 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)