NXP SSL2109T

Description

The SSL2109 series is a range of high-voltage Integrated Circuits (IC) for driving 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 %) for non-dimmable high power factor solutions• High power factor >0.9 (application dependent)• Ease of integration and many protection features• Low electronic Bill Of Material (BOM)• Highly flexible IC for use in buck, buck/boost and flyback modes• Single inductor used for non-isolated configurations because of internaldemagnetization detection and dV/dt supplyThe IC is supplementary to the SSL21081/SSL21083 series but without an 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) current regulation and has many protection features including easy LED temperature feedback.

Features

- 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 flyback or buck product family.
• Controller-only which can drive an external MOSFET
• 
  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
• 
  SL2109AT: suitable for high power factor (>0.9) applications
• 
  Applicable in buck, buck/boost and flyback topologies
• 
  Direct PWM current regulation possible
• 
  Fast transient response through cycle-by-cycle current control:
• Negligible AC mains ripple in LED current and minimal total capacitance in low
• ripple configurations
• No over or undershoots in the LED current
• 
  Simple high input power factor solution (>0.9)
• 
  Internal Protection features:
• UnderVoltage LockOut (UVLO)
• Leading-Edge Blanking (LEB)
• OverCurrent Protection (OCP)
• Short-Winding Protection (SWP); SSL2109T only
• Internal OverTemperature Protection (OTP)
• Brownout protection
• Output Short Protection (OSP)
• 
  Low component count (see Figure 4) LED driver solution:
• No dim switch and high-side driver required for PWM current regulation
• Easy external temperature protection with a single NTC
• Option for soft-start function
• Compatible with wall switches with built-in indication light during standby
• 
  IC lifetime easily matches or surpasses LED lamp lifetime

Typical applications

• The SSL2109 is intended for compact LED lamps with accurate fixed current output for

More information

• Datasheet
• IC product information