NXP SSL5271T | Demoboard SSL5271DB1396

Description

The SSL5257TE is a highly integrated, high-precision buck-boost controller with aninternal MOSFET. It is intended to drive low-cost compact dimmable LED lamps up to10 W. The SSL5257TE is designed to achieve high power factor, phase-dimmableapplications.The SSL5257TE operates in Boundary Conduction Mode (BCM) with on-time control. Itregulates a constant output current over line and load variations. The wide switchingfrequency range makes it possible to choose an inductor, which enables the optimizationof inductor size, efficiency and EMI.The SSL5257TE can start up and operate in switching mode directly from the rectifiedmains. To provide a low-cost driver design, an off-the-shelf inductor can be used, whichprovides flexibility in application design.

Features

 Integrated MOSFET (10 /700 V) Supports most available dimming solutions Deep dimming level Flicker-free dimming Low component count ensuring a compact solution and small, single layerPrinted-Circuit Board (PCB) footprint Excellent line regulation and load regulation and good LED output current accuracy Hotaru current control Internal thermal foldback Efficient BCM operation with: Minimal recovery losses in freewheel diode Zero Current Switching (ZCS) and Valley switching for turn-on of switch Minimal inductance value and size required High efficiency (up to 90 %) Ultra low IC current during operation (< 200 A) Auto-recovery protections: UnderVoltage LockOut (UVLO) Cycle-by-cycle OverCurrent Protection (OCP) Internal OverTemperature Protection (OTP) Output OverVoltage Protection (OVP) Output Short Protection (OSP) Extended IC lifetime

Typical applications

• The SSL5257TE is intended for low-cost, non-isolated dimmable lighting applications

More information

• Datasheet
• IC product information