NXP SSL5231

Description

The SSL5231T is a highly integrated, high-precision dimmable controller with an external MOSFET. It is intended to drive LED lamps in dimmable lighting applications up to 25 W. The SSL5231T is designed for high power factor, phase-dimmable applications.

The SSL5231T operates in Boundary Conduction Mode (BCM) with constant on-time control. It provides a constant output current control with good LED output current accuracy. Adaptive switching frequency gives freedom to choose the inductor, which enables the optimization of inductor size, efficiency and EMI.

The SSL5231T can start up and operate in switching mode directly from an external resistor without capacitor charge pump supply or auxiliary supply. This feature simplifies the VCC supply. So, a low-cost off-the-shelf inductor can be used, which provides flexibility in application design.

Features

• Supports most available dimming solutions
•  Deep dimming level
•  Flicker-free dimming
•  Low component count ensuring a compact solution and small, single layer
• Printed-Circuit Board (PCB) footprint
•  Excellent line regulation and load regulation and good LED output current accuracy
•  Efficient BCM operation with:
•  Minimal reverse recovery losses in freewheel diode
•  Zero Current Switching (ZCS) and Valley switching for turn-on of switch
•  Minimum inductance value and size required
•  High efficiency (up to 88 %)
•  Ultra low IC current during operation (< 165 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

• non-isolated dimmable lighting applications

More information

• Datasheet
• IC product information