The SSL5255TE is a highly integrated, high-precision buck-boost controller with an
internal MOSFET. It is intended to drive low-cost compact dimmable LED lamps up to
12 W. The SSL5255TE is designed to achieve high power factor, phase-dimmable
applications.
The SSL5255TE operates in Boundary Conduction Mode (BCM) with on-time control. It
regulates a constant output current over line and load variations. The wide switching
frequency range makes it possible to choose an inductor, which enables the optimization
of inductor size, efficiency and EMI.
The SSL5255TE can start up and operate in switching mode directly from the rectified
mains. To provide a low-cost driver design, an off-the-shelf inductor can be used, which
provides flexibility in application design.
2. Features and benefits
? Integrated MOSFET (5 ?/450 V)
? 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
? 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
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