1. General description
The SSL5257TE 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
10 W. The SSL5257TE is designed to achieve high power factor, phase-dimmable
applications.
The SSL5257TE 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 SSL5257TE 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 (10 /700 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
3. Applications
The SSL5257TE is intended for low-cost, non-isolated dimmable lighting applications
that work from single mains voltage.
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