Demoboard SSL5021BDB1211(UM10877)

Compact low-ripple buck LED driver IC

Topologie: Buck
Eingangsspannung (min.): 100.00 V
Eingangsspannung (max.): 100.00 V
Ausgang 1: 40.00 V / 0.210 A

Erstveröffentlichung am 09.03.2015, Version 2 vom


The SSL5021BTS is a highly integrated, high-precision, non-isolated MOSFET/bipolarbuck controller. It is intended to drive LED lamps in universal mains non-dimmable lightingapplications up to 25 W. The SSL5021BTS is designed for low-ripple applications.The SSL5021BTS operates in Boundary Conduction Mode (BCM) with on-time regulation.Operating in BCM provides a constant output current control with high accuracy. Adaptiveswitching frequency gives freedom to choose the inductor, which enables the optimizationof inductor size, efficiency and EMI.The SSL5021BTS starts up and operates in switching mode directly from an externalresistor without dV/dt supply or auxiliary supply. This feature simplifies the VCC supply. Itallows a low-cost off-the-shelf inductor to be used, providing flexibility in applicationdesign.The SSL5021BTS comes in a compact TSOP6 package.The SSL5031BTS is suitable for high power factor/Low-THD applications with ahigh-temperature foldback function. The SSL5031CTS is best for high powerfactor/low-THD applications without a high-temperature foldback function.


  • Driving LED strings from a rectified mains supply, low-ripple (< ±5 %)
  • Small electronic Bill of Materials (BOM) enabling a compact solution and a small,single layer Printed-Circuit Board (PCB) footprint
  • Excellent line and load regulation and LED output current accuracy
  • Efficient BCM operation with: Minimal reverse recovery losses in freewheel diode
  • Zero Current Switching (ZCS) and valley switching for switch turn-on
  • Minimal inductance value and size required
  • High efficiency (up to 91 %)
  • Ultra low IC current during operation (< 150 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)
  • Thermal foldback protection via a single PTC or NTC resistor
  • Compatible with wall switches with built-in standby indicator lights (Hotaru switch)
  • Extended IC lifetime


  Artikel Nr. SPEC Produktserie L
RDC max.
RDC typ.
7447462681 PDF WE-TI Tonneninduktivität 680 0.25 3.7 3.094 2.4