SSL5231BT/1J

SSL5231T Mains dimmable buck-boost LED driver IC Rev. 3 — 11 March 2015 Product data sheet 1. General 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. 2. Features and benefits         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 SSL5231T NXP Semiconductors Mains dimmable buck-boost LED driver IC 3. Applications  The SSL5231T is intended for low-cost, non-isolated dimmable lighting applications that work from single mains voltage. 4. Quick reference data Table 1. Quick reference data Symbol Parameter Conditions VCC supply voltage operating range RDSon on-state resistance source-switch II(SW) input current on pin SW duty cycle < 20 % VI(SW) input voltage on pin SW current limited at 8.8 mA; internal switch-off [1] Min Typ Max Unit 9.9 - 16 V Tj = 25 C - 0.81 -  Tj = 125 C - 1.2 -  2 - +2 A 0.4 - +22 V [1] An internal clamp sets the supply voltage. The current into the VCC pin must not exceed the maximum IVCC value (see Table 4). 5. Ordering information Table 2. Ordering information Type number SSL5231T SSL5231T Product data sheet Package Name Description Version SO8 plastic surface-mounted package; 8 leads SOT96-1 All information provided in this document is subject to legal disclaimers. Rev. 3 — 11 March 2015 © NXP Semiconductors N.V. 2015. All rights reserved. 2 of 17 SSL5231T NXP Semiconductors Mains dimmable buck-boost LED driver IC 6. Block diagram 9&&  9$//(< '(7(&7,21 '(0293 6833/