SSL5021BTS1X NXP

SSL5021BTS Compact low-ripple buck LED driver IC Rev. 2 11 March 2015 Product data sheet 1. General description The SSL5021BTS is a highly integrated, high-precision, non-isolated MOSFET/bipolar buck controller. It is intended to drive LED lamps in universal mains non-dimmable lighting applications 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. Adaptive switching frequency gives freedom to choose the inductor, which enables the optimization of inductor size, efficiency and EMI. The SSL5021BTS starts up and operates in switching mode directly from an external resistor without dV/dt supply or auxiliary supply. This feature simplifies the V supply. It CC allows a low-cost off-the-shelf inductor to be used, providing flexibility in application design. The SSL5021BTS comes in a compact TSOP6 package. The SSL5031BTS is suitable for high power factor/Low-THD applications with a high-temperature foldback function. The SSL5031CTS is best for high power factor/low-THD applications without a high-temperature foldback function. 2. Features and benefits 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)SSL5021BTS NXP Semiconductors Compact low-ripple buck LED driver IC 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 3. Applications The SSL5021BTS is intended for low-cost, non-isolated LED lighting applications with accurate fixed current output up to 25 W for single mains or universal mains voltage (90 V (AC) to 277 V (AC)). 4. Quick reference data Table 1. Quick reference data Symbol Parameter Conditions Min Typ Max Unit 1 V supply voltage operating range 9.5 - 16 V CC R on-state resistance of internal switch DSon T =25 C - 0.75 0.90 j T =125 C- 1.20- j I input current in pin SW triangle wave 2- +2 A I(SW) duty cycle < 20 % V input voltage on pin current limited at 0.4 - +22 V I(SW) SW 8.8 mA internal switch off 1 An internal clamp sets the supply voltage. The current into the VCC pin must not exceed the maximum I VCC value (see Table 4). 5. Ordering information Table 2. Ordering information Type number Package Name Description Version SSL5021BTS TSOP6 plastic surface-mounted package 6 leads SOT457 SSL5021BTS All information provided in this document is subject to legal disclaimers. NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 2 11 March 2015 2 of 20