1. general description the SSL21084AT is a high-voltage integrated circuit (ic) for driving retrofit led lamps in general lighting applications. it enables the implementation of a very compact low-cost system solution. the ic has an integrated internal hv switch and work as boundary conduction mode (bcm) buck converter. the SSL21084AT is supplied by a start-up bleeder resistor, a dv/dt supply using cap a citive coupling from the drain or any othe r auxiliary supply. the ic supply current is low. an internal clamp limits the supply voltage. the ic has accurate output current cont r o l and can be operated using pulse-width modulation (pwm) dimming. in addition, several protection features are available such as easy external temperature feedback. the main benefits of this ic include: ? small printed-circuit board (pcb) footprint and compact solution ? high efficiency (up to 90 %) for non-dimmable high power factor solutions ? high power factor (>0.9) ? ease of integration and many protection features ? low electronic bill of materials (bom) ? mains phase-cut dimmable using external components ? highly flexible ic for use in buck, buck/boost mode ? single inductor used for non-isolated configurations because of internal demagnetization detection and dv/dt supply the SSL21084AT is designed to start up directly from the hv supply using an internal h i gh-voltage current source. an internal clamp limits the supply voltage. SSL21084AT mains dimmable led driver ic rev. 6 ? 3 october 2013 product data sheet
SSL21084AT all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 2 of 21 nxp semiconductors SSL21084AT mains dimmable led driver ic 2. features and benefits ? led driver ic for driving strings of leds or high-voltage led modules from a rectified mains supply ? po wer-efficient boundary conduction mode operation with: ? no reverse recovery loss es in fre ewheel diode ? ze ro-current switching (z cs) for switch turn-on ? zero-volt a ge or valley switching for switch turn-off ? min imal required inductance value and size ? fa st transient response through cycle-by-cycle current control: ? no over shoot or undershoot in the led current ? sim ple high input power factor solution (>0.9) ? inter nal protection features: ? und ervoltage lockout (uvlo) ? l eading-edge blanking (leb) ? ove rcurrent protection (ocp) ? in ternal overtemperature protection (otp) ? br ownout protection ? output shor t protection (osp) ? ma ins phase cut dimmable led driver solution: ? support s both lead ing-edge and tra iling-edge dimmers ? ea sy external temperature protection with a single ntc ? open output protection using external components ? comp atible with wall swit ch es with built-in indication light during standby ? ic lifetime easily matc hes or surp asses led lamp lifetime ? inp ut current distributed evenly over the ph ase, reducing required output capacitor size and bleeder dissipation 3. applications the SSL21084AT is intended for mains dimmable compact led lamps for single mains input voltages. mains input voltages include 100 v (ac), 120 v (ac) and 230 v (ac).
SSL21084AT all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 3 of 21 nxp semiconductors SSL21084AT mains dimmable led driver ic 4. quick reference data [1] an internal clamp sets the supply voltage. the current into the vcc pin must not exceed the maximum i dd value (see table 4 ). 5. ordering information table 1. quick reference data symbol parameter conditions min typ max unit v cc supply voltage operating range [1] 8 - 16 v r dson drain-source on-state resistance t j = 25 ?c 4 5 6 ? t j = 125 ?c 6 7.5 9 ? i drain current on pin drain ? 1 - +1 a v drain voltage on pin drain ? 0.4 - +600 v f conv conversion frequency - 100 - khz table 2. ordering information type number package name description version SSL21084AT so12 plastic small package outline body; 12 leads; body width 3.9 mm sot1196-1
SSL21084AT all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 4 of 21 nxp semiconductors SSL21084AT mains dimmable led driver ic 6. block diagram fig 1. SSL21084AT block diagram d d d - ) ( 7 + 9 9 & |