LYTSwitch-6 Family Flyback CV/CC LED Driver IC with Integrated High-Voltage Switch and FluxLink Feedback Product Highlights Highly Integrated, Compact Footprint Up to 94% efficiency across f ull load range SR FET Incorporates a multi-mode Quasi-Resonant (QR) / CCM / DCM flyback controller, high-voltage switch, secondary-side control and synchro- nous rectification driver Integrated FluxLink, HIPOT-isolated, feedback link Exceptional CV/CC accuracy, independent of transformer design or D V external components LYTSwitch-6 Adjustable accurate output current sense using external sense resistor Optional VOUT Primary Switch PowiGaN technology up to 100 W without heat sinks (LYT6079C Current and Controller Sense and LYT6070C) S BPP IS Secondary EcoSmart Energy Efficient Control IC Less than 30 mW no-load including line sense (without PF front end) PI-8375-112718 Designs using LYTSwitch-6 easily meet Energy Star and all global lighting energy efficiency regulations Figure 1. Typical Application/Performance. Low heat dissipation Advanced Protection / Safety Features Input line OV with auto-restart Output fault OVP/UVP with auto-restart Open SR FET gate detection Input voltage monitor with accurate brown-in Thermal foldback ensures that power continues to be delivered (lower level) at elevated temperatures Figure 2. High Creepage, Safety-Compliant InSOP-24D Package. Full Safety and Regulatory Compliance Reinforced insulation Isolation voltage >4000 VAC Output Power Table 100% production HIPOT compliance testing UL1577 and TUV (EN60950 and EN62368) safety approved 380 VDC / 277 VAC 15% 85-305 VAC 2 450 VDC 2,3 Green Package Product 1 1 1 Open Frame Open Frame Open Frame Halogen free and RoHS compliant LYT6063C/6073C 15 W 12 W 25 W Applications LYT6065C/6075C 30 W 25 W 40 W Isolated off-line LED driver Smart LED lighting LYT6067C/6077C 50 W 45 W 60 W High-voltage flyback post regulator LYT6068C 65 W 55 W Description 2 750 V PowiGaN Switch Product The LYTSwitch-6 series family of ICs dramatically simplifies the LYT6078C 75 W 65 W 90 W development and manufacturing of off-line LED drivers, particularly those in compact enclosures or with high efficiency requirements. LYT6079C 85 W 75 W 100 W The LYTSwitch-6 architecture is revolutionary in that the devices LYT6070C 95 W 85 W 110 W incorporate both primary and secondary controllers, with sense Table 1. Output Power Table. elements and a safety-rated feedback mechanism into a single IC. Notes: Close component proximity and innovative use of the integrated 1. Minimum continuous power in a typical non-ventilated and PCB size measured at 40 C ambient. Max output power is dependent on the design. With communication link, FluxLink, permit accurate control of a secondary- condition that package temperature must be < 125 C. side synchronous rectification MOSFET with Quasi-Resonant switching 2. Package: InSOP-24D. of primary integrated high-voltage switch to maintain high efficiency 3. LYT606x 650 V MOSFET, LYT607x 725 V MOSFET. across the entire load range. www.power.com June 2020 This Product is Covered by Patents and/or Pending Patent Applications. FWD SR GND BPS FBLYTSwitch-6 DRAIN UNDER/OVER PRIMARY BYPASS (D) INPUT VOLTAGE (V) (BPP) PRIMARY BYPASS REGULATOR ENABLE ENABLE FAULT AUTO-RESTART PRIMARY LINE COUNTER GATE BYPASS PIN INTERFACE RESET BPP/UV UNDERVOLTAGE PRIMARY BPP/UV BYPASS PIN PRIM-CLK CAPACITOR SELECT AND UV/OV CURRENT VSHUNT OSCILLATOR/ V LIMIT ILIM V GATE BP+ TIMERS JITTER t t ON(MAX) OFF(BLOCK) THERMAL GATE SHUTDOWN GATE PRIM/SEC FAULT SecREQ OV/UV BPP From SecPulse SenseFET Secondary PRIM/SEC Power Controller Q S MOSFET Q R SEC- RECEIVER DRIVER LATCH CONTROLLER BPP/UV t OFF(BLOCK) LEB I S PRIM-CLK ILIM + PRIMARY OVP LATCH-OFF/ LATCH/ V - AUTO-RESTART ILIM AUTO-RESTART t ON(MAX) PI-8044g-041819 SOURCE (S) Figure 3. Primary Controller Block Diagram. FORWARD SYNCRONOUS RECTIFIER DRIVE OUTPUT VOLTAGE (FWD) (SR) (VOUT) SR CONTROL REGULATOR FORWARD V BPS INH ENABLE SECONDARY BPS UV VOUT SR BYPASS (BPS) DETECTOR S Q V BPS(UVLO)(TH) + Q R SR THRESHOLD QR HANDSHAKE/ SECONDARY FAULT DETECTION LATCH / CONTROL INH AUTO-RESTART DCM To FEEDBACK Primary (FB) Receiver FEEDBACK INH DRIVER VREF QR FEEDBACK COMPENSATION Ts MAX THERMAL t OFF(MIN) FOLDBACK t OSCILLATOR/ SECINH(MAX) TIMER t SS(RAMP) SECONDARY ISENSE GROUND (IS) (GND) PI-8045h-080619 Figure 4. Secondary Controller Block Diagram. 2 Rev. K 06/20 www.power.com - + - + - + - +