LYT0002/0004-0006 LYTSwitch-0 Off-Line Low Power LED Driver IC Family Lowest Component Count, Off-Line Switcher IC for Non-Isolated LED Lighting Applications Product Highlights High power factor meeting EU and USA requirements FB BP Very low component count D S Frequency jitter reduces EMI LYTSwitch-0 No bias supply or transformer required V IN Cost-Effective LED driver The LYTSwitch-0 family parts are a highly integrated combination of controller, driver and switching power MOSFET that enable low component-count, non-isolated switching topologies for highly PI-6810-060613 (a) cost competitive LED lighting applications. 66 kHz operation together with frequency jittering insures a very FB BP low-cost EMI filter. Less than <50 ms start-up time turn-on without overshoot, improves end user experience no delay. D S + LYTSwitch-0 V Power Factor Correction IN Allows designs that easily meet European and North American standards for PFC in consumer lighting applications. PI-6819a-060613 (b) Tight CC Performance Figure 1. Typical Application Schematic (a) Buck, (b) Buck-Boost. Accurate current limit with tight line and load regulation that is stable over a wide temperature range makes the LYTSwitch-0 1 Output Current Table ideal for LED lighting applications. 230 VAC 15% 85-308 VAC 6 4,5 Comprehensive Protection Product PF 2 3 2 3 MDCM CCM MDCM CCM Integrated auto-restart for short-circuit, open-circuit and open- High 45 mA 65 mA 30 mA 40 mA loop faults as well as a high threshold over-temperature LYT0002D/P protection feature (min. 135 C) with automatic restart provide Low 63 mA 80 mA 63 mA 80 mA extensive protection at no additional cost. High 85 mA 110 mA 50 mA 70 mA LYT0004D/P Low 98 mA 139 mA 98 mA 139 mA LYTSwitch-0 Supports Different LED Applications Flyback, buck, buck-boost and boost architectures are all High 100 mA 140 mA 60 mA 90 mA LYT0005D/P supported by the LYTSwitch-0 family. The 700 V switching power Low 120 mA 170 mA 120 mA 170 mA MOSFET supports an input voltage range of 85 VAC to 308 VAC. High 165 mA 220 mA 100 mA 140 mA LYT0006D/P Description Low 200 mA 280 mA 200 mA 280 mA The LYTSwitch-0 family is specifically designed for low cost Table 1. Output Current Table. LED bulb replacement applications. LYTSwitch-0 devices Notes: 1. Typical output current in a non-isolated buck converter. See Key Applications integrate a 700 V power MOSFET, oscillator, simple ON/OFF Considerations section for more information. control scheme, a high-voltage switched current source, 2. MDCM mostly discontinuous mode. frequency jittering, cycle-by-cycle current limit and thermal 3. CCM continuous conduction mode. 4. PF high: >0.7 120 VAC and >0.5 230 VAC. shutdown circuitry into a monolithic IC. 5. PF low: for non-PF application where C >5 mF minimum. IN 6. Packages: P: PDIP-8B, D: SO-8C. The start-up and operating power are derived directly from the voltage on the DRAIN pin. This eliminates the need for a bias supply and associated circuitry plus allowing low-cost discrete inductors to be used. The fully integrated auto-restart circuit in the LYTSwitch-0 family safely limits output power during fault conditions such as short-circuit or open-loop, reducing component SO-8C (D Package) count and lower system cost. Package options for thru-hole and PDIP-8B (P Package) surface-mount suit different manufacturing requirements. Figure 2. Package Options. www.power.com June 2015 This Product is Covered by Patents and/or Pending Patent Applications.LYT0002/0004-0006 Topology Basic Circuit Schematic Key Features FB BP D S + High-Side Output referenced to input LYTSwitch-0 Buck Positive output (V ) with respect to -V O IN Direct Step down V < V O IN V IN Feedback Low cost direct feedback (5% typ.) PI-7043-053113 Output referenced to input PI-7044-060313 Low-Side Negative output (V ) with respect to +V O IN + Buck Step down V < V O IN I O Constant Optocoupler feedback Current LED Low-cost non-safety rated optocoupler V IN V + F Driver Optional Zener provides disconnected load Optocoupler protection BP FB Feedback Accuracy determined by V variation of F D S optocoupler LED V F R = LYTSwitch-0 I O Output referenced to input Negative output (V ) with respect to +V O IN High-Side Step up/down V > V or V < V R FB BP SENSE O IN O IN I O Buck-Boost Low-cost direct feedback (5% typ.) D S Constant Fail-safe output is not subjected to input voltage LYTSwitch-0 Current LED if the internal power MOSFET fails V IN Driver Ideal for driving LEDs better accuracy and temperature stability than low-side Buck constant current LED driver PI-7045-060313 + Output referenced to input Low-Side Positive output (V ) with respect to -V O IN Boost D Step up V > V V FB O IN IN Constant Low-cost direct feedback (5% typ.) LYTSwitch-0 BP Current LED Ideal for driving high-voltage LEDs string good S Driver accuracy and temperature stability PI-7046-053113 Output referenced to input + Positive output (V ) with respect to -V O IN Low-Side Step down V < V O IN Flyback Low-cost direct feedback (5% typ.) D V FB Constant Fail-safe output is not subjected to input voltage IN LYTSwitch-0 BP Current LED if the internal power MOSFET fails Driver S Ideal for driving very low voltage LEDs string good accuracy and temperatur e stability PI-7047-060313 Table 2. Common Circuit Configurations Using LYTSwitch-0 for Driving LEDs. 2 Rev. B 06/15 www.power.com