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LYT4214 Datasheet(PDF) 2 Page - Power Integrations, Inc. |
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LYT4214 Datasheet(HTML) 2 Page - Power Integrations, Inc. |
2 / 20 page Rev. B 02/13 2 LYT4211-4218/4311-4318 www.powerint.com Figure 3d. Typical Buck-Boost Schematic. Figure 3c. Typical Tapped Buck Schematic. Figure 3b. Typical Buck Schematic. Figure 3a. Typical Isolated Flyback Schematic. Table 2. Performance of Different Topologies in a Typical Non-Dimmable 10 W Low-Line Design. CONTROL Topology Isolation Efficiency Cost THD Output Voltage Isolated Flyback Yes 88% High Best Any Buck No 92% Low Good Limited Tapped Buck No 89% Middle Best Any Buck-Boost No 90% Low Best High-Voltage PI-6841-081512 D S BP V FB R CONTROL AC IN LYTSwitch PI-6842-081512 D S BP CONTROL AC IN V FB R LYTSwitch Typical Circuit Schematic Key Features Flyback Benefits • Provides isolated output • Supports widest range of output voltages • Very good THD performance Limitations • Flyback transformer • Overall efficiency reduced by parasitic capacitance and inductance in the transformer • Larger PCB area to meet isolation requirements • Requires additional components (primary clamp and bias) • Higher RMS switch and winding currents increases losses and lowers efficiency Buck Benefits • Highest efficiency • Lowest component count – small size • Simple low-cost power inductor • Low drain source voltage stress • Best EMI/lowest component count for filter Limitations • Single input line voltage range • Output voltage <0.6 × V IN(AC) × 1.41 • Output voltage for low THD designs • Non-isolated Tapped Buck Benefits • Ideal for low output voltage designs (<20 V) • High efficiency • Low component count • Simple low-cost tapped inductor Limitations • Designs best suited for single input line voltage • Requires additional components (primary clamp) • Non-isolated Buck-Boost Benefits • Ideal for non-isolated high output voltage designs • High efficiency • Low component count • Simple common low-cost power inductor can be used • Lowest THD Limitations • Maximum V OUT is limited by MOSFET breakdown voltage • Single input line voltage range • Non-isolated PI-6859-081512 D S BP V FB R CONTROL AC IN LYTSwitch |
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