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Power Integrations LYTSwitch-2 Primary-Side Regulation Switcher ICs

Power Integrations LYTSwitch-2 Primary-Side Regulation CC/CV Switcher ICs dramatically simplify low power CC LED drivers by eliminating the optocoupler and secondary control circuitry. They introduce a revolutionary control technique to provide accurate output current regulation, compensating for transformer and external component variations, and device parameter tolerances as well as input voltage variations. Power Integrations LYTSwitch-2 incorporates a high-voltage switching MOSFET, a novel ON/OFF control state machine, a high-voltage switched current source for self-biasing, frequency jitter to reduce EMI, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry into a monolithic IC. 

Features

  • Controller automatically compensates for
    • Transformer inductance variation
    • External component changes with temperature
    • Input line voltage variations
  • Small-size designs
    • Eliminates the optocoupler and secondary CC control circuitry
    • Eliminates control loop compensation circuitry
    • Frequency jittering greatly reduces EMI filter cost
    • Programmable switching frequency reduces transformer size
    • 725V switching power MOSFET enables clampless flyback designs
  • Advanced protection/safety features
    • Auto-restart protection reduces power delivered by >90% for output short-circuit and control loop faults (open and short-circuit components)
    • Hysteretic thermal shutdown - with automatic recovery
    • Reduced field returns
    • Meets high-voltage creepage requirements between DRAIN and all other pins both on the PCB and at the package
  • EcoSmart™ - energy efficient
    • No-load consumption <30mW
    • No current sense resistors - maximizes efficiency

Applications

  • LED bulbs
  • Down lights
  • Luminaires
  • Ballasts
  • T8 tubes

Videos

Functional Block Diagram

Block Diagram - Power Integrations LYTSwitch-2 Primary-Side Regulation Switcher ICs

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Inilathala: 2014-06-11 | Na-update: 2022-03-11