The LYTSwitch-2 family of primary-side AC-DC converters from Power Integrations is designed for LED driver applications in sold state lighting. These devices dramatically simplify low power constant-current LED driver solutions by eliminating the opto-coupler and secondary control circuitry. They incorporate a high-voltage switching MOSFET plus control circuitry in a compact monolithic IC which requires very few external components. Typical applications include LED lamps and down-lights, luminaires, ballasts and T8 tubes.
• Accurate constant-current regulation, typically ±3% • Automatic compensation for transformer inductance variation, external component changes with temperature and input line voltage variations • Elimination of opto-coupler and secondary control circuitry • Elimination of control loop compensation circuitry • Frequency-jitter greatly reduces EMI filter cost • Programmable switching frequency reduces required transformer size • Auto-restart protection reduces power delivered by >90% for fault conditions • Hysteretic thermal shutdown with automatic recovery • Meets high-voltage creepage requirements between MOSFET drain and all other pins • Energy efficient - No-load consumption <30 mW
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