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General Description
The SY58203 is a single stage Flyback and PFC
regulator targeting at LED lighting applications. It
integrates a 700V MOSFET to decrease physical
volume. It is a primary side controller without applying
any secondary feedback circuit for low cost, and drives
the Flyback converter in the quasi-resonant mode to
achieve higher efficiency. It keeps the Flyback
converter in constant on time operation to achieve high
power factor
Features
· Integrated 700V MOSFET
· Primary side control eliminate to the opto-coupler.
· Valley turn-on of the primary MOSFET to achieve
low switching losses
· 0.3V primary current sense reference voltage leads
to a lower sense resistance thus a lower conduction
loss.
· Low start up current: 15μA typical
· Reliable short LED and Open LED protection
· Power factor >0.90 with single-stage conversion.
· Maximum frequency limit: 120kHz
· Compact package: SO8
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