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Description

The IRS2505 is a control IC for boost-type PFC circuits operating in critical-conduction mode. The IC incorporates a free-running frequency oscillator with on- and off-time control of the boost power MOSFET without the need for a secondary winding. Also included in the design is over-voltage protection of the DC bus and cycle-by-cycle over-current protection of the power MOSFET. Micro-power start-up current and an internal 20.8V zener clamp at VCC are provided to simplify the external VCC supply circuitry. ESD and latch immune CMOS technology enables a rugged monolithic IC construction.

Features

? Critical-conduction mode PFC control

? High PF and ultra-low THD

? Wide load and line range

? Regulated and programmable DC bus voltage

? No secondary winding required

? MOSFET cycle-by-cycle over-current protection

? DC bus over-voltage protection

? Low EMI gate drive

? Ultra-low start-up current

? 20.8V internal zener clamp on VCC

? Excellent ESD and latch immunity

? RoHS compliant

? 5-pin SOT-23 package

Applications

? Off-line power supply

? Electronic ballast

? LED power supply