Description
The IRS2505L is a control IC for PFC boost converters operating in critical-conduction mode. The IC incorporates a voltage feedback loop for output voltage regulation combined with smart zero crossing detection to control the gate drive output without the need for a secondary inductor winding. DC output over-voltage protection and cycle-by-cycle over-current protection are also included. Multi-functional inputs enable the IRS2505L to perform all functions with only 5 pins.

FEATUREs
● Critical-conduction mode PFC control (CrCM)
● High PF and ultra-low THD
● Wide line and load range
● Regulated DC output voltage
● No secondary winding required
● Cycle-by-cycle over-current protection
● Output over-voltage protection
● 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