GENERAL DESCRIPTION

LY9523/LY9525/LY9526/LY9527/LY9528

combines a dedicated current mode PWM

controller with integr ated hig h voltag e po wer

MOSFET.

Vcc low startup current and low operating

current contribute to a reliable power on startup

design with LY9523/LY9525/LY9526/LY9527/LY9528. the IC operates in Extended

‘burst mod e’ to minimize switching loss. Low er standb y po we r and hi gh er

conve rsion efficiency is thus achieved.

DIP8-300-2.54

LY9523/L Y9525/LY9526/LY9527/LY9528 operates in the fixed PWM frequency ,the

frequ ency is 65KHz.

Excellent EMI perfor mance is achieved with proprietary frequency huffling echnique.

Soft Start with 4mS,LY9523/LY9525/LY9526/LY9527/LY9528 offers complete

protection coverage with automatic self-recovery feature including Vcc over voltage

clamp and under voltage lockout (UVLO), over voltage protection(OLP),over current

protection (OCP).L Y9523/L Y9525/LY952 6/ LY952 7/L Y952 8 is offered i n DIP-8

package.

FEATURES

z Integrate d high voltage power MOSFET

z Low Vcc Startup Current(5μA)

z “No Y-CAP”system design in sub 20W range

z Frequency shuffling for EMI

z Over current Protection(OCP),over voltage Protection(OVP)

z UVLO and Auto Self- Recovery

z Soft Start with 4mS

z Burst Mode

z Cycle-by-Cycle Over-current limiting

z OTP

APPLICATIONS

z DVD/DVB/Set-Top Box Power Supplies

z Offline AC/DC Flyback converter

z Battery Charger

z Open-frame SMPS