AP8024 datasheet(8/11 Pages) AITSEMI

8 / 11 page

AiT Semiconductor Inc.

www.ait-ic.com

AP8024

AC-DC PFM CONTROLLER

NON-ISOLATED PFM CONVERTERS

REV2.0

- JAN 2015 RELEASED, MAR 2018 UPDATED -

- 8 -

current sampling and the maximum current limit (Ilimit), inductance is the only parameter of the frequency

modulation when output voltage and output current are fixed.

Soft-Start up

In order to regulate peak current in deep CCM mode, AP8024 build in soft-start function, at the first 10ms of

start up, the switching frequency decrease to 25% of the maximum frequency, while 10ms to 15ms of start up,

the switching frequency decrease to 50% of the maximum frequency. Meanwhile, the leading edge blanking

(LEB) is 300ns (Typ.), in order to regulate peak current.

Smart Protection Control

AP8024 has several smart self-protection functions, such as Over Temperature Protection(OTP),VDD

Under-Voltage Lockout(UVLO).And all these protections have self-recovery mode.

OTP----If the inner junction temperature exceeds 150℃,the IC will shut down switching, until the junction

temperature falls to 120℃.

UVLO----If VDD pin Voltage drops below VDDoff, the IC will restart. Otherwise, self-restart time can be changed

by VDD capacitor. The larger the capacitor, the longer the self-restart time is.

AP8024 데이터시트(PDF) 8 Page - AiT Semiconductor Inc.