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UC3869H

更新时间： 2023-12-06 20:00:59
品牌 Logo 应用领域
友顺 - UTC /
页数 文件大小 规格书
9页 316K
描述
high voltage green mode pwm controller

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UC3869H 数据手册

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UNISONIC TECHNOLOGIES CO., LTD  
UC3869H  
Preliminary  
LINEAR INTEGRATED CIRCUIT  
HIGH VOLTAGE GREEN MODE  
PWM CONTROLLER  
DESCRIPTION  
The UTC UC3869H is a highly integrated current mode PWM  
control IC with high voltage start up, optimized for high  
performance, low standby power consumption and cost effective  
offline flyback converter applications.  
PWM switching frequency at normal operation is internally fixed  
and is trimmed to a tight range. At no load condition, the IC  
operates in power-saving mode for lower standby power,  
decreasing frequency for Higher conversion efficiency at light load  
condition. The internal slope compensation improves system  
stability at high PWM duty cycle output. Leading-edge blanking on  
current sense input removes the signal glitch, which offering  
minimal external component count in the design.  
The UTC UC3869H offers complete protection coverage  
including Cycle-by-Cycle current limiting (OCP), VDD under voltage  
lockout (UVLO), over load protection (OLP), over temperature  
protection (OTP), and over voltage protection (OVP). Excellent EMI  
performance is achieved with UTC proprietary frequency hopping  
technique (ZL201020615247.1) together with soft driver control.  
Audio noise is eliminated due to switch frequency more than 20kHz  
during operation. The tone energy at below 22KHZ is minimized to  
avoid audio noise during operation.  
FEATURES  
* High voltage startup  
* Power on soft start reducing MOSFET Vds stress  
* Efficiency and minimum standby power  
* Frequency shuffling for EMI  
* Audio noise free operation  
* Fixed 100KHZ switching frequency  
* Comprehensive protection coverage  
VDD Under Voltage Lockout with Hysteresis (UVLO)  
Cycle-by-cycle over current protection (OCP)  
Overload Protection (OLP)  
External programmable Over Temperature Protection (OTP)  
VDD Over voltage Protection(OVP)  
www.unisonic.com.tw  
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Copyright © 2019 Unisonic Technologies Co., Ltd  
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