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UC3801 PDF预览

UC3801

更新时间: 2024-11-21 14:54:47
品牌 Logo 应用领域
友顺 - UTC /
页数 文件大小 规格书
10页 295K
描述
low cost power-saving mode pwm controller for...

UC3801 数据手册

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UNISONIC TECHNOLOGIES CO., LTD  
UC3801  
Preliminary  
CMOS IC  
LOW COST POWER-SAVING  
MODE PWM CONTROLLER  
FOR FLYBACK CONVERTERS  
4
5
6
DESCRIPTION  
3
2
The UTC UC3801 provides a CCM/valley switching mixed  
1
mode operation for better efficiency performance. The operation  
mode stays at CCM at heavy load, and switch to valley switching at  
light load.  
SOT-26  
The UTC UC3801 is a high performance current mode PWM  
controller ideally suited for low standby power. Low VCC startup  
current make the power reliable on startup design and a large  
value resistor could be used in the startup circuit to minimize the  
standby power. 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 UTC UC3801 contains protection with automatic recovery  
including OLP (over load protection), OCP (cycle-by-cycle current  
limiting), and UVLO (VCC over voltage clamp and under voltage  
lockout). It also provides the protections including OTP (over  
temperature protection), BNO(AC Brown Out protection) , LNO(AC  
Over voltage protection), OVP (VCC or DC output over voltage  
protection) with automatic recovery. To protect the power  
MOSFET, Gate-drive output is fixed up to 16V max.  
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 minima  
external component count in the design. 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.  
UTC UC3801 is packaged by using tiny SOT-26 package. It has  
such applications as: battery charger, power adaptor, set-top box  
power supplies, ink jet printers, open-frame SMPS.  
FEATURES  
* Proprietary frequency hopping for Improved EMI performance  
* Cycle-by-cycle current limiting  
* CCM/Valley Switching Operation  
* Fixed switch frequency 60~70kHz  
* Dynamic peak current limiting for constant output power  
* Built-in synchronized slope compensation  
* Gate output voltage clamped at 16V  
* Adjustable DC output OVP/UVP/OTP  
* OLP/VCC OVP/OTP/BNO/LNO (automatic recovery)  
* Internal Soft Start  
www.unisonic.com.tw  
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Copyright © 2022 Unisonic Technologies Co., Ltd  
QW-R103-172.b  

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