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UC3816A

UTC
Part Number UC3816A
Manufacturer UTC
Description LOW COST POWER-SAVING MODE PWM CONTROLLER
Published Apr 22, 2020
Detailed Description UNISONIC TECHNOLOGIES CO., LTD UC3816A CMOS IC LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS  DES...
Datasheet PDF File UC3816A PDF File

UC3816A
UC3816A

Overview
UNISONIC TECHNOLOGIES CO.
, LTD UC3816A CMOS IC LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS  DESCRIPTION The UTC UC3816A provides a CCM/valley switching mixed mode operation for better efficiency performance.
The operation mode stays at CCM at heavy load, and switch to valley switching at light load.
The UTC UC3816A 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 UC3816A 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 UC3816A 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.
54 6 23 1 SOT-26  FEATURES * Proprietary frequency hopping for Improved EMI performance * Cycle-by-cycle current limiting * CCM/Valley...


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