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UC3816A UC3816B

更新时间： 2024-11-19 14:53:11

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
9页	331K
描述
low cost power-saving mode pwm controller for...

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UC3816A UC3816B 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UC3816A/B

CMOS IC

LOW COST POWER-SAVING

MODE PWM CONTROLLER

FOR FLYBACK CONVERTERS



DESCRIPTION

The UTC UC3816A/B 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.

SOT-26

The UTC UC3816A/B is a high performance current mode

PWM controller ideally suited for low standby power. Low V_CC

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/B contains protection with automatic

recovery including OLP (over load protection), OCP (cycle-by-cycle

current limiting), and UVLO (V_CCover 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 (V_CCor 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/B 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

* OLP/V_CCOVP/OTP/BNO/LNO (automatic recovery)

* Internal Soft Start

www.unisonic.com.tw

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