Datasheet > UC3823

UC3823

更新时间： 2024-11-19 14:54:27

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
10页	918K
描述
low cost power-saving mode pwm controller for...

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UC3823 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UC3823

Advance

CMOS IC

LOW COST POWER-SAVING

MODE PWM CONTROLLER FOR

FLYBACK CONVERTERS



DESCRIPTION

The UTC UC3823 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 UC3823 is a high performance current mode PWM

controller ideally suited for low standby power. Low V_CCstartup

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 UC3823 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 UC3823 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/V_CCOVP/OTP/BNO/LNO (automatic recovery)

* Internal Soft Start

www.unisonic.com.tw

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