Datasheet > UC3883

UC3883

更新时间： 2024-11-26 14:54:43

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
7页	291K
描述
high performance current mode pwm controller ...

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UC3883 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UC3883

Preliminary

CMOS IC

HIGH PERFORMANCE

CURRENT MODE PWM

CONTROLLER WITH PEAK

LOAD



DESCRIPTION

UTC UC3883 is a highly integrated current mode PWM control

SOT-26

IC optimized for high performance, low standby power and cost

effective offline flyback converter applications.

PWM switching frequency at normal operation is internally fixed

and is trimmed to tight range. At no load or light load condition, the

IC operates in extended ‘burst mode’ to minimize switching loss.

Lower standby power and higher conversion efficiency is thus

achieved.

V_CClow startup current and low operating current contribute to a

reliable power on startup and low standby design with UTC

UC3883.

UTC UC3883 offers complete protection coverage with

auto-recovery including Cycle-by-Cycle current limiting (OCP), over

load protection (OLP), over temperature protection (OTP) and V_CC

under voltage lockout (UVLO). It also provides the over voltage

protection (OVP) protections with latched shut down. Excellent EMI

performance is achieved with UTC proprietary frequency shuffling

technique.

The tone energy at below 20KHZ is minimized in the design and

audio noise is eliminated during operation.



FEATURES

* Power on Soft Start Reducing MOSFET V_DSStress

* Frequency shuffling for EMI

* Extended Burst Mode Control For Improved Efficiency and

Minimum Standby Power Design

* Ultra Low Operating Current at Light Load (typical 0.6mA)

* Audio Noise Free Operation

* Normal 65KHz Switching Frequency

* Frequency Triple for peak load (180KHz)

* Adjustable Overload Protection (OLP) delay time

* Comprehensive Protection Coverage

V_CCUnder Voltage Lockout with Hysteresis (UVLO)

Cycle-by-cycle over current threshold setting for constant output

power limiting over universal input voltage range

Overload Protection (OLP) with autorecovery

External (if NTC resistor is connected at CT/RT pin) or internal (if

capacitor is connected at CT/RT pin) Over Temperature

Protection (OTP) with autorecovery.

V_CCOver Voltage Protection (OVP) with latch shut down

www.unisonic.com.tw

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