Datasheet > UC3853A

UC3853A

更新时间： 2024-11-05 14:53:19

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
14页	658K
描述
current mode pwm controller for forward and f...

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UC3853A 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UC3853A

Advance

LINEAR INTEGRATED CIRCUIT

CURRENT MODE PWM

CONTROLLER FOR FORWARD

AND FLYBACK APPLICATIONS



DESCRIPTION

The UTC UC3853A is a high performance current mode PWM

controller ideally suited for low standby power. Low V_DDstartup

current make the power reliable on startup design and a large

value resistor could be used 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. It contains protection with

automatic recovery including OLP, OCP, V_CCOVP, BNO and OTP.

To protect the power MOSFET, Gate-drive output is fixed up to 15V

max.

SOP-8

Excellent EMI performance is achieved with UTC proprietary

frequency hopping technique (ZL201020615247.1) together with

soft driver control. The controller offers everything needed to build

cost−effective and reliable ac−dc switching supplies dedicated to

ATX power supplies. Finally a SOP-8 package saves PCB space

and represents a solution of choice in cost sensitive project.



FEATURES

* Peak Current Mode Control

* Adjustable Switching Frequency

* Delayed Operation Upon Start−up via an Internal Fixed

Timer

* Adjustable Soft−start Timer

* UC384X−like UVLO Thresholds

* Adjustable Internal Ramp Compensation

* Jittering Frequency ±6% of the Switching Frequency

* Power-saving mode for high standby efficiency

* Auto−recovery Primary OCP with 10ms Fixed Delay

* Auto−recovery Brown−Out Detection

* V_CCfrom 9V to 28V with Auto−recovery UVLO

* Internal 350ns Leading Edge Blanking

* Gate output voltage clamped at 15V

* UC3853A: Maximum 47% Duty Cycle



ORDERING INFORMATION

Ordering Number

Package

SOP-8

Packing

Lead Free

Halogen Free

UC3853AL-S08-R

UC3853AG-S08-R

Tape Reel

UC3853AG-S08-R

(1) R: Tape Reel

(2) S08: SOP-8

(1)Packing Type

(2)Package Type

(3)Green Package

(4)Duty Cycle

(3) G: Halogen Free and Lead Free, L: Lead Free

(4) A: 47%

www.unisonic.com.tw

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