Datasheet > UC3838

UC3838

更新时间： 2024-09-11 14:55:15

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
12页	1112K
描述
low cost power-saving mode pwm controller for...

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

UC3838 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UC3838

Preliminary

CMOS IC

LOW COST POWER-SAVING

MODE PWM CONTROLLER

FOR FLYBACK CONVERTERS



DESCRIPTION

The UTC UC3838 provides a CCM switching mixed mode

operation for better efficiency performance. The operation mode

stays at CCM at heavy load, and switch to power-saving mode at

light load.

The UTC UC3838 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 UC3838 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), OVP (V_CCor DC output over voltage

protection) with automatic recovery. To protect the power

MOSFET, Gate-drive output is fixed up to 17V 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 together with soft driver control. Audio noise is

eliminated due to switch frequency more than 20kHz during

operation.

UTC UC3838 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 Power-saving mode Switching Operation

* Fixed switch frequency 65kHz TYP.

* Dynamic peak current limiting for constant output power

* Built-in synchronized slope compensation

* Gate output voltage clamped at 17V

* Adjustable DC output OVP/OTP

* OLP/V_CCOVP/Internal OTP (automatic recovery)

* Internal Soft Start

* OTP through a NTC (latch mode)

www.unisonic.com.tw

1 of 12

QW-R103-192.a

12 3 4 5 6 7...12

中文翻译

下载PDF

与UC3838相关器件

型号	品牌	获取价格	描述	数据表
UC3838A	TI	获取价格	Magnetic Amplifier Controller
UC3838ADP	TI	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, POWER, SOIC-16
UC3838ADPTR	TI	获取价格	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, POWER, SOIC-16, Power Management Circuit
UC3838ADWTRG4	TI	获取价格	IC,MAGNETIC AMPLIFIER CONTROLLER,BIPOLAR,SOP,16PIN
UC3838AN	TI	获取价格	SPECIALTY ANALOG CIRCUIT, PDIP16
UC3838ANG4	TI	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP16, PLASTIC, DIP-16
UC3838AQ	ETC	获取价格	MAGNETIC AMPLIFIER CONTROLLER
UC3838DW	TI	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO16, SOIC-16
UC3838DWTR	TI	获取价格	IC,MAGNETIC AMPLIFIER CONTROLLER,BIPOLAR,SOP,16PIN
UC3838N	TI	获取价格	SPECIALTY ANALOG CIRCUIT, PDIP16, PLASTIC, DIP-16