UC3846 UTC一线代理 UC3846 现货特价热销

DESCRIPTION
The UTC UC3846 is a high performance current mode PWM
controller ideally suited for low standby power and cost effective
off-line flyback converter.  
Low VDDstartup current make the power reliable in 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 burst mode for lower standby power and in
decreasing frequency for higher conversion efficiency at light
load condition. The PWM switching frequency is programmable
externally at normal operation.
The UTC  UC3846 contains protection coverage with
automatic self-recovery including OCP (cycle-by-cycle current
limiting), OTP (over temperature protection), UVLO (VDDover
voltage clamp and under voltage lockout).To protect the power
MOSFET, Gate-drive output is fixed up to 15V max.
The internal slope compensation improves system stability at
high PWM duty cycle output. Leading-edge blanking oncurrent
sense (CS) input removes the signal glitch that offers minimal
reqnirement of external component and lower system cost.
Excellent EMI performance is achieved byUTC proprietary
frequency hopping technique together with soft driver control.
Audio noise is eliminated because switch frequency ismore
than 20kHz during operation.
The UTC UC3846 can be used in the applications, such as
battery charger, power adaptor, set-top box power supplies, ink
jet printers open-frame SMPS

  FEATURES
* UTC proprietary frequency hopping technology
for Improved EMI 
* performance.
* Power-saving mode for high light-load efficiency
* Burst mode for minimum standby power
* Dynamic peak current limiting for constant output
power
* Built-in synchronized slope compensation
* OTP,OVP and VDD
 clamp for higher security
* Programmable PWM Frequency
* Gate output voltage clamped at 15V
* Low start-up current
* Cycle-by-cycle Current Limiting
* Under voltage lockout (UVLO)
* Few external components required

 

粤嘉鸿电子是一家从事的电子元器件销售的一般纳税人企业，有多年的MOS管、电源IC、三极管的供应经验和渠道，是UTC（台湾友顺）的一线授权代理商。我们经营的产品广泛应用于开关电源、LED灯电源、适配器、车载逆变电源、液晶电视电源、DVD和DVB电源板、通信逆变电源、电动工具电源、应急灯电源、手机充电器等诸多领域。 公司理念：“诚信经营，创造价值，高效服务”。 经营方针：只卖优质产品、常备现货、贴近客户、服务。 选择我们的理由：1、产品优质渠道有保证；2、常备现货交货期短；3、有ERP 信息系统管理更规范；4、有香港公司和货仓合作方式灵活；5、团队稳定。 产品分类：　 Amplifier / Comparator： Audio Amplifiers、 Operational Amplifier Voltage Comparator Power Management： Combo IC、DDR Termination Regulators FET Bias Controllers Inverting DC-DC Converter Li-Battery Protection or Charger IC Linear Regulators、PWM Controller Low Dropout Linear Regulators Power Factor Control、White LED Driver Shunt Reference Regulators Step Down Switching Regulators Step-Up DC-DC Converter and Controller Supervisory Circuit、USB Power Switch Voltage Detection and System Reset ICHall ICs Darlington Transistors Dual Chip Transistors： Complex Bipolar Transistors Complex Digital Transistors Analog Switches： Analog Multiplexers, Demultiplexer ICs Video Signal Switch Special Application ICs： A-D or D-A Converters Alarm /Sound Generator IC Automotive IC、Motor Controller IC Christmas Lamp Controller Interface and Driver Circuit Leakage Current Detector Melody IC、Miscellaneous Radio and Cassette Recorder Circuit Remote Controller IC Telecommunication Circuit Television Circuit、Timer Logic MOSFETs： JFET Power Mosfet TRIACs and SCRs Built-In Bias Resistor Transistors