Datasheet > UC3873C

UC3873C

更新时间： 2024-09-18 14:55:23

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
10页	402K
描述
low cost power-saving mode pwm controller for...

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UC3873C 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UC3873C

Preliminary

LINEAR INTEGRATED CIRCUIT

LOW COST POWER-SAVING

MODE PWM CONTROLLER

FOR FLYBACK CONVERTERS

DESCRIPTION

The UTC UC3873C 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 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 UC3873C contains protection with automatic recovery

including OLP (over load protection), OCP (cycle-by-cycle current

limiting), and UVLO (V_DDover voltage clamp and under voltage

lockout). It also provides the protections including OTP (over

temperature protection), OVP (over voltage protection) in UTC

UC3873C 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 minimal 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.

The UTC UC3873C has such applications 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 * V_DDclamp for higher security

performance.

* Programming OTP for higher security

* Fixed switch frequency 65kHz

* Gate output voltage clamped at 16V

* Low start-up current

* Cycle-by-cycle current limiting

* Under voltage lockout (UVLO)

* Few external components required

* Power-saving mode for high light-load and standby efficiency

* Soft Start

* Dynamic peak current limiting for constant output power

* Built-in synchronized slope compensation

* OLP with automatic recovery

* OTP and OVP( automatic recovery)

www.unisonic.com.tw

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与UC3873C相关器件

型号	品牌	获取价格	描述	数据表
UC3873G-AG6-R	UTC	获取价格	LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS
UC3873H	UTC	获取价格	low cost power-saving mode pwm controller for...
UC3873L-AG6-R	UTC	获取价格	LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS
UC3874	TI	获取价格	High Efficiency, Synchronous, Step-down (Buck) Controllers
UC3874-1	TI	获取价格	High Efficiency, Synchronous, Step-down (Buck) Controllers
UC3874-2	TI	获取价格	High Efficiency, Synchronous, Step-down (Buck) Controllers
UC3874DW-1	TI	获取价格	High Efficiency, Synchronous, Step-down Buck Controllers
UC3874DW-1	ROCHESTER	获取价格	1A SWITCHING CONTROLLER, 300kHz SWITCHING FREQ-MAX, PDSO18, GREEN, SOIC-18
UC3874DW-1G4	TI	获取价格	High Efficiency, Synchronous, Step-down (Buck) Controllers
UC3874DW-2	TI	获取价格	High Efficiency, Synchronous, Step-down Buck Controllers

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