Datasheet > UC3973

UC3973

更新时间： 2024-11-22 14:54:51

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
10页	348K
描述
low cost power-saving mode pwm controller for...

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UC3973 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UC3973

LINEAR INTEGRATED CIRCUIT

LOW COST POWER-SAVING

MODE PWM CONTROLLER

FOR FLYBACK CONVERTERS



DESCRIPTION

The UC3973 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.

SOP-8

The UC3973 contains protection with automatic recovery

including OLP (over load protection), programming OTP (over

temperature protection), OVP (over voltage protection), UVLO (V_DDover voltage clamp and under voltage

lockout).To protect the power MOSFET, Gate-drive output is fixed up to 16V max. The UC3973 contains protection

OCP (cycle-by-cycle current limiting).

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 UC3973 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 * Programming OTP for higher security

performance.

* Fixed switch frequency 65kHz

* Gate output voltage clamped at 15V

* Low start-up current

* 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,OVP and V_DDclamp for higher security

* Cycle-by-cycle Current Limiting

* Under voltage lockout (UVLO)

* Few external components required



ORDERING INFORMATION

Ordering Number

UC3973G-S08-R

Package

SOT-8

Packing

Tape Reel

www.unisonic.com.tw

1 of 10

QW-R103-086.B

12 3 4 5 6 7...10

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