Datasheet > UC3846

UC3846

更新时间： 2024-09-30 07:09:15

品牌	Logo	应用领域
友顺 - UTC		转换器控制器
页数	文件大小	规格书
10页	319K
描述
LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS

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UC3846 数据手册

UNISONIC TECHNOLOGIES CO., LTD

UC3846

LINEAR INTEGRATED CIRCUIT

LOW COST POWER-SAVING

MODE PWM CONTROLLER

FOR FLYBACK CONVERTERS

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.

DIP-8

Low V_DDstartup 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 (V_DDover

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 on current

sense (CS) input removes the signal glitch that offers minimal

reqnirement of external component and lower system cost.

Excellent EMI performance is achieved by UTC proprietary

frequency hopping technique together with soft driver control.

Audio noise is eliminated because switch frequency is more

than 20kHz during operation.

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 V_DDclamp for higher security

* Programmable PWM Frequency

* Gate output voltage clamped at 15V

* Low start-up current

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

* Cycle-by-cycle Current Limiting

* Under voltage lockout (UVLO)

* Few external components required

ORDERING INFORMATION

Ordering Number

Lead Free

Package

DIP-8

Packing

Tube

Halogen Free

UC3846G-D08-T

UC3846L-D08-T

(1) T: Tube

(1)Packing Type

(2)Package Type

(3)Lead Free

(2) D08: DIP-8

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

www.unisonic.com.tw

1 of 10

QW-R103-053.B

12 3 4 5 6 7...10

中文翻译

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与UC3846相关器件

型号	品牌	获取价格	描述	数据表
UC3846_15	UTC	获取价格	CURRENT MODE PWM CONTROLLER
UC3846DW	ROCHESTER	获取价格	0.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16, GREEN, SOIC-16
UC3846DW	TI	获取价格	Current Mode PWM Controller
UC3846DWG4	TI	获取价格	Current Mode PWM Controller
UC3846DWTR	TI	获取价格	Current Mode PWM Controller
UC3846DWTRG4	TI	获取价格	Current Mode PWM Controller
UC3846FN	ETC	获取价格	Current-Mode SMPS Controller
UC3846G-D08-T	UTC	获取价格	LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS
UC3846G-D16-T	UTC	获取价格	CURRENT MODE PWM CONTROLLER
UC3846G-S16-R	UTC	获取价格	CURRENT MODE PWM CONTROLLER

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