Datasheet > SG3842G2ASZ

SG3842G2ASZ

更新时间： 2024-02-12 13:34:45

品牌	Logo	应用领域
其他 - ETC		控制器
页数	文件大小	规格书
19页	351K
描述
BiCMOS Green-Mode PWM Controllers

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中文翻译

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技术参数
数据手册

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SG3842G2ASZ 技术参数

生命周期：	Transferred	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.77
Base Number Matches：	1

SG3842G2ASZ 数据手册

Product Specification

BiCMOS Green-Mode PWM Controllers

SG3842G/ SG3843G

start-up current has been reduced to 5uA, and the

minimum operating current has been reduced to 5mA.

Each SG384xG has a slew rate controlled high current

totem pole output, ideally suited for driving a power

MOSFET while keeping EMI low.

FEATURES

ꢀ

384x series pin-to-pin compatible

Linearly decreasing PWM frequency

Burst-mode at low/zero load

5uA start-up current

5mA operating current

The current-sense propagation delay is typically

50ns, resulting in significantly more effective constant

power protection. During normal operation, a SG384xG

controller acts as a fixed frequency PWM controller. The

PWM frequency can be easily programmed by changing

external R_Tand C_Tvalues. The SG384xG includes two

Green-mode functions that dramatically reduce power

usage, helping the power supply comply with the latest

international power saving guidelines. To cut power

consumption under light load conditions, the controller’s

Green-mode function will linearly decrease the PWM

frequency in response to decreases in the output load.

Under ultra light-load/zero-load conditions, the RT/CT

PWM oscillator periodically shuts down, and enters into

Burst-mode. This causes the IC’s supply voltage to begin

gradually dropping. Just before the supply voltage drops

below the UVLO voltage threshold, the RT/CT PWM

oscillator turns back on, to prevent the supply voltage

from going below the UVLO voltage.

Vcc over voltage protection

Cycle-by-cycle current limiting

Zero cross-conduction

Slew rate controlled high current totem pole output

Fast current sense propagation delay

Under voltage lockout (UVLO) with hysteresis

APPLICATIONS

ꢀ

Switching mode power supplies

Power converters

DESCRIPTION

The SG348xG series of current-mode PWM

controllers combines high performance with Green-mode

power saving features. SG348xG controllers are fully

pin-to-pin compatible with bipolar UC384x devices, but

they have improved features and functionality. SG384xG

series controllers are compatible with the BiCMOS

fabrication process, enabling the use of low start-up

current and operating currents. This feature further

improves power conversion efficiency. The minimal

SG384xG controllers also come with Over Voltage

Protection (OVP). This shuts down PWM output if the

supply voltage ever exceeds 27V. The SG384xG series

comes in 8-pin DIP and SOP packages.

TYPICAL APPLICATION

Green-mode Operation

Oscillator Frequency vs. COMP

From bridge rectifier

120~ 380VDC

From auxiliary winding

Oscillator Frequency (Fosc) vs COMP Voltage

C_IN

R_IN

10u

1.5M

VCC

R41

100

COMP

VREF

Rac

10k

OUTPUT

C21

0.1u

R42

R_T

SG384x

10k

SENSE

RT/CT

R_S

C25

C_T

3.3n

0.3

100p

VFB

1.5

2.5

GND

COMP VOLTAGE (V)

Version 1.4 ( IRO33.0007.B3)

- 1 -

www.sg.com.tw

Jun.28,2004

12 3 4 5 6 7...19

中文翻译

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与SG3842G2ASZ相关器件

型号	品牌	获取价格	描述	数据表
SG3842GAD	ETC	获取价格	BiCMOS Green-Mode PWM Controllers
SG3842GADZ	ETC	获取价格	BiCMOS Green-Mode PWM Controllers
SG3842GAS	ETC	获取价格	BiCMOS Green-Mode PWM Controllers
SG3842GASZ	ETC	获取价格	BiCMOS Green-Mode PWM Controllers
SG3842J	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3842M	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3842N	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3842Y	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3843D	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER
SG3843DM	MICROSEMI	获取价格	CURRENT MODE PWM CONTROLLER

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