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SG3842GAS

更新时间： 2024-02-29 07:20:14
品牌 Logo 应用领域
其他 - ETC 光电二极管信息通信管理控制器
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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SG3842GAS 技术参数

是否Rohs认证：不符合生命周期：Transferred
包装说明：CERAMIC, DIP-8Reach Compliance Code：unknown
风险等级：5.8Is Samacsys：N
模拟集成电路 - 其他类型：SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：25 V
最小输入电压：12 V标称输入电压：15 V
JESD-30 代码：R-CDIP-T8JESD-609代码：e0
功能数量：1端子数量：8
最高工作温度：70 °C最低工作温度：
最大输出电流：1 A封装主体材料：CERAMIC, METAL-SEALED COFIRED
封装代码：DIP封装等效代码：DIP8,.3
封装形状：RECTANGULAR封装形式：IN-LINE
认证状态：Not Qualified子类别：Switching Regulator or Controllers
表面贴装：NO切换器配置：PUSH-PULL
最大切换频率：500 kHz技术：BIPOLAR
温度等级：COMMERCIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：THROUGH-HOLE端子节距：2.54 mm
端子位置：DUALBase Number Matches：1

SG3842GAS 数据手册

 浏览型号SG3842GAS的Datasheet PDF文件第2页浏览型号SG3842GAS的Datasheet PDF文件第3页浏览型号SG3842GAS的Datasheet PDF文件第4页浏览型号SG3842GAS的Datasheet PDF文件第5页浏览型号SG3842GAS的Datasheet PDF文件第6页浏览型号SG3842GAS的Datasheet PDF文件第7页 
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 RT and CT values. 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  
CIN  
RIN  
60  
10u  
1.5M  
50  
40  
30  
20  
10  
0
VCC  
R41  
100  
COMP  
VREF  
Rac  
10k  
OUTPUT  
C21  
0.1u  
R42  
1k  
RT  
SG384x  
10k  
SENSE  
RT/CT  
RS  
C25  
CT  
3.3n  
0.3  
100p  
VFB  
1
1.5  
2
2.5  
3
GND  
COMP VOLTAGE (V)  
© System General Corp.  
Version 1.4 ( IRO33.0007.B3)  
- 1 -  
www.sg.com.tw  
Jun.28,2004  
1234567...19

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 		Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14, ROHS C

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