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SG6846ACSZ

更新时间： 2024-10-28 03:32:27
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 开关控制器
页数 文件大小 规格书
13页 484K
描述
Highly Integrated Green-Mode PWM Controller

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SG6846ACSZ 技术参数

是否Rohs认证： 符合生命周期：Obsolete
零件包装代码：SOIC包装说明：SOP, SOP8,.25
针数：8Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.68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：20 V最小输入电压：11.5 V
标称输入电压：15 VJESD-30 代码：R-PDSO-G8
长度：4.813 mm功能数量：1
端子数量：8最高工作温度：85 °C
最低工作温度：-20 °C封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP8,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
认证状态：Not Qualified座面最大高度：1.752 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：SINGLE最大切换频率：136 kHz
温度等级：OTHER端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
宽度：3.899 mmBase Number Matches：1

SG6846ACSZ 数据手册

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Product Specification  
Highly Integrated Green-Mode PWM Controller  
SG6846A  
consumption, a proprietary green-mode function provides  
off-time modulation to continuously decrease the  
switching frequency under light-load conditions. Under  
zero-load conditions, the power supply enters burst-mode.  
FEATURES  
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Two-level OCP with 1700ms delay time  
Output short-circuited delay time: 100ms  
Low start-up current (8µA)  
The SG6846A is especially designed for SMPS with  
surge-current output, incorporated with a two-level OCP  
function. Besides the cycle-by-cycle current limiting, if  
the switching current is higher than two thirds the  
peak-current threshold for 1700ms, over-current  
protection is activated and the SG6846A latches off.  
Low operating current (3.7mA)  
Peak-current mode operation with cycle-by-cycle  
current limiting  
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Programmable PWM frequency with frequency  
hopping  
If the switching current is higher than two thirds the  
peak-current threshold for 100ms and the voltage on the  
VDD pin is higher than VDD-OFF + 1V, the PWM pulses  
are latched off immediately once VDD voltage is lower  
than VDD-OFF + 1V; useful if an output short-circuit occurs.  
PWM frequency continuously decreasing with burst  
mode at light loads  
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VDD over-voltage protection (OVP)  
AC input brownout protection with hysteresis and  
constant output power limit  
SG6846A also integrates a frequency hopping function  
that reduces EMI emission of a power supply with  
minimum line filters. Its built-in synchronized slope  
compensation provides proprietary internal compensation  
for constant output power limit over a universal AC input  
range. Also, the gate output is clamped at 18V to protect  
the external MOSFET from over-voltage damage.  
Internal soft-start is built-in to reduce stress on the  
MOSFET and start-up current during power-on period.  
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Constant output power limit (full AC input range)  
Internal latch circuit for OVP, OTP, and OCP  
Built-in soft-start  
Open-loop protection with 1700ms delay time  
APPLICATIONS  
General-purpose switch-mode power supplies and  
flyback power converters, including:  
Other protection functions include: AC input brownout  
protection with hysteresis, VDD over-voltage protection,  
and over-temperature protection. For over-temperature  
protection, an external NTC thermistor can be applied to  
sense the ambient temperature. When OCP, VDD OVP, or  
OTP are activated, an internal latch circuit is used to  
latch-off the controller. The PWM pulses stay latched off  
until the power supply is unplugged from the main outlet.  
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Power adapters  
Open-frame SMPS  
Specifically fit for SMPS with surge-current output  
(such as for printers, scanners, motor drivers, etc.)  
DESCRIPTION  
The highly integrated SG6846A series of PWM  
controllers provides features to enhance the performance  
of flyback converters. To minimize standby power  
SG6846A is available in an 8-pin SOP package.  
TYPICAL APPLICATION  
© System General Corp.  
Version 1.1.1 (IAO33.0059.B1)  
- 1 -  
www.sg.com.tw • www.fairchildsemi.com  
September 26, 2007  
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