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SAQ8818 Datasheet PDF - SAQCN

Part Number SAQ8818
Description High Performance PWM Controller
Manufacturers SAQCN 
Logo SAQCN Logo 

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SAQ8818 datasheet, circuit
SAQ8818 V1.0
SPECIFICATION FOR APPROVAL
PRODUCT
PRODUCT DES
CUSTOMER
DATE
OR R&D
:
:
:
:
APPROVED BY
NOTE
High Performance
---PWM Controller
CUSTOMER SIGNATURE (S)
The information given in this document is carefully checked and believed to be reliable. SAQ reserves the right
to make changes in product or specification at any time and without further notice. SAQ products are not
intended for use in systems in which failures of product could result in personal injury. All mentioned
trademarks are registered trademarks of their owner.
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SAQ8818 equivalent
SAQ8818 V1.0
功能说明:
用户可选功能
该芯片提供了多种运用方案、灵活的各种功能供用户选择,用户可通过外围电路的灵活设置,而
达到自己想要的功能与作用,具体方法请在技术指导下参考设计。
宽供电电压
系统提供了5-45V的供电电压直接输入功能,而无需外接稳压电路。
参考基准电压
一个内置的参考基准电压,提供了高精度、低温度系数的基准电压。通过放大或分压该基准电压,
产生电路中其它需要的电压基准。
过压箝位
当在第十二脚CLAMP端检测到大于2.0V的电压时,内部误差放大器会限制输出,以抑制和平衡灯
管的启动电压,故障时的工作电压。
开关功能
IC的第七脚为低电平时,提供了不需关闭电源而“开/关”芯片输出的功能;当芯片关闭时,所
有的输出被强制为逻辑低电平。
设置灯管工作频率
灯管的工作频率可通过第十三、第十四脚共同实现,当需要一个高精度的频率时,可用一个低误
差的可调电阻来实现。其工作频率的计算一般为当设置CT=0.01UFRT=12KΩ时,其频率约为10KHZ
特别留意CT的值不要小于0.0047UF,否则电路振荡将可能不正常。
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