深圳市三佛科技有限公司供应FT839NB1-RT辉芒微SOP8贴片六级能效电源芯片,原装现货
辉芒微代理商
原装,库存现货,技术支持,价格优势
描述
The FT839NX/FT839MX controller device is optimized for high-performance, low power switching mode power supply applications. The FT839NX/FT839MX facilitates CC/CV charger design by eliminating an opto-coupler and TL431. Its highly integrated functions such as Under Voltage Lockout (UVLO), Leading Edge Blanking (LEB) and built-in cable compensation offer the users a high efficiency and low cost solution for AC/DC power applications.
Power supplies built with FT839NX/FT839MX can achieve both highest average efficiency, fast dynamic load response and super low standby power. FT839NX and FT839MX satisfy DoE Level 6 requirements with production margin from 5V/1A to 5V/2.4A applications, respectively.
Furthermore, FT839NX/FT839MX features fruitful protections like Open Circuit Protection and Over Temperature Protection to eliminate the external protection circuits and provide reliable operations. FT839NX is available in SOP8/DIP8 package. FT839MX is available in SOP8 package.
特性
Constant-Current (CC) and Constant-Voltage (CV) with Primary Side Control
Proprietary technology enabling high efficiency and fast dynamic response
Satisfy DoE Level 6 requirements from 5V/1A to 5V/2.4A applications
No audible noise over entire operating range
Optimization for capacitive loading
Built-in power NPN/MOS
Built-in Cable Compensation
Built-in Line Compensation
Primary-side feedback eliminates opto-coupler and TL431
Cycle-by-Cycle Current Limiting
Over Temperature Protection
VCC Over Voltage Protection
CV Open-loop Protection
Excellent capacitive loading start-up performance
售后服务:公司提供样品,并提供产品运用的技术支持。
阿里店铺:阿里 “供应商 ”搜索 ,深圳市三佛科技有限公司,咨询客服购买。
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开关式AC/DC及DC/DC转换器通过ON/OFF转换进行电压斩波和电容器平滑处理,以稳定提供目标输出电压值。
但是,这种转换在ON/OFF时会产生瞬间漏电流(贯通电流)。也就是说,单位时间内的ON/OFF次数越多,漏电流导致的损失越大,效率越低。
周期恒定(PWM控制)时,即使ON/OFF时间比有变化,其次数在单位时间内也是恒定的。因此,自身功耗量也是恒定的,轻负载时这种转换漏电流造成的损失会导致效率降低。故此,在使用电流少的情况下,通过频率调制(PFM控制)将周期拉长、变慢,从而减少单位时间内的ON/OFF转换次数,以减少损失。这种技术就叫做轻负载模式。为什么需要AC/DC转换器?
那是因为家庭住宅和楼房接收到的电压是100V或200V的AC电压。
然而大家大部分使用的电器是在5V或3.3V的DC电压下工作的。
也就是说,如果不把AC电压转换成DC电压,电器就不能工作。
其中也有电机、灯泡等可以用交流电压驱动的产品,但电机与微控制器的控制电路连在一起,灯泡也变成节能LED,因此有必要进行ACDC转换。FT839NB1-RT辉芒微SOP8贴片六级能效电源芯片产品供应