【应用】降压芯片KP35026VGA应用于WIFI智能灯泡供电，非隔离500V高耐压输入，降压固定输出3.3V

时间： 2022-02-03 来源：世强

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互联网无处不在，随时随地的互通、互动的时代特征，影响到节能灯泡产品的发展和演变，由传统开关按键控制，慢慢的变为无线WIFI远程控制的智能灯泡越来越多。在智能灯泡产品中，有应用到降压芯片，一般为中压或低压输入，相对于高压输入的芯片，市场上还是比较少。本文推荐必易微降压芯片的KP35026VGA，可应用非隔离500V高耐压输入，降压固定输出3.3V，应用于WIFI智能灯泡供电。

先看一下智能灯泡的部分电路框图：

从框图可以看出KP35026VGA芯片给WIFI模块供电3.3V，使模块能正常工作。电路框架相对简单，市电220V交流电压输入，经过整流电路有约311V以上电压，直流输入到KP35026VGA，通过KP35026VGA电路降压，输出3.3V给WIFI模块供电，省略了一般的开关降压，及变压器，从而降低了成本。

下面我们来介绍KP35026VGA的一些参数特性：

1：固定输出3.3V，快速动态响应，满足WIFI供电需求。

2：空载待机功耗低于20mW，耗电小。

3：内部集成续流二极管，集成500V高压MOSFET和高压启动电路，外围元件少。

4：输出额定电流300mA，带载能力强，满足WIFI模块电流需求。

5：内置多重保护，如过载保护(OLP)，逐周期电流限制(OCP)，异常过

流保护(AOCP)，输出过压保护(OVP)，过温保护(OTP)等，保障产品性能。

6：具有优于传统的PWM控制器不同，KP35026VGA内部无固定时钟驱动MOSFET,系统开关频率随负载变化可实现自动调节，提高产品稳定性。

7: 工作结晶温度范围-40°C~+125°C，满足消费类产品应用环境。

8：接下来我们看一下封装SOP-4(5x7mm)，封装较小：

以下为典型参考应用电路图，外围元件少。

KP35026VGA参数上有电压范围广；多重保护；大电流输出；电路外围元件少；打破传统固定PWM控制方式等优点。目前已大批量出货，产品性能稳定。在方案开发应用中，世强可以提供及时的技术服务，在货源上能给于稳定供货支持。

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2024-06-18 - 原厂动态代理服务技术支持批量订货

必易微LED芯片选型表

必易微提供以下技术参数LED产品的选型，MOS耐压：40V-600V，导通阻抗:0.25Ω-18Ω，工作模式：临界连续、开关、断续、Linear

Iout Vin=176-264Vac 72Vout

选型表 - 必易微立即选型

【产品】OTP分段可调的降压型高功率因数LED恒流功率开关KP12684FM，全电压功率因数＞0.9

必易微推出的降压型高功率因数LED恒流功率开关KP12684FM是高度集成的恒流LED功率开关，芯片采用了准谐振的工作模式，同时加以有源功率因数校正控制技术可以满足高功率因数、低谐波失真和高效率的性能。

2022-06-17 - 产品代理服务技术支持批量订货

必易微携全屋智能产品解决方案亮相第19届（顺德）家电电源与智能控制技术研讨会

2024年4月25日，由 Big-Bit 商务网主办的第 19 届（顺德）家电电源与智能控制技术研讨会在佛山顺德顺利召开。必易微在展位现场为智能家居客户带来 AC-DC、DC-DC、驱动 IC 等多款高性能、高可靠性的整体芯片解决方案。

2024-05-13 - 原厂动态代理服务技术支持批量订货

【产品】降压式恒流LED功率开关KP1465X采用PWM调光，调光范围1%~100%宽，待机损耗低至10mW

必易微推出的KP1465X系列是高度集成的降压型恒流 LED 功率开关，内部集成有500V高压MOSFET和650V高压供电电路，芯片采用了准谐振的工作模式，无需辅助绕组检测消磁。同时KP1465X还集成了独有的调光技术，能提供高精度的PWM信号调光。

2022-07-18 - 产品代理服务技术支持批量订货

【产品】集成高压启动电路的降压型准谐振式LED恒流功率开关KP1052A/B/C/D/E，±4%恒流精度

必易微电子（KIWI）的KP1052A、KP1052B、KP1052C、KP1052D、KP1052E是内部高度集成的降压型准谐振式LED恒流功率开关。在同一个晶圆上，KP1052A/B/C/D/E集成有高压功率MOSFET和控制器。此外，芯片还集成有高压启动电路和无需辅助绕组的电感电流过零检测电路。

2020-08-13 - 新产品代理服务技术支持批量订货