【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

技术问答

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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