JTM1221 Controller for Adaptive 100/120Hz Current Ripple Removing Circuit, It is considered that LED is shorted when the cathode voltage of LED is higher than short connecting threshold and remains

                          目录

   1.产品概述      2.产品特点      3.应用范围     4.技术规格书下载（PDF文档）

   5.产品封装      6.电路原理图     7.相关产品

一.产品概述

  JTM1221 is a controller for driving external NMOSFET to remove the 100/120Hz LED current ripple on AC/DC power by a capacitor between VC and GND.

        The adaptive technology of JTM1221 ensures removing LED current ripple.

       JTM1221 clamps the input voltage on VIN pin by 30V. Only one resistor is needed when the output voltage of AC/DC power is higher than 31V.

     JTM1221 allows user to setup maximum LED current by the sensing resistor between the source of NMOSFET and ground, which protects  NMOSFET from being damaged when LED short connected or hot-plug.

     By sensing the drain voltage of NMOSFET via a  resistor between the drain and VLMT  pin,JTM1221 allows user to setup the maximum cathode voltage of LED string, which could help limit the power dissipation on chip.

      It is considered that LED is shorted  when the cathode voltage of LED is higher than short connecting threshold and remains over 60us JTM1221 shuts down NMOSFET when LED is shorted and recovers after 13ms.

     JTM1221 provides over thermal protection. When the temperature of JTM1221 exceed 135 , OTP is trigged. JTM1221 shuts down NMOSFET until the temperature decrease to 110

二.产品特点

Controller for adaptive 100/120Hz current ripple remover

Built-in zener diode for input voltage clamping

VG output voltage high to 10V

Parameters Subject to Change Without Notice

Programmable amplitude of LED current ripple

Programmable maximum cathode voltage of LED

Programmable maximum LED current 

Short protection

Over temperature protection

SOT23-6 Package

三.应用范围

   LED lighting 

四.技术规格书（产品PDF)

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！

五.产品封装图

六.电路原理图

七.相关芯片选择指南