STR-X6750B屬于集成電路（IC）的ACDC轉換器離線開關。由三墾電氣株式會社制造生產的STR-X6750BAC DC 轉換器，離線開關該系列是元器件級控制產品，用于構建將交流市電轉換為直流電（通常電壓大幅降低）的設備。集成和未集成系統主要開關元件的器件均包括在內。由于高輸入輸出電壓比，以及此類系統中通常需要隔離，這些器件通常與外部變壓器配合使用。盡管通常使用定制變壓器來實現此用途，但也有許多專門用于此用途的庫存產品，請參見“開關轉換器，SMPS 變壓器”標題。

General Descriptions

The STR-X6700 series products are power ICs for quasi-resonant type switching power supplies, incorporating a power MOSFET and a controller IC, The product achieves high efficiency and low noise power supply systems by the quasi-resonant operation and the bottom-skip quasi-resonant operation.

The STR-W6700 series products are the different package (TO-220F) versions.

特性 Features

● Multi-Mode Control

The operation mode switching with three steps according to load conditions achieves the optimal high efficiency and low noise power supply systems across the full load range. (The confirmation of product number is necessary because some functions are different in each product.)

? In Standby (Under Standby Load Conditions):

－UVLO Intermittent Oscillation by low output voltage --- Switched by Standby Signal, or

－Auto Burst-Oscillation --- Switched Automatically

? Under Low to Middle Load Conditions: Bottom-Skip Quasi-Resonant Operation (Bottom-Skip QR)

? Under Middle to Rating (or Heavy) Load Conditions: Quasi-Resonant Operation (QR)

● Current-Mode Control

● Built-in PWM Oscillator

The PWM operates with the minimum frequency of around 22 kHz, until the quasi-resonant signal becomes valid, reduces the stress on components at startup and load-shorted.

● Soft-Start Function

● Step-Drive Function, reducing switching noise

● Built-in Maximum ON Time Limitation Circuit

The function limits the maximum ON time of power MOSFET, during the transitions at low input voltage, power ON/OFF.

● Input Compensation at Overcurrent

The function reduces the distortion of overcurrent operation point to AC input voltage change by adding three components.

● Built-in Avalanche Energy Guaranteed High-Voltage Power MOSFET

● Various Protections

Overcurrent Protection (OCP) -------------------------------Pulse-by-Pulse

Overload Protection (OLP)-----------------------------------Latch Shutdown

Overvoltage Protection (OVP)-------------------------------Latch Shutdown

Applications

Switching Power Supplies for Digital Consumer Equipment; LCD-TVs, PDP-TVs, CRT-TVs, etc., Home Appliances, OA Equipments, Industry Machines, Communication Devices, Others