STR-W6756 Datasheet PDF – Quasi-resonant Topology IC

Part Number: STR-W6756

Function: Quasi-Resonant Topology Primary Switching Regulator

Package: TO-220 6 Pin Type

Manufacturer: Sanken Electric co.,ltd.


STR-W6756 datasheet


The STR-W6756 is a quasi-resonant topology IC designed for SMPS applications. It shows lower EMI noise characteristics than conventional PWM solutions, especially at greater than 2 MHz. It also provides a soft-switching mode to turn on the internal MOSFET at close to zero voltage (VDS bottom point) by use of the resonant characteristic of primary inductance and a resonant capacitor.

A quasi-resonant topology IC refers to an integrated circuit specifically designed to implement a power supply topology known as quasi-resonant. This type of topology is used in switch-mode power supplies (SMPS) to improve efficiency and reduce electromagnetic interference (EMI).

In a quasi-resonant power supply, the switching of the power semiconductor devices (such as MOSFETs or IGBTs) is synchronized with the resonant frequency of the circuit. This allows for soft switching, which minimizes switching losses and EMI. The quasi-resonant operation helps improve power efficiency and reduces stress on components.

Quasi-resonant topology ICs typically integrate various functions necessary for controlling the power supply, including the resonant circuit control, feedback regulation, protection features, and other control mechanisms. These ICs often provide primary-side control, meaning that the control circuitry is located on the primary side of the power supply, simplifying the overall circuit design.

Features and Benefits

1. Quasi-resonant topology IC – Low EMI noise and soft switching

2. Bottom-skip mode –  Improved system efficiency over the entire output load by avoiding increase of switching frequency

3. Auto-Standby mode – Lowers input power at very light output load condition

4. Avalanche-guaranteed MOSFET – Improves system-level reliability and does not require VDSS derating

5. 650 V / 0.73 Ω

6. Various protections – Improved system-level reliability

Other data sheets are available within the file: STRW6756

STR-W6756 Datasheet PDF Download

STR-W6756 pdf

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