Shindengen Launched a Control IC for Quasi Resonant Power Supplies which Can Reduce Standby Power by 38%

SHINDENGEN Electric Manufacturing Co., Ltd. has launched the MS1007SH, a control IC for quasi resonant power supplies, equipped with a standby power reduction function.

This product can greatly reduce standby power via burst mode and can also improve efficiency under light loads via a bottom skip function.
This contributes to the energy saving measures in demand for household white good power supplies and industrial equipment power supplies.

This IC can also make high efficiency power supply design safer and easier through a variety of high value-added functions and thorough protection functions. Sales of this product are expected to begin in December 2021.

Overview

There has been a focus on reducing energy consumption in refrigerators, washing machines, and other white goods as well as in industrial equipment as a means of preventing global warming, and there is also demand for high efficiency in the flyback circuits used as control power supplies for many of these devices.

There is a great deal of interest in reduction of device standby power consumption and improvement of power supply efficiency under light loads in particular.

In order to respond to these market needs, Shindengen has launched the MS1007SH, a control IC for quasi resonant power supplies, equipped with a standby power reduction function.

This product features an auto burst function which automatically shifts to burst mode during standby to reduce standby power, and a bottom skip function which lowers the oscillation frequency under light loads to improve efficiency, which combine to realize a 38% reduction in standby power and a 24% improvement in efficiency under light loads.

The product also reduces the number of components by integrating a burst mode circuit and IC peripheral circuits, and incorporates thorough protection functions in order to simplify power supply design.

Features

· Auto burst function [Fig.1]

· Bottom skip function [Fig.2]

· Built-in HV Startup circuit

· Built-in 4step soft start function

· Built-in soft drive circuit

· Thorough protection functions
· Vcc-GND short protection
· Overload protection (automatic recovery)
· Overvoltage protection (automatic recovery)
· Overheat protection (automatic recovery)

· Contributes to simplification of design by reducing the number of components [Fig.3]

· RoHS compliant, Pb free

Fig.1 Auto burst function

Automatically switches to burst mode during standby.
Reduces the number of switching operations to reduce power dissipation.

Fig.2 Bottom skip function

Bottom skip function lowers oscillation frequency during light loads to improve efficiency.

Fig.3 Contributes to simplification of design by reducing the number of components

Reduces the number of components for input calibration circuits by 4.
Reduces the number of components for burst circuits by 4.

Specifications

Typical Applications

・Household white goods power supplies.
・Industrial equipment power supplies.
・Other various types of power supplies.