简介： Outline In recent years switching power supplies have been required to be not only compact and light weight but also to have low power consumption and a high power factor. A current resonant converter is applied, because it is superior to other topology from the viewpoint of low noise and efficiency. However at light loads efficiency is low and several watts of loss occur even at no load. This means that a sub-power supply is required at standby time which adds to the size of the unit. Fuji Electric has utilized the advantages of the current resonant converter and developed a new multi-oscillated current resonant converter with controllability that allows easy power supply design (control method : combine PWM control and self-oscillated control). The M-Power2A series of special power devices have been developed for the Converter. These multiple-chip power devices incorporate two-MOSFET and a special control IC in one package. When the M-Power2A is used with the multi-oscillated current resonant converter, energy is conserved at standby mode without a sub-power supply. Also when the M-Power2A is combined with a PFC circuit, a switching power supply for high power factors can easily be designed. 2．Features 2-1 High efficiency, low noise ・ Two-MOSFET (Q1, Q2) soft switching operation ・ Low-noise secondary-side diode (No surge voltage at reverse recovery) ・ Multi-oscillation means limited increase in frequency for light loads (Frequency increase of 20% of rated load for rated 10% load) and limited reactive power of transformer magnetizing current. 2-2 Fail-safe design: It is easy to construct a fail-safe power supply system. ・ Protection functions with latch shutdown: Over current (OC), over voltage (OV), and over heating (OH). 3. Lineup VDS RDS(ON) VDS RDS(ON) VCC(ON) Tj(OH) MP2A5038 500V 　0.38Ω 500V 0.38Ω MP2A5050 500V 　0.5Ω 500V 0.5Ω MP2A5060 500V 　0.6Ω 500V 0.6Ω MP2A5077 500V 　0.77Ω 500V 0.77Ω MP2A2013 250V 　0.125Ω 250V 0.125Ω Type Name 16.5V 125 ～ 150 ℃ MOS-FET (Q1) MOS-FET (Q2) Control