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RS2254PP Datasheet(PDF) 1 Page - Orister Corporation |
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RS2254PP Datasheet(HTML) 1 Page - Orister Corporation |
1 / 9 page Page No. : 1/9 DS‐RS2254‐11 May, 2010 www.Orister.com RS2254 Second‐Side Regulation Current Mode PWM Power Switcher General Description RS2254 combines a dedicated current mode PWM controller with a high voltage power MOSFET. It is optimized for high performance, low standby power, and cost effective off‐line flyback converter applications in sub 15W range. RS2254 offers complete protection coverage with automatic self‐recovery feature including Cycle‐by‐Cycle current limiting (OCP), over load protection (OLP), VDD over voltage clamp and under voltage lockout (UVLO). Excellent EMI performance is achieved with Orister proprietary frequency Jiggling technique together with soft switching control at the totem pole gate drive output. The tone energy at below 20KHz is minimized in the design and audio noise is eliminated during operation. RS2254 is offered in DIP‐8 package. Features Applications ● Power on Soft Start Reducing MOSFET VDS Stress ● Frequency Jiggling to reduce EMI ● Burst Mode Control For Improved Efficiency and Minimum Standby power Design ● Audio Noise Free Operation ● Fixed 50KHz Switching Frequency ● Internal Synchronized Slope Compensation ● Low VDD Startup Current and Low Operating Current ● Leading Edge Blanking on Current Sense Input ● Good Protection Coverage With Auto Self‐Recovery ◎ VDD Over Voltage Clamp and Under Voltage Lockout with Hysteresis (UVLO) ◎ Line Input Compensated Cycle‐by‐Cycle Over‐current Threshold Setting For Constant Output Power Limiting Over Universal Input Voltage Range ◎ Overload Protection (OLP) ◎ Over Voltage Protection (OVP) ● RoHS Compliant and 100% Lead (Pb)‐Free and Green (Halogen Free with Commercial Standard) ● Battery Charger ● Digital Cameras and camcorder Adaptor ● PDA power supplies ● VCR, SVR, STB, DVD & DVCD Player SMPS ● Set‐Top Box (STB) Power ● Auxiliary Power Supply for PC and Server ● Open‐frame SMPS Application Circuits VOUT GND C2 C1 -+ D1 2 4 R1 L1 C3 D2 Naux U2 1 2 3 4 C7 R3 R2 C4 D5 RS431 T1 D3 C5 R5 R7 R8 R9 R10 D4 R6 C6 C8 U1 RS2254 VDD FB SENSE DRAIN DRAIN VDDG GND GND R4 Np Ns AC IN |
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