Low Standby Power SMPS Controller

NCP1225 is a low standby power Switch−Mode Power Supply, SMPS controller IC specially designed for low power AC−DC adapter applications. The device operates in Discontinuous Conduction Mode (DCM) with Pulse Frequency Modulation (PFM) control scheme. PFM operation can provide high operating efficiency even at light loading conditions and the device itself takes extremely low operating current. With careful circuit design, low standby power down to 300 mW can be achieved for universal line input low power adapters. This specific feature can help the end products to comply with immediate and future international power saving regulations easily.

FEATUREs
• Current Mode Operation
• Cycle−By−Cycle Current Limiting
• High Efficiency Pulse Frequency Modulation (PFM) Control
• Low Device Operating Current, 0.5 mA Typical
• No Optocoupler Feedback Control
• Extremely Low Standby Power
• Internal Leading Edge Blanking
• Input Undervoltage Lockout Protection
• Output Overvoltage Protection
• Optional Optocoupler Feedback
• Micro Miniature TSOP−5 Package

Typical Applications
• Low Power Wall Mount Adapters
• Mobile Phone Adapter Chargers
• TV/Computer Auxiliary Power Supply