OFFLINE LED DRIVER

The MP4034 is an offline regulator that provides accurate constant-current regulation. The LED driver circuit design is simplified by removing the optocoupler and the secondary feedback components. The MP4034 has an integrated 700V MOSFET. Its variable off-time control allows a flyback converter to operate in discontinuous conduction mode (DCM). The MP4034 also features complete protection functions such as VCC under-voltage lockout, over-voltage protection, over-temperature protection, and open-loop protection. The MP4034"s variable switching frequency provides natural spectrum shaping to smooth the EMI signature, which can reduce the EMI filter’s size and cost.

• Primary-Side–Control without Optocoupler or Secondary Feedback Circuit
• Precise Constant Current Regulation
• Integrated 700V MOSFET with Minimal External Components
• Variable Off-Time and Peak-Current Control
• 550µA High-Voltage Current Source
• Up to 7W Output Power
• Over-Voltage Protection
• Over-Temperature Protection
• Open-Loop Protection
• Natural Frequency Dithering for Improved EMI Signature
• Low Cost and Simple External circuit
• SOIC8-7A Package