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SDH771XRH

The SDH771XRH is a high accuracy LED constant current driver IC, it is applicable to non-isolated buck LED constant current power system with full AC input voltage range of 85VAC~265VAC.

The SDH771XRH creatively integrates a rectifier bridge, 500V high-voltage power MOSFET, and a 600V freewheeling diode, which greatly simplifies the requirements for peripheral device; moreover, it integrates a built-in high-voltage power circuit, it is able to supply power to itself without any startup resistor or auxiliary winding, and at the same time, a conventional external power supply capacitor is omitted, which greatly shortens the startup time as well as saves the system cost.

The SDH771XRH works in inductor current boundary conduction mode, it uses a unique high-accuracy current sense technology, combined with internal compensation, can achieve high constant current accuracy and excellent line/load regulation. It provides various protections, such as output short/open circuit protection, cycle-by-cycle over current protection, over temperature regulation, over temperature protection, and open circuit protection for sensing resistor, which greatly improves the system safety and reliability. The open-circuit protection voltage can be set externally through the ROVP pin.


Main feature


  • Integrated bridge rectifier

  • Integrated 600V ultra-fast recovery diode

  • Available 500V high voltage power MOSFET in one package with stable performance

  • Integrated high-voltage power supply, without the need for any    external starting resistance or VCC capacitor

  • Accurate constant current (<±3%) supplied to LED

  • Output short/open circuit protection

  • Open circuit protection threshold value external adjusted, strong resistance to moisture and interference

  • Over temperature regulation

  • Over temperature protection

  • Cycle-by-cycle over current protection

  • No auxiliary winding


Ordering Information
Product Name Package form Marking Hazardous Substance Control Packing Type Remarks
SDH7711ARH ASOP-7 SDH7711ARH Halogen free Tape&Reel
SDH7711RHTR ASOP-7 SDH7711RH Halogen free Tape&Reel
SDH7712RHTR ASOP-7 SDH7712RH Halogen free Tape&Reel
Block Diagram

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