Design guide for LED Lighting Controller XC9401

• 1. General Description
• 2. Product Features
• 3. Block Diagram and Pin Functions
• 4. Typical circuit schematic and reference component table
• 5. Operational explanation
  • 5-1. Normal operation
    • 5-1-1. Current control method and input voltage / input current
    • 5-1-2. Off-time fixed control and calculation of on time/off time
  • 5-2. Startup
  • 5-3. Standby state
  • 5-4. Dimming
  • 5-5. Protective Functions
    • 5-5-1. Over Current Limit
    • 5-5-2. Thermal Shutdown
    • 5-5-3. UVLO
    • 5-5-4. VDD Over-voltage Protection
• 6. Selection of the external components of a non-isolated circuit
  • 6-1. Number of LED Series
  • 6-2. Bridge Diode
  • 6-3. Input Filter
  • 6-4. Power Supply to VDD pin
  • 6-5. Coil
  • 6-6. Flywheel Diode
  • 6-7. MOSFET, Gate Resistor
  • 6-8. LED current adjustment
  • 6-9. Output Capacitor (C4)
  • 6-10. Line regulation improvement circuit
• 7. Selection of the external components of an isolated circuit
  • 7-1. Number of LED Series
  • 7-2. Bridge Diode
  • 7-3. Input Filter
  • 7-4. VSINE Pin
  • 7-5. Power Supply to VDD pin
  • 7-6. Transformer
  • 7-7. Snubber Circuit
  • 7-8. Rectifying Diode
  • 7-9. MOSFET, Gate Resistor
  • 7-10. LED current adjustment
  • 7-11. LED current adjustment
• 8. Examples of solutions and characteristics
  • 8-1-1. 100VAC / 110VAC non-isolated step-down C type
  • 8-2-1. 220VAC / 240VAC non-isolated step-down C type
  • 8-2-2. 220VAC / 240VAC isolated flyback C type
  • 8-3-1. 400VDC non-isolated step-down C type
  • 8-4-1. 15VDC input step-down B type
  • 8-4-2. 10VDC~15VDC input, buck-boost B type
  • 8-5-1. 12VAC input step-down C type
• 9. Usage Cautions