AC/DC Controller IC for non-dimmable LED lighting

Topology: Flyback
Input Voltage (min.): 240.00 V
Input Voltage (max.): 240.00 V
Switching Frequency (min.): 60.00 kHz
Switching Frequency (max.): 70.00 kHz
Output 1: 50.00 V / 0.130 A

Original publication on 2013-07-25, revision 001


LED driver BD550FHG supports both isolated and non-isolated devices. IC enables simple design of low-power electrical converters. With switching MOSFET and current detection resistor as external devices, it enables more freedom in design. Since the peak current control is utilized, peak currentis controlled in each cycle, application excels wide bandwidth and transient response. BD550FHG includes various protective functions such as soft start function, burst function, per-cycle over current limiter, VCC overvoltage protection and overload protection. An external latch pin (COMP pin) is provided, so that latch stopping (OFF) can be set by external signals.This function is available as overheating protection and over output voltage protection. The PWM switching frequency is fixed at 65 kHz. A frequency hopping function is included which contributes to low EMI.


  • PWM frequency of 65kHz
  • PWM current mode method
  • Low circuit current when UVLO is ON (12μA at VCC=12V)
  • Low circuit current without load
  • (Burst operation when load is light)
  • Built-in SW frequency hopping function
  • 250nsec leading-edge blanking VCC UVLO / OVP
  • Per-cycle over current protection circuit
  • Soft start
  • Output overload protection (Self-restart protection)
  • External latch function for COMP pin (Over heating protection function)


Order Code SPEC Product series Samples
7608000906 PDF PFC Transformer