AC/DC Controller IC for non-dimmable LED lighting - BD550FHG

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 current is 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.

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* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BD550FHG-GTR Active SSOP6 3000 3000 Taping Yes
Vin(Min.)[V] 8.5
Vin(Max.)[V] 26.0
Frequency(Max.)[MHz] 0.065
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 110
  • ・ 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)
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Technical Data
Thermal Resistance

The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.