AC/DC Controller IC
for non-dimmable LED lighting
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
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.
Power Supply Voltage range:
8.5V to 25.0V
Normal: 0.60mA (Typ)
Burst: 0.40mA (Typ)
Operating Temperature range:
-40°C to +110°C
W(Typ) x D (Typ) x H (Max)
2.90mm x 2.80mm x1.25mm
■ 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)
Electrical machineries for LED lighting
●Typical Application Circuit
Figure 1, Application Diagram (Non-Isolated Type)
○Product structure：Silicon monolithic integrated circuit
© 2013 ROHM Co., Ltd. All rights reserved.
○This product is not designed protection against radioactive rays