Datasheet
AC/DC Drivers
AC/DC Controller IC
for non-dimmable LED lighting
BD550FHG
●General Description
●Key Specifications
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.
Power Supply Voltage range:
8.5V to 25.0V
Operating Current:
Normal:
Burst:
0.60mA (Typ)
0.40mA (Typ)
65kHz (Typ)
-40°C to +110°C
Oscillation Frequency:
Operating Temperature range:
●Package
W(Typ) x D (Typ) x H (Max)
2.90mm x 2.80mm x1.25mm
SSOP6
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.
●Features
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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)
●Applications
Electrical machineries for LED lighting
■
■
■
Built-in SW frequency hopping function
250nsec leading-edge blanking
VCC UVLO / OVP
■
■
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Per-cycle over current protection circuit
Soft start
Output overload protection (Self-restart protection)
External latch function for COMP pin
(Over heating protection function)
●Typical Application Circuit
Figure 1, Application Diagram (Non-Isolated Type)
○Product structure:Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
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TSZ02201-0F1F0C300020-1-2
2013.07.25 Rev.001
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