BD555A1AFV Datasheet, PDF (1/18 Pages) Rohm – Electrolytic Capacitor Free Buck Converter LED Driver

BD555A1AFV
Datasheet
LED Driver for Lighting Series
Electrolytic Capacitor Free
Buck Converter LED Driver
BD555A1AFV
●General Description
BD555A1AFV is a LED driver best for LED lighting
applications. It supports dimming. Constant current
switching controller for AC/DC buck converter is
accumulated inside. By choosing external MOS
Transistor, small～large power of LED can be driven.
The driver is adoptable to a wide range of lighting from
small light such as spotlights to large one like base
lights.
With digital power control, the average value of LED
current is stably adjustable to requesting current. By
only primary sense resistor, LED current is available to
feedback LED current is useful without feedback
circuits, reduce parts. Input characteristics and output
characteristics is good by precisely digital power
control.
It’s support electrolytic free design by capacitor
controller which is detect AC voltage and control
ceramic capacitor.
●Key Specifications
■ AC Input range
■ Input Voltage range(AUX pin)
■ Operating temperature
■ Accuracy of output current
80 to 275VAC
10 to 38V
-40 to 100℃
±1.5 %( Typ.)
●Features
■ Highly efficient Buck AC/DC converter
■ Primary control without feedback circuit
■ High accuracy LED current output by LED average
control
■ Capacitor controller for Electrolytic free design
■ Fixed switching frequency
■ Built-in regulator for inner power supply
■ Built-in LED open detection (shutdown type)
■ Built-in UVLO detection
■ Built-in thermal shut-down function
●Packages
SSOP-B14
5.00mm×6.40mm×1.15mm
●Applications
■ Spot light without dimming
■ Desk ramp without dimming
■ Down light without dimming
■ Base light without dimming
●Typical Application Circuits
CAC: 10µF
RAUX1:200kΩ RAUX2:1kΩ
D AUX1:15V
TR3
DAUX2
VBUCK
DFLY
LA: 0.2mH
Cout:
0.1µF
LP: 2mH
DBUCK
VDD2
CAUX:
0.47µF
CVDD2:
2.2µF
VDET
DVDD
DVDD2
CSEL
TESTO
AUX VDD2
VDD1
VOUT
ISENSE
GNDA SOFT GND OSC
CVDD1:
2.2µF
TR1
RISET: 1.5Ω
RSOFT:
100kΩ
ROSC:
100kΩ
Fig.1 Typical Application Circuit
VLED
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
1/15
TSZ02201-0F2F0C300010-1-2
03.AUG.2012 Rev.001