XR46084ESFTR-ADJ Datasheet, PDF (1/3 Pages) Exar Corporation – Three Terminal Current Controller

XR46084 Product Brief
Three Terminal Current Controller
Description
The XR46084 is a Three Terminal Current Controller (TTCC) for
regulating the current flowing through an LED string.
The application of the XR46084 is configured in parallel with an LED
string. The XR46084 can work as voltage controlled current source,
current regulator, or cut-off. It is suitable for the applications adopting
periodical AC voltage source.
The layout is very flexible allowing for PCB designs in any conceivable
shape. Whether high bay, downlights, or unique architectural shapes
the XR46084 can provide an excellent LED lighting solution.
Typical Application
120VAC
+
ILED
BD
U0
XR46084-ADJ
LEDS1
R0
U1
XR46084-ADJ
R4
LEDS2
R1
FEATURES
■■ System
All solid state components
No electrolytic capacitor required
Compact size to minimize mechanical
cost
Driver-on-board and chip-on-board
available which minimize process flow
and assembly cost
High PF and low THD performance
High efficiency achieved
Flexible PCB layout style
Wide range of LED forward voltage
selection
Distributed heat to several chips
TRIAC dimmable
■■ Chip
88V input sustaining voltage
< 3V dropout voltage for up to 150mA
regulating current
APPLICATIONS
■■ LED Lighting Applications
Downlight
High bay
Specialty
Architectural
R5
U2
XR46084-ADJ
LEDS3
R2
Rectified
V_AC
Q1
XR46000
ZD
U3
I_LED
t
XR46084-ADJ
R3
Figure 1. Typical Application
t
Figure 2. Typical Performance
1/2