ZXLD383 Datasheet, PDF (1/10 Pages) Zetex Semiconductors – Single or multi cell LED driver with enable/rectifier input for solar charged lamp applications

A Product Line of
Diodes Incorporated
ZXLD383
Single or multi cell LED driver with enable/rectifier input for solar
charged lamp applications
Description
Summary
The ZXLD383 is a single or multi cell LED
driver designed for applications requiring
step-up voltage conversion from a very low
input voltage. The IC generates constant
current pulses that are ideal for driving single
or multiple LEDs over a wide range of
operating voltages. It includes an on/off
enable input that can be driven directly from
a photocell array or an open collector/drain
logic output. The enable input features an
ultra-low voltage drop diode to ground,
eliminating the need for a photocell array
isolation diode in Garden Light applications.
Features
• 85% efficiency
• User adjustable output current
• Single cell operation
• Low saturation voltage
• TSOT23-5 package
• Available also in die form
• Simple application circuit
The ZXLD383 uses a PFM control technique to
drive an internal switching transistor which
exhibits a low saturation resistance. This
ensures high efficiency, even for input voltages
as low as 1.0V.
The IC can start up under full load and operates
down to an input voltage of below 0.9V.
The ZXLD383 is offered in the space saving
TSOT23-5 package or in die form, offering an
excellent cost vs performance solution for
single cell LED driving applications.
Applications
• Garden lights
• Door/pathway illumination
• LED flashlight and torches
• LED backlights
• White LED driver
• Gated boost supply generator
D iode Array
ENA
Z XLD 383
1
5 ^VCC
GND ₂
N IMH
1.2V
NC
3
4 ^VOUT
L1
LED
Issue 1 - September 2008
1
© Diodes Incorporated, 2008
www.zetex.com
www.diodes.com