ZXLD1366 Datasheet, PDF (1/32 Pages) Diodes Incorporated – High accuracy 1A, 60V LED driver with internal switch

A Product Line of
Diodes Incorporated
ZXLD1366
High accuracy 1A, 60V LED driver with internal switch
Description
The ZXLD1366 is a continuous mode
inductive step-down converter, designed for
driving single or multiple series connected
LEDs efficiently from a voltage source higher
than the LED voltage. The device operates
from an input supply between 6V and 60V and
provides an externally adjustable output
current of up to 1A. Depending upon supply
voltage and external components, this can
provide up to 48 watts of output power.
The ZXLD1366 includes the output switch and
a high-side output current sensing circuit,
which uses an external resistor to set the
nominal average output current.
Output current can be adjusted above, or
below the set value, by applying an external
control signal to the 'ADJ' pin.
Features
• Typically better than 0.8% output current
accuracy
• Available in thermally enhanced DFN
package
• Simple and with low part count
• Single pin on/off and brightness control
using DC voltage or PWM
• PWM resolution up to 1000:1
• High efficiency (up to 97%)
• Wide input voltage range: 6V to 60V
• Inherent open-circuit LED protection
Pin connections
LX 1
5 V_IN
LX
GND 2
GND
ADJ 3
4 I_SENSE ADJ
TSOT23-5
Top view
DFN633
Top view
V_IN
GND
I_SENSE
The ADJ pin will accept either a DC voltage or a
PWM waveform. Depending upon the control
frequency, this will provide either a continuous
(dimmed) or a gated output current. Soft-start
can be forced using an external capacitor from
the ADJ pin to ground.
Applying a voltage of 0.2V or lower to the ADJ
pin turns the output off and switches the device
into a low current standby state.
Applications
• Low voltage halogen replacement LEDs
• Automotive lighting
• Low voltage industrial lighting
• LED back-up lighting
• Illuminated signs
• Emergency lighting
• SELV lighting
• LCD TV backlighting
• Refrigeration lights
Typical application circuit
D1
VIN (24V)
Rs
0.2⍀
C1 4.7␮F
VIN
100nF
ADJ
GND
L1
ISENSE
LX
ZXLD1366
GND
Issue 2 - September 2008
1
© Diodes Incorporated 2008
www.zetex.com
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