ZXLD1366_10 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.
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.
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
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
.
Pin Assignments
(TOP VIEW)
LX 1
GND 2
5 V_IN
ADJ ³
TSOT23-5
4 I_SENSE
(TOP VIEW)
LX 1
6 ^V_IN
GND 2
5 GND
ADJ 3
4 I_SENSE
DFN3030-6
(TOP VIEW)
LX 1
GND 2
GND 3
ADJ 4
8 V_IN
7 GND
6 GND
5 ^I_SENSE
SO-8-EP
Typical Application Circuit
D1
V_IN (24V)
Rs
0.2V
C1 4.7mF
V_IN
100nF
ADJ
GND
L1
I_SENSE
LX
ZXLD1366
GND
ZXLD1366
Document number: DS31992 Rev. 5 - 2
1 of 32
www.diodes.com
June 2010
© Diodes Incorporated