zxld1356 Zetex Semiconductors plc., zxld1356 Datasheet

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zxld1356

Manufacturer Part Number
zxld1356
Description
High Accuracy 550ma, 60v Led Driver With Internal Switch
Manufacturer
Zetex Semiconductors plc.
Datasheet

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ZXLD1356
High accuracy 550mA, 60V LED driver with internal switch
Description
The
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 550mA. Depending upon
supply voltage and external components, this
can provide up to 30 watts of output power.
The ZXLD1356 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
Pin connections
Issue 2 - September 2008
© Diodes Incorporated 2008
GND
ADJ
LX
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
1
2
3
ZXLD1356
TSOT23-5
Top view
5
4
V
I
SENSE
IN
is
a
GND
ADJ
LX
continuous
1
2
3
DFN633
Top view
4
6
5
mode
V
GND
I
SENSE
IN
1
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
Typical application circuit
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
V
IN
(24V)
Diodes Incorporated
GND
C1
A Product Line of
100nF
4.7 F
ADJ
V
IN
D1
0.36
Rs
ZXLD1356
I
SENSE
GND
www.diodes.com
www.zetex.com
L1
LX

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