ZXLD1352 Datasheet, PDF (1/21 Pages) Zetex Semiconductors – 350mA LED driver with internal switch and enhanced PWM dimming range

A Product Line of
Diodes Incorporated
ZXLD1352
30V 350mA LED DRIVER WITH 1000:1 PWM DIMMING AND AEC-Q100
Description
The ZXLD1352 is a continuous mode inductive step-down
converter with integrated switch and high side current sense.
It operates from an input supply from 7V to 30V driving
single and multiple series connected LEDs effciently
externally adjustable output current up to 350mA.
The ZXLD1352 has been qualified to AEC-Q100 Grade
2 allowing it to operate at ambient temperatures from -40 to
105°C.
DC voltage or a PWM waveform. 1000:1 adjustment of
output current is possible using PWM control. 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.
Pin Assignments
LX
GND
ADJ
TSOT23-5
Top View
V_IN
I_SENSE
Features
• Simple low parts count
• Single pin on/off and brightness control using DC voltage
or PWM
• 1000:1 PWM dimming range
• High efficiency (up to 95%)^*
• Wide input voltage range: 7V to 30V
• 40V transient capability
• Up to 1MHz switching frequency
• Typical 4% output current accuracy
• Qualified to AEC-Q100 Grade 2
• Available in Green molding (no Br, Sb) with lead free
finish/RoHS compliant
Applications
• Low voltage halogen replacement LEDs
• Automotive lighting
• Low voltage industrial lighting
• LED back-up lighting
• Illuminated signs
Typical Application Circuit
VIN
(12V - 30V)
D1
ZLLS1000
Rs
0.33
C1 ^1µF
PW M
V_IN
ADJ
GND
L1 47mH
I_SENSE
LX
ZXLD1352
GND
* Using standard external components as specified under electrical characteristics. Efficiency is dependent upon the number of LEDs driven and on external
component types and values.
ZXLD1352
Document number: DS33469 Rev. 3 - 2
1 of 21
www.diodes.com
December 2010
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