ZXLD1350ET5 Diodes Incorporated

A Product Line of Diodes Incorporated ZXLD1350 30V 350mA LED DRIVER with AEC-Q100 Description Pin Assignments The ZXLD1350 is a hysteretic mode inductive step-down converter with integrated switch and high side current sense. V LX IN It operates from an input supply from 7V to 30V driving single GND or multiple series connected LEDs efficiently external adjustable output current up to 350mA. ADJ I The ZXLD1350 has been qualified to AECQ100 grade 2 SENSE allowing it to operate at ambient temperatures from -40 to TSOT23 -5 105C. Top View The output current can be adjusted by applying a DC voltage or a PWM waveform. 100:1 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. Features Typical Application Circuit Simple low parts count Internal 30V NDMOS switch R L1 S V Internal PWM filter IN 7~30V High efficiency (up to 95% (Note 1) 0.33 47H Wide input voltage range: 7V to 30V 40V transient capability V LX IN SET Up to 1MHz switching frequency C1 Typical 4% output current accuracy ADJ ZXLD1350 1F Qualified to AEC-Q100 Grade 2 Available in Green Molding Compound (No Br, Sb) GND Lead Free Finish/ RoHS Compliant (Note 2) GND Notes: 1. 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. 2. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at: A Product Line of Diodes Incorporated ZXLD1350 30V 350mA LED DRIVER with AEC-Q100 Block Diagram R S V IN L1 D1 V I IN SENSE LX V IN R1 Current sense circuit Voltage 5V regulator - + Shutdown circuit C1 Comparator - MN + ADJ R2 4KHz 200k Vref 1.25V R3 GND Figure 1. Block diagram Pin Connection Pin Description Name Pin No. Description LX 1 Drain of NDMOS switch GND 2 Ground (0V) Multi-function On/Off and brightness control pin: Leave floating for normal operation.(V = V =1.25V giving nominal average output current ADJ REF I =0.1/R ) OUTnom S Drive to voltage below 0.2V to turn off output current () ADJ 3 Drive with DC voltage (0.3V<V <2.5V) to adjust output current from 25% to 200% of I ADJ OUTnom Drive with PWM signal from open-collector or open-drain transistor, to adjust output current. Adjustment range 25% to 100% of I for f>10kHz and 1% to 100% of I for f<500Hz OUTnom OUTnom Connect a capacitor from this pin to ground to increase soft-start time. (Default soft-start time=0.5ms. Additional soft-start time is approx.0.5ms/nF) Connect resistor R from this to V to define nominal average output current I =0.1/R S IN OUTnom S I 4 SENSE (Note: R =0.27V with ADJ pin open circuit) SMIN Input voltage (7V to 30V). Decouple to ground with 1F of higher X7R ceramic capacitor close to V 5 IN device 2 of 22 March 2011 ZXLD1350 Diodes Incorporated www.diodes.com Document number: DS33468 Rev. 8 - 2