ZXLD1352ET5TA Diodes Incorporated

PART OBSOLETE - USE AL8860 ZXLD1352 30V 350mA LED DRIVER WITH 1000:1 PWM DIMMING AND AEC-Q100 Description Pin Assignments 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 V LX IN externally adjustable output current up to 350mA. The ZXLD1352 has been qualified to AEC-Q100 Grade GND 2 allowing it to operate at ambient temperatures from -40 to +105C. DC voltage or a PWM waveform. 1000:1 adjustment of ADJ I SENSE output current is possible using PWM control. Applying a voltage of 0.2V or lower to the ADJ pin turns the output off TSOT23-5 and switches the device into a low current standby state. Top View Features Applications Simple Low Parts Count Low Voltage Halogen Replacement LEDs Single Pin on/off and Brightness Control Using DC Automotive Lighting Voltage or PWM Low Voltage Industrial Lighting 1000:1 PWM Dimming Range LED Back-up Lighting * High Efficiency (Up to 95%) Illuminated Signs 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 * 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. Typical Applications Circuit D1 ZLLS1000 Rs V IN (12V - 30V) 0.33 L1 47mH 1F C1 PW M V I LX IN SENSE ADJ ZXLD1352 GND GND 1 of 21 ZXLD1352 April 2018 Diodes Incorporated www.diodes.com Document number: DS33469 Rev. 4 - 4 OBSOLETE PART DISCONTINUED ZXLD1352 PART OBSOLETE - USE AL8860 Pin Descriptions 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. o Adjustment range 0.1% to 100% of I for 100Hz < f < 1kHz OUTnom Connect a capacitor from this pin to ground to define soft-start time. 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 Functional 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 600KHz 50k Vref 1.25V R3 GND 2 of 21 ZXLD1352 April 2018 Diodes Incorporated www.diodes.com Document number: DS33469 Rev. 4 - 4 OBSOLETE PART DISCONTINUED