Zetex ZXLD1362EV3 manual

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Table of contents for the manual

  • Page 1

    ZXLD1362EV3 User Guide issu e 1 1/7 11-01-2008 ZXLD1362EV3 USER GUIDE DESCRIPTION The ZXLD1362EV3, Fig ure 1, is a PCB c onstructed using an aluminium base for e valuating the ZXLD13 62 LED driver with internal switch [1]. The evaluation board can be used to drive an exter nal choice of LEDs; the total forward voltage across the LEDs depending o n [...]

  • Page 2

    ZXLD1362EV3 User Guide issu e 1 2/7 11-01-2008 ZXLD1362 DEVICE DESCRIPTION The ZXLD1362 is a continu ous mode inductive driver in a TSOT23-5 packag e, for driving one or more seri es connected LEDs efficientl y from a voltage source higher than the LE D voltage. T he device includ es the output switch and a current sense circuit, which requires an [...]

  • Page 3

    ZXLD1362EV3 User Guide issu e 1 3/7 11-01-2008 ZXLD1362EV3 EV ALUATION BO ARD REFERENCE DESIGN The ZXLD1362EV3 is config ured to the reference design in Figure 2. The target applic at ion is a driver for one or more series-connected LEDs for luminaires in both commercial a nd automotive applications. The maximum oper ating voltage is 60V, and the n[...]

  • Page 4

    ZXLD1362EV3 User Guide issu e 1 4/7 11-01-2008 ZXLD1362 Operation In normal operation, when voltage is ap plied at +VIN, th e ZXLD1362 intern al NDMOS switch is turned on. Cu rrent starts to flow through sense re sistor R1, inductor L1, and the LEDs. The current r amps up linearly, and the ramp rat e is determined by the in put voltage +VIN and the[...]

  • Page 5

    ZXLD1362EV3 User Guide issu e 1 5/7 11-01-2008 ZXLD1362EV3 Connection Point Definition Name Description +VIN Positive supply voltage. GND Supply Ground (0 V). ADJ Internal voltage ref. pin (1.25V). This pin can be used to achiev e dimming and soft-start, and for switching the output current off. • Leave floating for normal operation. • See &apo[...]

  • Page 6

    ZXLD1362EV3 User Guide issu e 1 6/7 11-01-2008 PERFORMANCE The system efficiency depends on the sens e resistor, supp ly voltage, s witching induct or, and the number of LEDs. With a 60V suppl y and 15 LEDs, the s witching frequency is typic ally 200 kHz and efficie ncy levels >90% ar e achievable. Visit our website www.zetex.com to find useful [...]

  • Page 7

    ZXLD1362EV3 User Guide issu e 1 7/7 11-01-2008 Definitions Product change Zetex Semiconductors reserves the r ight to alter, without no tice , specifica tions, design, price or cond itions of supply of any product or service. Customers are solely responsible for o btaining the latest re levant information before placing orders. Applications disclai[...]