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Zetex ZXLD1350EV User Manual

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ZXLD1350EV4
ZXLD1350EV4 EVALUATION BOARD USER GUIDE
DESCRIPTION
The ZXLD1350EV4, Figure 1, is an evaluation board for evaluating the ZXLD1350 350mA LED driver with internal
switch. The evaluation board can be used to drive 1, 2 or 3 one-watt LEDs, or an external choice of LEDs. The
number of external connected LEDs depends on the forward voltage of the LEDs connected. The LEDs fitted on this
evaluation board are from the Osram range.
The operating voltage is nominally 24V. For three 1W series-connected LEDs, the voltage can be from 12V minimum
to 30V maximum. The 100uH inductor used in the circuit is based on a nominal 24V supply, which should be
connected across +VIN and GND pins. Note: The evaluation board does not have reverse battery protection. The
nominal current for the evaluation board is set at 300mA with a 0.33Ω sense resistor, Rs.
Jumpers J1, J2 and J3 allow the selection of the number of LEDs to be connected in series. Jumper on at J1
bypasses LED D1. Jumper on at J3 bypasses LED D3. Removing jumper J2 disconnects all the on-board LEDs from
the current flow path. Jumper 2 also doubles as a connection point for an ammeter to measure the LED current.
Before connecting external LEDs across test pins LED+ and LED-, or across J1, remove jumper J2. Jumpers J1 and
J2 can be on or off.
Test point ADJ provides a connection point for DC or PWM dimming and shutdown.
Warning: At 24V nominal operation with 300mA output, the LEDs and the PCB may be hot and the LEDs will be very
bright.
Figure 1: ZXLD1350EV4 evaluation board
Zdb346R1. 05-01-2007
1/8
ZXLD1350EV4 User Guide

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Summary of Contents for Zetex ZXLD1350EV

  • Page 1 ZXLD1350EV4 ZXLD1350EV4 EVALUATION BOARD USER GUIDE DESCRIPTION The ZXLD1350EV4, Figure 1, is an evaluation board for evaluating the ZXLD1350 350mA LED driver with internal switch. The evaluation board can be used to drive 1, 2 or 3 one-watt LEDs, or an external choice of LEDs. The number of external connected LEDs depends on the forward voltage of the LEDs connected.
  • Page 2 ZXLD1350EV4 ZXLD1350 DEVICE DESCRIPTION The ZXLD1350 is a continuous mode inductive driver in a TSOT23-5 package, for driving one or more series connected LEDs efficiently from a voltage source higher than the LED voltage. The device includes the output switch and a current sense circuit, which requires an external sense resistor to set the nominal current up to 350mA.
  • Page 3 ZXLD1350EV4 ZXLD1350EV4 EVALUATION BOARD REFERENCE DESIGN The ZXLD1350EV4 is configured to the reference design in Figure 2. The target application is a driver for one or more series-connected 1W white LEDs for torches and other high powered LED driving applications. The operating voltage is a nominal 24V.

  • Page 4: Evaluation Board

    ZXLD1350EV4 EVALUATION BOARD LED k +VIN In partnership with: LED a OSRAM OPTO SEMICONDUCTOR S Bare board: ZDB346R1 Copyright Zetex Plc 2006 Figure 3: Top View Figure 4: Bottom View Zdb346R1. 05-01-2007 ZXLD1350EV4 User Guide...

  • Page 5: Other Features

    ZXLD1350EV4 ZXLD1350EV4 Connection Point Definition Name Description +VIN Positive supply voltage. Connect a +24V positive supply to this pin. Supply Ground (0V). Connect supply ground to this pin. Internal voltage ref. pin (1.25). This pin can be used to achieve dimming and soft-start, and for switching the output current off.
  • Page 6 ZXLD1350EV4 High Frequency PWM Dimming Switch off the power supply. Insert a 0R 0805 resistor across R1 pads. Ensure C3 is not fitted. Connect a PWM signal to the ADJ pin via an open collector NPN transistor, or an open drain N-channel MOSFET.
  • Page 7 ZXLD1350EV4 Changing the LED current Switch off the power supply. Remove Rs. Calculate and fit a new sense resistor, Rs, the value of which is based on the required LED current without dimming. Rs can be calculated using following equation : Rs = 0.1V/I where = the LED current.
  • Page 8 Terms and Conditions All products are sold subjects to Zetex’ terms and conditions of sale, and this disclaimer (save in the event of a conflict between the two when the terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement.