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ZXLD1362EV3 USER GUIDE
DESCRIPTION
The ZXLD1362EV3, Figure 1, is a PCB constructed using an aluminium base for evaluating the ZXLD1362 LED
driver with internal switch [1]. The evaluation board can be used to drive an external choice of LEDs; the total forward
voltage across the LEDs depending on the number and type connected.
The operating voltage is nominally higher than 30V for the external LEDs, and can be raised to 60V maximum, which
will reduce the supply current. Please refer to the Zetex ZXLD1360 and ZXLD1350 products for applications requiring
input voltages lower than 30V.
The nominal current for the evaluation board is set at 700mA with a 0.15Ω sense resistor, R1.
The 68uH inductor used in the circuit is based on a 30V nominal supply, which should be connected across +VIN and
GND pins.
Note: The evaluation board does not have reverse polarity protection. It is fitted with a 2.1mm DC power plug with
positive to the centre pole.
Test point ADJ provides a connection point for DC or PWM dimming and shutdown.
Warning: with 700mA output, the connected LED will be hot and very bright
Figure 1: ZXLD1362EV3 evaluation board
ZXLD1362EV3 User Guide issue 1
1/7
11-01-2008
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Summary of Contents for Zetex ZXLD1362EV3
- Page 1 ZXLD1362EV3 USER GUIDE DESCRIPTION The ZXLD1362EV3, Figure 1, is a PCB constructed using an aluminium base for evaluating the ZXLD1362 LED driver with internal switch [1]. The evaluation board can be used to drive an external choice of LEDs; the total forward voltage across the LEDs depending on the number and type connected.
- Page 2 Input voltage: 7V to 60V. Decouple to ground with a 100nF and a 10uF or higher ceramic capacitor depending on the input voltage[1]. EVALBOARD ORDER NUMBER ZXLD1362EV3 Please note: Evaluation boards are subject to availability and qualified leads. ZXLD1362EV3 User Guide issue 1 DEVICE APPLICATIONS • LED flashlights. • High Power LED driving.
- Page 3 ZXLD1362EV3 EVALUATION BOARD REFERENCE DESIGN The ZXLD1362EV3 is configured to the reference design in Figure 2. The target application is a driver for one or more series-connected LEDs for luminaires in both commercial and automotive applications. The maximum operating voltage is 60V, and the nominal current is set at 700mA with a 0.15Ω sense resistor R1. The device operates in continuous mode at approximately 150 kHz, with a 68uH inductor.
- Page 4 Care must be taken in their placement. Warning: At 60V operation with 700mA output, the board temperature rises by around 50C from ambient after 30 minutes of operation. Figure 3: Component layout and circuit board view ZXLD1362EV3 User Guide issue 1 Part Number CRL1220 R15TD Generic NACEW100M1006.3x8TR13F...
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Page 5: Circuit Features
R1 can be calculated using following equation : R1 = 0.1(V / I ) where ZXLD1362EV3 User Guide issue 1 = the LED current. R1 = the sense resistor value in ohms. 0.1V is the nominal sense voltage with ADJ open circuit or set to 1.25V. - Page 6 With a 60V supply and 15 LEDs, the switching frequency is typically 200 kHz and efficiency levels >90% are achievable. Visit our website www.zetex.com to find useful tools for circuit design and simulation. REFERENCE [1] ZXLD1362 Datasheet – www.zetex.com ZXLD1362EV3 User Guide issue 1 11-01-2008...
- Page 7 Zetex products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Zetex Semiconductors plc. As used herein: Life support devices or systems are devices or systems which: 1.