Instruction/ maintenance manual of the product zxld1350ev2 Zetex Semiconductors PLC
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ZXLD1350EV2 ZXLD1350EV2 User Guide Iss 5 10-04-07 ZXLD1350EV2 EVALUATION BOARD US ER GUIDE DESCRIPTION The ZXLD1350EV2, Figure 1, is an evaluation board for ev aluatin g the ZXLD1350 350mA LED driver with internal switch. The evaluation bo ard can be used to drive 1, 2 or 3 one-watt LEDs, or an external cho ice of LEDs.
ZXLD1350EV2 ZXLD1350EV2 User Guide Iss 5 10-04-07 ZXLD1350 DEVICE DESCRIPTION The ZXLD1350 is a contin uous mode inductive driver in a TSOT23-5 packag e, for driving one or m ore series connected LEDs efficientl y from a voltage source higher than the LE D voltage.
ZXLD1350EV2 ZXLD1350EV2 User Guide Iss 5 10-04-07 ZXLD1350EV2 EV ALUATION BO ARD REFERENCE DESIGN The ZXLD1350EV2 is config ured to the reference design in Figure 2. The target appli cat ion is a driver for one or more series-connected 1W white LEDs for torches and other high po wered LED driving applications.
ZXLD1350EV2 ZXLD1350EV2 User Guide Iss 5 10-04-07 ZXLD1350EV2 Evaluation Board . Ref Value Package Part Number Manufacturer Notes R S 0.33R 1%,200ppm 0805 NCST10FR330FT RF NIC components R1,R2 Not fit.
ZXLD1350EV2 ZXLD1350EV2 User Guide Iss 5 10-04-07 U1 +V I N GN D AD J Z X L D1 3 5 0 E V 2 E V AL UAT IO N BO ARD Bar e boar d: Z DB308R3 L1 SD1 JP 2 C3 Copyr ight Z et ex P lc 2006 a k a k a k R1 JP .
ZXLD1350EV2 ZXLD1350EV2 User Guide Iss 5 10-04-07 OTHER FEATURES Dimming The ZXLD1350 provides three dimming options: DC, high-frequ enc y PWM, and low-frequency PW M dimming. DC Voltage Dimming 1. Switch off the power supply. 2. Solder a link across R1 pads.
ZXLD1350EV2 ZXLD1350EV2 User Guide Iss 5 10-04-07 Low Frequency PWM Dimming 1. Switch off the power supply. 2. Solder a link across R1 pads. 3. Make sure C3 is not fitted. 4. Connect a PWM signa l to the ADJ pin via an open co llector NPN transi stor or an open drain N-channe l MOSFET.
ZXLD1350EV2 ZXLD1350EV2 User Guide Iss 5 10-04-07 PERFORMANCE The system efficiency depend s on the sense resistor, suppl y voltage, s witching inductor and the numb er of 1W LEDs connected in series. The graph belo w shows the efficiency with a 0.33 Ω sense resistor R S, and a 100u H inductor, for 1 to 3 series connected 1W LEDs.
ZXLD1350EV2 ZXLD1350EV2 User Guide Iss 5 10-04-07 Definitions Product change Zetex Semiconductors reserves the r ight to alter, withou t notice , spe cifications, design , price or condition s of supply of any product or service. Customers are solely responsible for obtaining the latest r elevant information before placing orders.
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