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ZXLD1350EV4

 

 

 

Zdb346R1. 05-01-2007 

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ZXLD1350EV4 User Guide 

 
 

Definitions 

Product change 

Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. 
Customers are solely responsible for obtaining the latest relevant information before placing orders. 

Applications disclaimer 

The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for the user’s 
application and meets with the user’s requirements. No representation or warranty is given and no liability whatsoever is assumed by Zetex with 
respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. 
Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory 
duty, restriction or otherwise) for any damages, loss of profit, business, contract, opportunity or consequential loss in the use of these circuit 
applications, under any circumstances. 

Life support 

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: 
A.  

Life support devices or systems are devices or systems which:  
1. are intended to implant into the body  

or  

2. support or sustain life and whose failure to perform when properly used in accordance with instructions  
    for use provided in the labeling can be reasonably expected to result in significant injury to the user. 

B.  

A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the 
failure of the life support device or to affect its safety or effectiveness. 

Reproduction 

The product specifications contained in this publication are issued to provide outline information only which (unless agreed by the company in writing) 
may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the 
products or services concerned.  

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. 
For the latest information on technology, delivery terms and conditions and prices, please contact your nearest Zetex sales office. 

Quality of product 

Zetex is an ISO 9001 and TS16949 certified semiconductor manufacturer. 
To ensure quality of service and products we strongly advise the purchase of parts directly from Zetex Semiconductors or one of our regionally 
authorized distributors. For a complete listing of authorized distributors please visit: 

www.zetex.com/salesnetwork 

 

Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales channels. 

ESD (Electrostatic discharge) 

Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices. The 
possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent of damage can 
vary from immediate functional or parametric malfunction to degradation of function or performance in use over time. Devices suspected of being 
affected should be replaced. 

Green compliance 

Zetex Semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding regulatory 
requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to reduce the use of 
hazardous substances and/or emissions.   
All Zetex components are compliant with the RoHS directive, and through this it is supporting its customers in their compliance with WEEE and ELV 
directives. 

Product status key:   

“Preview” 

Future device intended for production at some point. Samples may be available 

“Active” 

Product status recommended for new designs 

“Last time buy (LTB)” 

Device will be discontinued and last time buy period and delivery is in effect 

“Not recommended for new designs”  Device is still in production to support existing designs and production 
“Obsolete” 

Production has been discontinued 

Datasheet status key:  

“Draft version” 

This term denotes a very early datasheet version and contains highly provisional  
information, which may change in any manner without notice. 

“Provisional version” 

This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance. However, 
changes to the test conditions and specifications may occur, at any time and without notice. 

“Issue” 

This term denotes an issued datasheet containing finalized specifications. However, changes to specifications 
may occur, at any time and without notice. 

Europe  

Zetex GmbH 
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D-81541 München 
Germany 
Telefon: (49) 89 45 49 49 0 
Fax: (49) 89 45 49 49 49 
[email protected] 

Americas 

Zetex Inc 
700 Veterans Memorial Highway 
Hauppauge, NY 11788 
USA 
 
Telephone: (1) 631 360 2222 
Fax: (1) 631 360 8222 
[email protected] 

Asia Pacific 

Zetex (Asia Ltd) 
3701-04 Metroplaza Tower 1 
Hing Fong Road, Kwai Fong 
Hong Kong 
 
Telephone: (852) 26100 611 
Fax: (852) 24250 494 
[email protected] 

Corporate Headquarters 

Zetex Semiconductors plc 
Zetex Technology Park, Chadderton 
Oldham, OL9 9LL 
United Kingdom 
 
Telephone (44) 161 622 4444 
Fax: (44) 161 622 4446 
[email protected] 

 
 

 

Summary of Contents for ZXLD1350EV

Page 1: ... 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 b...

Page 2: ...Power LED driving Low voltage halogen replacement LEDs Automotive lighting Illuminated signs ZXLD1350 Device Packages Pin and Definitions TSOT23 5 pack ZXLD1350 Device Pin Definition Name Pin No Description LX 1 Drain of NDMOS switch GND 2 Ground 0V ADJ 3 Internal voltage ref pin 1 25V Leave floating for normal operation Connect to GND to turn off output current Drive with DC voltage 0 3V to 1 25V...

Page 3: ... be nominally 0 5ms without capacitor C3 Adding C3 will increase the soft start time by approximately 0 5ms nF For other reference designs or further applications information please refer to the ZXLD1350 datasheet Schematic Diagram Figure 2 shows the schematic for the ZXLD1350EV4 evaluation board Figure 2 Schematic for the evaluation board ZXLD1350EV4 ZXLD1350 Operation In normal operation when vo...

Page 4: ...50E5TA Zetex DC DC converter D1 D2 D3 LED LWW5SG GYHY 5K8L Osram Power LED JP1 JP2 JP3 Jumper Various 2 54mm pitch jumper pin strips VIN GND ADJ LED a LED k Test loop 100 108 Hughes ZXLD1350EV4 LAYOUT The top and bottom view of the evaluation board is shown here The slugs of the 1 watt LEDs are connected to isolated copper floods both on the top and bottom layers with thermal inter connection betw...

Page 5: ...1 and JP3 disconnected jumper off all three LEDs should illuminate and will be regulated nominally at 300mA 5 To change the number of LEDs connected in series use jumper JP1 and JP3 to bypass LEDs D1 and D3 respectively Warning The LEDs may be hot OTHER FEATURES Dimming The ZXLD1350 provides three dimming options DC high frequency PWM and low frequency PWM dimming DC Voltage Dimming 1 Switch off t...

Page 6: ...ake sure C3 is not fitted 4 Connect a PWM signal to the ADJ pin via an open collector NPN transistor or an open drain N channel MOSFET 5 Alternatively drive the ADJ pin directly with a PWM signal However make sure the PWM signal voltage levels do not violate the ADJ pin voltage rating Driving the ADJ pin above 1 25V will exceed the maximum set current for the value of Rs and may damage the device ...

Page 7: ...ltage drop For an external load other than LEDs the positive terminal of the load should be connected to test pin LED a and the negative terminal of the load should be connected to test pin LED k 3 Follow the ZXLD1350EV4 Power Up sequence PERFORMANCE The system efficiency depends on the sense resistor supply voltage switching inductor and the number of 1W LEDs connected in series The graph below s...

Page 8: ...acturer To ensure quality of service and products we strongly advise the purchase of parts directly from Zetex Semiconductors or one of our regionally authorized distributors For a complete listing of authorized distributors please visit www zetex com salesnetwork Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales c...

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