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ZXLD1321EV2 

 

 

 
Issue 2 – April 2008 

 

 

 

 

 

 

                  www.zetex.com 

© Zetex Semiconductors plc, 2008 

Layout considerations 
PCB tracks should be kept as short as possible to minimize ground bounce, and the ground pin of the device 
should be soldered directly to the ground plane. It is particularly important to mount the coil and the input/output 
capacitors close to the device to minimize parasitic resistance and inductance, which will degrade efficiency. The 
VIN pin is prone to noise. Input decoupling capacitor C2 should be kept as close as possible between the VIN 
and GND pin. Enough copper should be attached to the GND pin (exposed pad) for heat-sinking purposes. In this 
EV board, the copper area is at the bottom layer, connected to the exposed pad through a few plated through 
holes.  
 
Below is the recommended layout of the ZXLD1321EV2.  
 

 

 

 

 

 

Top Silk 

 

 

Top Copper 

 

 

 

 

 

 

 

 

Bottom Copper 

 

Drill File 

 
 
 
 
 
 
 
 
 

Содержание ZXLD1321EV2

Страница 1: ...provides excellent load and current regulation resulting in very stable LED current over the useful life of the battery and over the full operating temperature range The LED current can be adjusted from 100 down to 10 of the set value by applying a dc voltage to the ADJ pin and down to 1 by applying a PWM signal to the ADJ pin An on chip LED protection circuit also allows output current to be redu...

Страница 2: ...lel to R3 by means of soldering jumper pad JP1 For other reference designs or further applications information please refer to the ZXLD1321 datasheet SCHEMATIC DIAGRAM Materials List Ref Value Package Part Number Manufacturer Contact Details U1 LED Driver DFN14 ZXLD1321DCA Zetex www zetex com D1 Schottky Diode SOT23 6 ZHCS2000 Zetex www zetex com L1 10uH 2A MSS7341 103ML NPIS64D100MTRF 744 777910 ...

Страница 3: ...ZXLD1321EV2 Issue 2 April 2008 www zetex com Zetex Semiconductors plc 2008 3 PERFORMANCE Graphs ...

Страница 4: ...cket respectively 3 Connect VIN and GND to positive and zero volts of PSU supply respectively 4 Turn on PSU 5 The LED should illuminate and be regulated at 700mA 1000mA 5 6 Input current should measure between 0 9A and 1 1A for 700mA board and between 1 4 A and 1 6A for 1A board Caution Please make sure the FLS Emitter board is connected to the EV board before applying of power FLS Emitter board w...

Страница 5: ...tors close to the device to minimize parasitic resistance and inductance which will degrade efficiency The VIN pin is prone to noise Input decoupling capacitor C2 should be kept as close as possible between the VIN and GND pin Enough copper should be attached to the GND pin exposed pad for heat sinking purposes In this EV board the copper area is at the bottom layer connected to the exposed pad th...

Страница 6: ...nsure 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 ...

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