1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

ZXSC300 0.8v-4.5V 700mA 3W LED Driver

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by smilem, Oct 13, 2010.

  1. smilem

    smilem Member

    Joined:
    Feb 3, 2009
    Messages:
    147
    Likes:
    0
    Hi, I'm trying to make LED driver.

    My LED is 3W 700mA max
    AVAGO TECHNOLOGIES|ASMT-JW32-NVV01|LED, 3W, COOL-WHITE, MINIMUM 100LM | Farnell LT

    Power source is 1.5V batteries x3 = 4.5Volts.

    I would like to use ZXSC300 because it works up to 0.8V and I don't want to waste any power from my batteries :)

    Here is datasheet for ZXCS300:
    http://www.electro-tech-online.com/custompdfs/2010/10/ZXSC300.pdf

    I tried to use ZXSC300 Feed Forward calculator here:
    http://www.diodes.com/_files/calculators/ZXSC300_Calculator.xls

    However I'm unsure about some values so I attach my screen shot.
    Please help to calculate and select parts for my project.

    Here is a list I made for screenshot calculation:
    U1 ZXSC300 | SOT23-5 Elfa 73-298-35
    Q1 FMMT617 transistor NPN 15 V | SOT23 Elfa 71-029-33
    D1 Schottky diode DO-214AA 1A 15V SMB Elfa 70-217-02
    R Sense Resistor SMD up to 20 W 12 mΩ 0.5 W ±1 % Elfa 60-314-39
    R1 WELWYN - PCF0805R-17K4BT1 - RESISTOR, 0805, 17K4 Farnell 1353223
    Offset resistor Resistor 97,6ohm 1% 0,6W Elfa 60-711-38
    RT NTC resistor SMD 0603 4.7 kΩ Elfa 60-304-56
    L WUERTH ELEKTRONIK CHOKE, 1045 SIZE, 1.1UH Farnell 1800264
    C1 KEMET CAPACITOR, 0603, 2.2UF, X5R Farnell 1108322
     

    Attached Files:

  2. smilem

    smilem Member

    Joined:
    Feb 3, 2009
    Messages:
    147
    Likes:
    0
    Nobody used this driver? Any comments, anyone ?
     

Share This Page