Hi, I'm trying to make LED driver.
My LED is 3W 700mA max
**broken link removed**
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:
https://www.electro-tech-online.com/custompdfs/2010/10/ZXSC300.pdf
I tried to use ZXSC300 Feed Forward calculator here:
**broken link removed**
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
My LED is 3W 700mA max
**broken link removed**
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:
https://www.electro-tech-online.com/custompdfs/2010/10/ZXSC300.pdf
I tried to use ZXSC300 Feed Forward calculator here:
**broken link removed**
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