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PWM Step Up Converter

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PWM Step Up Converter
A step-up or boost converter circuit converts a low voltage into a higher value output voltage. With an input voltage in the range from 8 to 16 V this circuit produces an adjustable output voltage up to 42 V at approximately 1 A. It can for example be used as a mobile charger for up to three series connected 12 V Lead-Acid batteries.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
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R1,R3,R9 = 10kOhm 5% 250mW
R2 = 10Ohm 5% 250mW
R4,R6 = 2.7kOhm 5% 250mW
R5 = 0.22Ohm 5% 1W
R7 = 43kOhm 1% 600mW
R8 = 1.5kOhm 5% 250mW
R10 = 4.7Ohm 5% 250mW
P1,P2 = 10kOhm 20% 0.15W, preset, horizontal
C1,C2,C5,C6,C9 = 100nF 5% 63V, ceramic, 5mm or 7.5mm pitch
C3,C4 = 22pF 5% 50V, 5mm pitch
C7 = 1000µF 20% 25V, radial, (12.5mm, 5mm pitch (Panasonic EEUTP1E102, Avnet/Farnell # 1890543)
C8 = 1000µF 20% 63V, radial, (16mm, 7.5mm pitch (Nichicon UPW1J102MHD, Avnet/Farnell # 2112865)
C10,C11 = 10nF 10% 100V, 5mm pitch, ceramic
L1 = 100µH 5A 20%, radial 25mm, 8mm pitch (Würth Elektronik 7447070, Avnet/Farnell # 2082537)
D1 = MBR3100G
D2 = LED, red, 3mm
D3 = LED, green, 3mm
T1 = IRL540NPbF
IC1 = ATmega8-16PU, programmed, Elektor # 120460-41)
IC2 = 7805
F1 = fuse, 5A, slow, with PCB 20x5 mm holder and cap
JP1,JP2 = 2-pin pinheader, 0.1'' pitch, with jumper
K1-K4 = AMP plug, PCB mount, 0.2''
K5 = 6-pin (2x3) pinheader, 0.1'' pitch
S1 = tactile switch, 6x6 mm, SPST-NO
S2,S3 = pushbutton, SPNO, PCB or chassis mounting *
PC1,PC2,PC3 = solder pin, 1.3mm diam. for S2, S3
Heatsink type FK230SAL1 (Fischer Elektronik)
X1 = 16MHz quartz crystal, HC49/US, 50ppm, Cload 18pF
LCD1 = LCD 2x16 characters (Elektor # 120061-71)
PCB # 120460-1

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