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STD MPPT Battery Charger LT8490
Project Status:
Ongoing
License: GPL 3.0
- 3
Description
This charge controller board based on LT8490 MPPT chip can be modified to vary its charge characteristics. Doing so requires replacing resistors. Hence I needed a documented schematic and existing resisor values - the reason for reverse engineering the board.
Ebay listing for board:
https://www.ebay.com/itm/1PC-400-W-MPPT-Solar-Controller-LT8490-Single-Chip-Intelligent-Control-Battery/312731343470?_trkparms=aid%3D555021%26algo%3DPL.SIMRVI%26ao%3D1%26asc%3D20190711100440%26meid%3Dfa08611f359d4ccfb7df12a7de7f602a%26pid%3D100752%26rk%3D1%26rkt%3D3%26mehot%3Dco%26sd%3D164025628854%26itm%3D312731343470%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplRVIAMLv5WebWithPLRVIOnTopCombiner&_trksid=p2047675.c100752.m1982
Thanks go to Craig Peacock for the work he did: https://www.beyondlogic.org/lt8490-mppt-buck-boost-multi-chemistry-battery-charger/
My schematic is largely based on his with modifications reflecting the actual Ebay pcb and resistor values.
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | R010 | R1,R34,R11,R12 | R2512 | 4 |
| 2 | R005 | R53,R2 | R2512 | 2 |
| 3 | 1m | L1 | L_AXIAL-0.6 | 1 |
| 4 | LED-0805_R | D4 | LED0805_RED | 1 |
| 5 | ??u | L2 | L0805 | 1 |
| 6 | LT8490EUKJ-2-fg | U2 | QFN-64_L11.0-W7.0-P0.50-BL-EP | 1 |
| 7 | LT8490EUKJ-fg | U1 | QFN-64_L11.0-W7.0-P0.50-BL-EP | 1 |
| 8 | 1802 | R51,R8 | R0805 | 2 |
| 9 | 0 | R52,R18 | R0805 | 2 |
| 10 | 9312 | R49 | R0805 | 1 |
| 11 | DNF | R50 | R0805 | 1 |
| 12 | 3k65 | R42,R43 | R0805 | 2 |
| 13 | 750 | R46,R47 | R0805 | 2 |
| 14 | 2743 | R5,R3 | R0805 | 2 |
| 15 | 2102 | R16 | R0805 | 1 |
| 16 | 3011 | R39 | R0805 | 1 |
| 17 | 3242 | R40 | R0805 | 1 |
| 18 | 9762 | R48 | R0805 | 1 |
| 19 | 1152 | R44 | R0805 | 1 |
| 20 | 10kRT | R45 | R0805 | 1 |
| 21 | 8061 | R19 | R0805 | 1 |
| 22 | 1963 | R4 | R0805 | 1 |
| 23 | 1051 | R21 | R0805 | 1 |
| 24 | 4871 | R38 | R0805 | 1 |
| 25 | 3091 | R37 | R0805 | 1 |
| 26 | 1333 | R36 | R0805 | 1 |
| 27 | ?? | R??,R?? | R0805 | 2 |
| 28 | 2003 | R41 | R0805 | 1 |
| 29 | 1R0 | R26,R25,R27,R33,R29,R32 | R0805 | 6 |
| 30 | 100 | R24,R10,R9,R22 | R0805 | 4 |
| 31 | 5362 | R14 | R0805 | 1 |
| 32 | 2322 | R13 | R0805 | 1 |
| 33 | 1243 | R35 | R0805 | 1 |
| 34 | 2612 | R17 | R0805 | 1 |
| 35 | 2R0 | R7 | R0805 | 1 |
| 36 | MB515 | D7,D8 | SMC_L6.9-W5.9-LS7.9-RD | 2 |
| 37 | ES1D | D1,D2 | SMA_L4.4-W2.8-LS5.4-RD | 2 |
| 38 | CCR | D5 | SMA_L4.4-W2.8-LS5.4-RD | 1 |
| 39 | 470u80V | C9,C19 | CAP-D12.5×F5.0 | 2 |
| 40 | 470u80V | C22,C6 | CASE-A_3216 | 2 |
| 41 | ??u | C2,C8,C29,C28,C30,C32,C31,C24,C25,C26,C21,C23 | C1206 | 12 |
| 42 | 10n | C1,C40,C39,C17,C37 | C0805 | 5 |
| 43 | ??n | C??,C14,C12,C11,C10,C4,C5,C20,C3 | C0805 | 9 |
| 44 | ?? | C42,C41 | C0805 | 2 |
| 45 | ??u | C38,C16,C44 | C0805 | 3 |
| 46 | LED-0805_G | D3 | LED0805_GREEN | 1 |
| 47 | Temp | J1 | HDR1X2 | 1 |
| 48 | VINR | J2 | HDR1X2 | 1 |
| 49 | SOLAR | J3 | HDR1X2 | 1 |
| 50 | BAT+ | J4 | HDR1X2 | 1 |
| 51 | AOB266L | Q1,Q2,Q3,Q4,Q7,Q6 | TO-263-2_L10.0-W9.1-P5.08-LS15.2-TL | 6 |
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