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STD 19V+5V to 12V PWM Fan Adapter
License: Public Domain
Mode: Editors' pick
This is an adapter board for using a standard 4-pin 12V PWM fan instead of a 5V one, when there is a nominal 19V (15V - 25V) power available. It must share the ground with the host fan connector ground, or Bad Things Will Happen.
When R1 (11.3 kOhm, marked as 11k3* on the board) is not used, the host PWM is pulled to 3.3V. When it is used, the host PWM is pulled to 5V.
To omit host PWM pull-up altogether, do not use any of the three resistors (3k83, 10k, and 11k3*) closest to the host 4-pin connector.
Board is 38.1mm × 25.4mm (1.5"×1") with all components on topside. There are four 2.5mm (0.098") mounting holes with a 5.5mm (0.216") diameter strengthening ring, their centers 3.048mm from the nearest edges. The hole centers form a 32.0mm×19.3mm or 1.26"×0.76" rectangle.
The components are sourced from Mouser, and Mouser part numbers are included. While the resistors in the BOM are all 0603 packages, you can instead use 0805 resistors: the pads are suitable for both package sizes. Similarly, the inductor footprint suits both 5×5mm (VLS5045EX-101M) and 6×6mm (VLS6045EX-101M) inductors.
Here are the top and bottom sides of the board:
And here are a couple of 3D renders of the board:
ID | Name | Designator | Footprint | Quantity | BOM_Supplier Part | BOM_Supplier | BOM_Manufacturer Part | BOM_Manufacturer |
---|---|---|---|---|---|---|---|---|
1 | 10u | C1,C2 | C1206 | 2 | 187-CL31B106KBHNNNE | Mouser | CL31B106KBHNNNE | Samsung Electro-Mechanics |
2 | 1n | C3 | C0805 | 1 | 187-CL21C102JCFNNNE | Mouser | CL21C102JCFNNNE | Samsung Electro-Mechanics |
3 | 19VIN | CN1 | CONN-TH_22272021 | 1 | 538-22-27-2021 | Mouser | 22-27-2021 | Molex |
4 | 47053-1000 | CN2,CN3 | CONN-TH_47053-1000 | 2 | 538-47053-1000 | Mouser | 47053-1000 | MOLEX |
5 | PMEG3010ER,115 | D1 | SOD-123_L2.6-W1.7-LS3.5-RD | 1 | 771-PMEG3010ER115 | Mouser | PMEG3010ER,115 | Nexperia |
6 | 100uH | L1 | IND-5045+6045 | 1 | 810-VLS6045EX-101M | Mouser | VLS6045EX-101M | TDK |
7 | NX138AKR | Q1,Q2,Q3,Q4 | TO-236AB_L2.9-W1.3-P0.95-LS2.3-BR | 4 | 771-NX138AKR | Mouser | NX138AKR | Nexperia |
8 | 11.3k | R1 | 0603+0805 | 1 | 603-AC0603FR-0711K3L | Mouser | AC0603FR-0711K3L | YAGEO |
9 | 3.83k | R2 | 0603+0805 | 1 | 603-RC0603FR-073K83L | Mouser | RC0603FR-073K83L | YAGEO |
10 | 10k | R3,R4,R5,R6 | 0603+0805 | 4 | 603-RC0603FR-0710KL | Mouser | RC0603FR-0710KL | YAGEO |
11 | 100Ω | R7,R8 | 0603+0805 | 2 | 603-AC0603FR-13100RL | Mouser | AC0603FR-13100RL | YAGEO |
12 | R-78K12-0.5 | U1 | SIP-3P_L12.0-W8.0-P2.54-BL | 1 | 919-R-78K12-0.5 | Mouser | R-78K12-0.5 | RECOM Power |
13 | ITS4100S-SJ-N | U2 | PG-DSO-8_L5.0-W4.0-P1.27-LS6.0-BL | 1 | 726-ITS4100SSJNXUMA1 | Mouser | ITS4100S-SJ-N | Infineon |
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