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Changes for page Power controller

Last modified by Mathias Larsen on 2026/09/24 21:21
From version 39.1
edited by Mathias Larsen
on 2026/09/24 21:21
Change comment: There is no comment for this version
To version 38.1
edited by Mathias Larsen
on 2026/09/23 18:47
Change comment: There is no comment for this version

Summary

Details

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Content
... ... @@ -117,6 +117,15 @@
117 117  
118 118  [[image:1790100104451-169.png]]
119 119  
120 +|=Component|=Value|=Ref Des (circuit 1)
121 +|Fuse holder|Littelfuse nano|F101
122 +|Shunt resistor|2 mΩ, 1 %, 5 W, 2512|R101
123 +|Filter resistor|10 kΩ|R102
124 +|Filter capacitor|10 nF|C101
125 +|Green LED resistor|4.7 kΩ, 0805|R103
126 +|Red LED resistor|350 Ω|R104
127 +|RGB LED|Würth 150282M167310|D101
128 +
120 120  === Green LED ===
121 121  
122 122  The green LED indicates whether the fuse is intact. It is connected from the output side of the fuse to ground through a 4.7 kΩ resistor. When the fuse is intact, the LED lights up. If the fuse blows, the LED loses its supply and turns off. This makes it easy to find a blown fuse by looking at the board.
... ... @@ -181,6 +181,13 @@
181 181  
182 182  The 12 V supply is a synchronous buck converter that steps the 24 V supply down to 12 V for the pumps, inverter and data logger. It is built around an LM5148 buck controller (U801) from Texas Instruments, which drives two external N-channel power MOSFETs (IAUCN04S7L028, Q901 and Q902) as the high-side and low-side switches. The output inductor is a 0.65 µH Coilcraft XAL7070 (L901), and a 3 mΩ resistor (R910) is used for current sensing in the controller.
183 183  
193 +|=Component|=Part|=Ref Des
194 +|Buck controller|LM5148RGYR|U801
195 +|Power MOSFETs|IAUCN04S7L028ATMA1|Q901, Q902
196 +|Inductor|XAL7070-651MEB, 0.65 µH|L901
197 +|Current sense resistor|3 mΩ, 3 W|R910
198 +|Output capacitors|22 µF, 25 V|C909–C912
199 +
184 184  The buck converter overheated under load and made a whining sound.
185 185  
186 186  [[image:1790102044737-969.png||height="368" width="925"]]
... ... @@ -228,6 +228,14 @@
228 228  
229 229  [[image:1790181075885-591.png||height="343" width="367"]]
230 230  
247 +|=Function|=Buzzer / brake light
248 +|Supply|24 V
249 +|N-channel MOSFET|BSS123NH6327XTSA1 (Q803, Q804)
250 +|P-channel MOSFET|BSS83PH6327XTSA1 (Q801, Q802)
251 +|Gate resistor|1 kΩ (R807, R808)
252 +|Pull-down / pull-up / divider|10 kΩ (R805, R806, R809–R812)
253 +|Maximum output current|330 mA
254 +
231 231  ==== Pump ====
232 232  
233 233  The N-channel MOSFET (BSS123NH6327XTSA1) is the same as for the buzzer and brake light, but the P-channel MOSFET (BSC084P03NS3GATMA1) has a much higher current rating.
... ... @@ -236,6 +236,14 @@
236 236  
237 237  [[image:1790181054296-268.png||height="306" width="371"]]
238 238  
263 +|=Function|=Pump 1 / Pump 2
264 +|Supply|12 V
265 +|N-channel MOSFET|BSS123NH6327XTSA1 (Q905, Q906)
266 +|P-channel MOSFET|BSC084P03NS3GATMA1 (Q903, Q904)
267 +|Gate resistor|1 kΩ (R913, R914)
268 +|Pull-down / pull-up|10 kΩ (R911, R912, R915, R916)
269 +|Maximum output current|5 A
270 +
239 239  == Known issues ==
240 240  
241 241  * The 12 V supply did not work.