Project Owners: Mostafa Hussein Rayyan Mahmood
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Component Selection
Buck:
| View file | ||
|---|---|---|
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Part Number | Price | Comments |
|---|---|---|
$1.0309 | Buck IC | |
RC0805FRRC0603FR-0716KL | $0.15 | R7(16kΩ) - Lower resistor in Feedback voltage divider |
RC0805FRRC0603FR-0749K9L | $0.15 | R6(49.9KΩ) - Upper resistor in Feedback voltage divider |
GCD21BR71H333KA01LGCM188R71H333KA55D | $0.2737 | Css (Soft-start Cap) - 33nF |
GCD21BR71H104KA01LGCM188R71H104KA57J | $0.33 26 (x2) | CBST & Filtering Cap (0.1uF - 50V) |
GRM21BR61H106KE43LGCM32EC71H106KA03K | $0$1.48 22 (x8x2) | Cin(10µF) x 8 2 (since it is around 16.3µF 1µF at 25.3 Volts due to DC Bias) - Ceramic Cap , 50V (size 1210) |
RC0805FRRC0603FR-1320KL0720KL | $0.15 | R2 (20 KΩ) UVLO |
RC0805FRRC0603FR-07280KL | $0.15 | R2 R1 (280 KΩ) UVLO |
IHLP3232DZER4R7M11SRP3212A-3R3M | $2$0.1041 | L1 (43.7uH 3uH - 8A3.1A) |
GRM21BR61A476ME15K | $0.91 (x2) | Cout (47UF - 10V) x 2 |
Buck Selection:
Re-evaluating the decision of going with the MAX5033DASA+ chip for the buck converter, mainly to reduce form factor while maintaining high efficiency.
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Given the current issues with the MAX5033 and evaluating it against other (similar) buck converter chips, it is evident that despite the advantage of already having the MAX5033, other bucks convert chips can satisfy the proposed requirements for the 6S ESC project while minimizing the buck converter circuit’s footprint on the PCB. Moreover, given the results from the Decision Matrix, the recommendation for the new buck chip is the TPS62932.
Plots used for buck selection:
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MCU:
Part Number | Price | Comments |
|---|---|---|
STM32L412KBT6 | Already orderd && in the bay | same mcu as 4s esc with same passives |
Current Sense:
| View file | ||
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Part Number | Price | Comments | |
|---|---|---|---|
Already orderd && in the bay | same current sense IC as 4s esc | ||
BVT-M-R001-1.0 | $2.30D1CSA2512MR001F-T3 | $1.51 | 1mOhms, 6W shunt resistor |
CL10B104KB8NNNC | $0.15 (x2) | Bypass Cap and filter caps, 0.1uF x2 | |
RC0603FRRC0603JR-0710KL07160RL | $0.1615 | Filter resistor, 10kOhms160 Ohms, 1/10W |
Gate Driver:
| View file | ||
|---|---|---|
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Part Number | Price | Comments |
|---|---|---|
DRV8328BRUYR | already ordered | same gate driver as 4s esc |
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Gate Driver Pins Connecting to MCU Pins (GPIO Connections):
Pins 18-20 (INHC, INHB, INHA): Control output of high-side FETs
Pins 21-23(INLC, INLB, INLA): Control output of low-side FETs
Pin 24 (nFAULT): Fault indicator output
Pin 25 (nSLEEP): When pulled LOW, device will go to low-power sleep mode.
MOSFET:
Calculations for decision matrix:
| View file | ||
|---|---|---|
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Part Number | Price | Vds | Rds on (max) | Continuous Current |
|---|
Gate Charge (nC) | Rise time | Fall time | Max Operating Temperature | Switching Transition Loss | Switching Loss | Conduction Loss | Temperature Rise By… [Base 25°C] | Comments |
|---|
5. |
77 |
40V |
0. |
45mOhm @ |
50A, 10V | 60A |
6
13
12ns
2ns
MY SELECTION
0.96
30V
8mOhm @ 16A, 10V
55A
7.5
12.5ns
8.2ns
Wider package size
1.02
30V
7mOhm @ 30A, 10V
60A
23.5
30ns
129 nC @ 10 V | 6ns | 14ns | 175°C | 4W | 0.722W | 1.125W | 204.36°C | ||||||
5.36 | 40V | 0.55mOhm @ 100A, 10V | 62A | 170 nC @ 10 V | 13ns | 26ns | 175°C | 7.8W | N/A [datasheet missing Coss] | 1.375W | 142.76°C | ||
2.25 | 30V | 0.47mOhm @ 20A, 10V | 85.9A | 180 nC @ 10 V | 11ns | 11ns | 150°C | 3.3W | 0.369W | 1.175W | 89.89°C | ||
4.71 | 40V | 0.44mOhm @ 88A, 10V | 175A | 169 nC @ 10 V | 12ns | 24ns | 175°C | 1.1W | 0.687W | 4.536W | 168.66°C | ||
4.06 | 30V | 0.57mOhm @ 20A, 10V | 87A | 230 nC @ 10 V | 10ns | 15ns | 150°C | 1.375W | 0.7347W | 3.15W | 94.67°C |
MY SELECTION: SIR500DP-T1-RE3
Primarily for generally lower power losses and lower temperature rise.
Conduction Loss:
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Gate Charge Loss:
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