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Maximilian Seesslen, 09.12.2025 10:48

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h1. Wiki
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[[Eval]]
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[[RTC-Test]]
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[[Eval-L7987]]
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[[Shopping]]
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Helios is "Mainswitch" and "CANSwitch" combined with some features added:
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* RTC
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* 12V VBUS (optional)
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* 4 PWM channels
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* Avoid reduction of LED count
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h2. Driver board
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* One board has 51,24W with the warm LEDs. With LDB350 in general max. 52,8 Watt.
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* Supply voltage: 9V-36V; Use min. 15V when Enable-MOSFET is used.
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* Absolute maximum Voltage:
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** 36V when LDB350-L is used
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** 48V when Enable-MOSFET is used
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* PWM: 100 ~ 1KHz; 2~10VDC or open circuit
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* Usage of LDB-350/LDB-300: Output 2 ~ 40VDC
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* 5V I2C Bus
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h2. Controller board
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* Supply voltage: 5V-60V (min/max 15V/36V when power is routed to driver board with LDB-350L; min. 12V for VBus 12V)
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* Provides VBus 5V or 12V (optional, can be powered externally)
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* Switch 4 power lines
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** [VBus, Plant lamp, Media, illumination] or [VBus, Plant lamp, 2 x Illumination]; VBus can be on of the illumination supplies
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* Can start via RTC or Button
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* Measure power consumption
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* 4 PWM signals for regulator board(s)
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* External I2C bus for regulator board(s)
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* USB port for configuration
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* 3 CAN connectors to have it somwhere in the middle of the bus + Display or to have 5V+12V bus
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h2. Connectors
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???
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| GND  |_. 1 |_. 2  | 5V   |
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| SCK  |_. 3 |_. 4  | SDA  |
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| PWM1 |_. 5 |_. 6  | PWM2 |
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| PWM3 |_. 7 |_. 8  | PWM4 |
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| En   |_. 9 |_. 10 |    |
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h2. Lamps
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* BXRE-65S1001-C-74; kalt; "#110"; 360mA; 34.4V; 12.4W; 1610lm; 3.08 Euro
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* BXRH-27G1000-B-83; warm; "#?"; 350mA; 36.6V; 12.8W; 1256lm; 1.39 Euro
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h2. Parts
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* MCU: STM32F072CBT6 128kB Flash; 1,85 € / 3,47 €
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* SSRs: CPC1976: "Datasheet":https://www.tme.eu/Document/905abd07f76f05090463070be7486d83/CPC1976.pdf 2A_rms continuous -> 460W; 1,8KW all together; zero cross (CPC1976YX6 is non-zero-cross)
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* Power measurement: INA228AIDGSR; 3.63EUro
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* 12V/5V: L7987
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* 5V I2C: PCA9306DCTR
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* High power: SSR-2528ZD3 kann 25A (6000W); Steuerung via 5V; habe "RA2425-d06":https://www.reichelt.de/de/de/shop/produkt/solid-state-relais_ust_3-32vdc_ulast_24-280v-22691, sollte identisch sein. Pizzaofen hat 1500W
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* Ideal diods: MAX40200 for VDD from VBAT; LM74700 for VBUS with seperate MOSFET
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* LDB-350L: 6.60 Euro
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* LDB-300L: 6.54 Euro
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* SK57750AL; Ø50mm; H:50mm; 5,61Euro
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* COB-Halterung CLL020: 8100/G2; 2,32Euro
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h2. Errata
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* There is only one global 'Enable' signal to the driver boards. Not a big deal, the power supplies can be switched off anyways.
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** Usecase 1: When Controller board shares power supply with Driver boards, it can disable drivers when it only wants to feed VBUS.
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** Usecase 2: When Controller board MCU goes to standby or stop mode and the LED supply is not switched, light will go 100%.