Description
SK120 120W 6A Automatic Buck-Boost Converter
The SK120 is an adjustable 120 W buck-boost converter with constant-voltage/constant-current (CC/CV) control. It operates in buck or boost mode across a wide 6–36 V DC range. Its full-view color VA display, encoder, and button controls provide precise adjustment, with 10 user memories and multiple protection functions.
🔧 Technical specifications
- Input voltage: 6.0–36.0 V DC
- Output voltage: adjustable 0.0–36.0 V DC
- Output current: 0–6.000 A (adjustable OCP protection 0–6.2 A; default 6.2 A)
- Maximum power: 120 W
- Modes: CV (constant voltage), CC (constant current), CW (constant power)
- Display: full-view color VA display (simultaneous V, A, and W readings)
- Memories: 10 stored V/I pairs
- Built-in protection: reverse polarity, reverse current, undervoltage, overvoltage, overcurrent, overpower, over-temperature, and reverse overvoltage
- Modbus compatibility: TTL serial interface for RS485 control or a Wi-Fi module
- Operating temperature: −20 °C to +60 °C
- Dimensions: 92 × 69 × 13 mm (panel); 135 × 32 × 27 mm (power board)
💡 Typical applications
- Test benches and laboratory power supplies
- CC/CV charging of Li-ion and SLA batteries
- High-power LED control
- DC motor control
- CC/CV solar chargers
- CNC and robotics projects requiring adjustable voltage
🛠️ Pinout / wiring
| Connector | Function |
|---|---|
| IN+ / IN– | 6–36 V DC power input |
| OUT+ / OUT– | Regulated 0–36 V DC output, 0–6 A |
| NTC 10 kΩ | External temperature probe (XH2.54-2P) |
| UART (4 pins) | TTL serial for Modbus RTU (TX, RX, 5 V, GND) or Wi-Fi module |
| Buttons / encoder | VSET, ISET, SW, and rotary encoder on the front panel |
Setup procedure
- Connect IN+ / IN– to the DC source and OUT+ / OUT– to the load.
- Briefly press VSET to set voltage (CV), turn the encoder, then press again to confirm.
- Press ISET to set current (CC) in the same way.
- SW switches the input/output display; hold it for 2 seconds to open the advanced menu.
- For automatic undervoltage cutoff, set the UVLO potentiometer through Modbus or the internal menu.
Ensure adequate ventilation for the power board when approaching its limits (6 A / 120 W).
