The MikroDrive Board is an add-on board that employs a high-voltage, high-current ULN2803AN Darlington transistor array. This array of 8 NPN Darlington transistors allows interfacing between a low-level logic circuitry and multiple peripheral power loads. The ULN2803A IC allows digital outputs capable of providing current of only up to several milliamperes to be connected to devices that require driving current of up to several hundreds of milliamperes. The MikroDrive Board provides power loads up to 260W (350 mA x 8, 95V). The transistors are of.
- Based on the ULN2803A Darlington transistor array with eight outputs
- Jumper to select power source between 5V system VCC or external up to 50V
- Screw terminals for the 8x outputs and for external power supply
- Accepts 7-23V AC (or 9-32V DC) input voltages
- High-voltage outputs: 50 V
- 500-mA-rated collector current
- Output clamp diodes
- Inputs compatible with various types of logic
- Compact design, small footprint
- Mounting holes at the board corners to simplify integration
- Clear silkscreen marking for easy connection
- RoHS compliant
IC/Module: ULN2803A Darlington Transistor Array
The ULN2803A is a high-current 8x Darlington transistor array that is capable of powering loads up to 260W in total. The open-collector output transistors have integral clamp diodes that protect them against high voltage of self-induction.With a collector-current rating of 500 mA, each Darlington pair may be connected in parallel for higher current capability. It features a 2.7-kΩ series base resistor for each Darlington pair for operation directly with TTL or 5-V CMOS devices.
The mikroDrive Board features a Jumper J1 that allows the user to select the power supply source for the ULN2803A's output drivers. When J1 is set in Vcc position, the power comes through the IDC10 connector from the 5V microcontroller host system. When the jumper is set to the Vcc-Ext position, the outputs are powered from an external source up to 50V via screw terminals.
The mikroDrive Board serves as an ideal choice for designs where power source conversion between low-level logic circuitry and multiple peripheral power loads. Typical power loads include relay drivers, hammer drivers, lamp drivers, display drivers (LED and gas discharge), line drivers, and logic buffers.
MikroDrive Board User Manual
- mikroDrive Board (1)