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µS-DD4 Darlington Driver Board User Manual

Introduction

The µS-DD4 is designed to allow easy connection of four high current darlington drivers to a µStack system. Each driver is controlled by one of the µStack I/O lines. It is therefore possible to use up to four driver boards in a single stack.

Drivers are rated at 5Amp Peak, 1.5A continuous per channel @ 25 oC.

µS-DD4 Configuration

The µS-DD4 configuration is by jumper selection. A jumper between J3 and J4 selects the µStack I/O line which control each driver. Note that it is important not to attempt to control a single driver with more than one I/O line, therefore great care should be taken to ensure that a single driver is not selected twice. The illustration to the right shows a DD4 board with the driver channels configured for control by µStack I/O lines P12-P15.

 

Operation of Drivers

Each darlington driver is configured as a low side switch, a "freewheel" diode protects the driver from transient voltages encountered when driving inductive loads such as motors, solenoids and relays.

 

µS-DD4 Power to Loads

When driving high power loads, careful consideration should be given to power supply issues. The µS-DD4 allows power to be derived from the µStack for low power requirements, or from an independent connector for higher power requirements. Power should never be supplied via the independent connector if jumpers Jmp1 or Jmp2 are installed.

For low power requirements, Power for loads may be taken from the µStack by installing links Jmp1 & Jmp2, the power input connector is unused.

For loads with higher power requirements Jmp1 & Jmp2 should be removed and power should be supplied from an independent source. Note that in this case the grounds for the µStack & DD4 should be commoned at the PSU.

 

For low power requirements, Power for loads may be taken from the µStack by installing links Jmp1 & Jmp2, the power input connector is unused.

 

For loads with higher power requirements Jmp1 & Jmp2 should be removed and power should be supplied from an independent source.

 

µS-DD4 Applications

 

 

Technical Specification

Channels : 4 NPN Darlington Driver (TIP121)
Output (per ch) : 12-24VDC, 5A Peak 1.5A Cont. @ 25 oC

Ctrl Signal (per ch) : 0-5V DC, 2.5 mA

 

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