Technobox Part Number 5093
(RoHS Compliant Lead-free)
Micro Mezzanine System™
Electrical Conversion Module (ECM)
Analog to Digital Converter - 2-channel power H bridge, 1 amp drive
ECM P/N 5093 provides 2 independent full bridge circuits. The
two full bridge circuits can be used together to drive one small two phase
stepper motor. Each full bridge circuit can drive one small dc motor or other
bipolar load. Note all inductive loads should employ transient protection.
Each full bridge can be used as two high side switching half bridges with a
single high side voltage. In this application one side of the load should be
tied to GND. The positive high side voltage is supplied by the user on the input
pins up to +30V.
The board switches up to 4 loads to GND. In this application the high side
voltages are connected to the loads and are independent of each other, but must
be less than +30V. The half and full bridges can be wired in parallel to get
greater current capacity.
Negative voltages cannot be used as the high side voltage, as they will short
out to GND via the body diode of the MOSFET. On resistance of the MOSFET is
0.010 ohms maximum. Voltages of +3V, +5V, +12V and -12V fused at 0.75 Amps are
provided on the I/O pins. A serial identification circuit prevents use with
incorrect FPGA IP.
In the example the top full bridge circuit drives a small DC
brush motor clockwise or counter clockwise. The bottom full bridge circuit is
used as two half bridge circuits in parallel to double the current rating for a
load switched to ground. The trade off here is that while doubling the current
capacity only one load can be switched. Since the circuit can only switch to
ground in this configuration the motor rotation is uni-directional. Other
applications include pulse generation, electronic load testing and arbitrary
logic level generation. P/N 5093 is also useful as a fused low amperage power
supply for external circuitry.
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