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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