GENERAL DESCRIPTION
The HBridge can be PWM controlled by two logic inputs (DINA, DINB). A third Enable (EN) logic input can be used to configure the outputs to high impedance for coasting the motor. The MAX22205 features an accurate optional Current Drive Regulation (CDR), which can be used to limit the start up current of a Brushed DC motor or control the phase current for stepper operation. The bridge output current is sensed by a non-dissipative Integrated Current Sensing (ICS) and it is then compared with the desired threshold current. As soon as the bridge current exceeds the threshold (ITRIP), the device enforces the decay for a fixed OFFtime (tOFF). The non-dissipative ICS eliminates the bulky external power resistors normally required for this function, resulting in a dramatic space and power saving compared with mainstream applications based on the external sense resistor. A current proportional to the internally-sensed motor current is output to the analog pins (ISENA, ISENB) to monitor current.
Analog Devices
