Figure 12-15 is a timing chart that represents operationwaveforms during OCP operation. When the OCP pinvoltage increases to the OCP Threshold Voltage(VTRIP = 1.0 V) or more, and remains in this condition fora period of the OCP Blanking Time (tBK =2 μs) or longer,the OCP circuit is activated. The enabled OCP circuitshuts off the low-side transistors and puts the FO pin intoa low state. Then, output current decreases as a result ofthe output transistor turn-offs. Even if the OCP pinvoltage falls below VTRIP, the IC holds the FO pin in thelow state for a fixed OCP hold time, tP = 25 μs (typ.). Then,the output transistors operate according to input signals.The OCP is used for detecting abnormal conditions,such as an output transistor shorted. In case short-circuitconditions occur repeatedly, the output transistors can bedestroyed. For this reason, motor operations must becontrolled by the external microcontroller so that it canimmediately stop the motor when fault signals aredetected.
Figure 12-15 is a timing chart that represents operation<br>waveforms during OCP operation. When the OCP pin<br>voltage increases to the OCP Threshold Voltage<br>(VTRIP = 1.0 V) or more, and remains in this condition for<br>a period of the OCP Blanking Time (tBK =2 μs) or longer,<br>the OCP circuit is activated. The enabled OCP circuit<br>shuts off the low-side transistors and puts the FO pin into<br>a low state. Then, output current decreases as a result of<br>the output transistor turn-offs. Even if the OCP pin<br>voltage falls below VTRIP, the IC holds the FO pin in the<br>low state for a fixed OCP hold time, tP = 25 μs (typ.). Then,<br>the output transistors operate according to input signals.<br>The OCP is used for detecting abnormal conditions,<br>such as an output transistor shorted. In case short-circuit<br>conditions occur repeatedly, the output transistors can be<br>destroyed. For this reason, motor operations must be<br>controlled by the external microcontroller so that it can<br>immediately stop the motor when fault signals are<br>detected. ...
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