Datasheet TPD4162F (Toshiba) - 6

TPD4162F 7.3. Description of Protection Function
(1) Current limit protection The IC incorporates a current limit protection circuit to protect itself against over current at startup or when a motor is locked. This protection function detects voltage generated in the current-detection resistor connected to the RS pin. When this voltage exceeds VR = 0.5 V (typ.), the high-side IGBT output, which is on, temporarily shuts down after a delay time, preventing any additional current from flowing to the IC. The next PWM ON signal releases the shutdown state. Duty ON PWM reference voltage Duty OFF Triangle wave Delay time toff ton ton Current limit setting value Output current Retry Over-current shutdown
Figure7.3.1 Description of Current limit protection
(2) Over-current protection This protection function detects voltage generated in the current-detection resistor connected to the RS pin. When this voltage exceeds VR = 0.7 V (typ.), the all high-side and low-side IGBT outputs are shut down. Over-current protection recovery time can be adjusted with the capacitor and resistance connected to CS terminal. The CS terminal voltage is carried out by the damping time constant decided by this capacitor and resistance. The low side IGBT of the phase which a high side turns on by a timing chart will be made to turn on, a bootstrap capacitor will be charged, if the threshold value 1(VRON) is exceeded (refreshment operation), and the threshold value 2(VROFF) is exceeded after that, IGBT turns on according to an input signal. CS terminal Voltage Threshold value 2(VROFF) Threshold value 1(VRON) Refreshment operation tcs tcsr Over-current setting value Output current Over-current shutdown Retry
Figure7.3.2 Description of Over-current protection
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