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STK672-732AN-E Datasheet(PDF) 7 Page - ON Semiconductor |
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STK672-732AN-E Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 26 page STK672-732AN-E No.2309-7/26 [Setting the motor current] The motor current, IOH, is set using the Pin 19 voltage, Vref, of the hybrid IC. Equations related to IOH and Vref are given below. Vref (RO2 (RO2+RO1))VDD(5V) ··········································· (1) IOH (Vref 4.9) Rs ······························································· (2) The value of 4.9 in Equation (2) above represents the Vref voltage as divided by a circuit inside the control IC. Rs : 0.141 (Current detection resistor inside the hybrid IC) IOH 0 [Smoke Emission Precuations] If Pin 18 (S.G terminal) is attached to the board without using solder, overcurrent may flow into the MOSFET at VCCON (24V ON), causing the STK672-732AN-E to emit smoke because 5V circuits cannot be controlled. In addition, as long as one of the output Pins, 1, 3, 5, or 7, is open, inductance energy stored in the motor results in electrical stress on the driver, possibly resulting in the emission of smoke. Input Pin Functions Pin Name Pin No. Function Input Conditions When Operating ΦA 13 Phase signal input of 5pin (phase A output). Low active(with a function to prevent simultaneous ON of ΦA and ΦAB ,or ΦB and ΦBB. ΦAB 17 Phase signal input of 7pin (phase AB output). ΦB 12 Phase signal input of 3pin (phase B output). ΦBB 10 Phase signal input of 1pin (phase BB output). RESETB 14 System reset Initial state of A and BB phase excitation in the timing charts is set by switching from low to high. A reset is applied by a low level ENABLE 15 The A, AB, B, and BB outputs are turned off, and after operation is restored by returning the ENABLE pin to the high level, operation continues with the same excitation timing as before the low-level input. The A, AB, B, and BB outputs are turned off by a low-level input. Output Pin Functions Pin Name Pin No. Function Input Conditions When Operating FAULT 16 Monitor pin used when over-current detection or overheat detection function is activated. Low level is output when detected. Note : See the timing chart for the concrete details on circuit operation. |
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