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STK672-432B-E Datasheet(PDF) 6 Page - Sanyo Semicon Device |
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STK672-432B-E Datasheet(HTML) 6 Page - Sanyo Semicon Device |
6 / 26 page STK672-432B-E No.A1733-6/24 Precautions [GND wiring] • To reduce noise on the 5V/24V system, be sure to place the GND of C01 in the circuit given above as close as possible to Pin 2 and Pin 6 of the hybrid IC. In addition, in order to set the current accurately, the GND side of RO2 of Vref must be connected to the shared ground terminal used by the Pin 18 (S.G) GND, P.G1 and P.G2. [Input pins] • If VDD is being applied, use care that each input pin does not apply a negative voltage less than -0.3V to S.GND, Pin 18. Measures must also be taken so that a voltage equal to or greater than VDD is not input. • High voltage input other than VDD, MOI, FAULT1, and FAULT2 is 2.5V. • Pull-up resistors are not connected to input pins. Pull-down resistors are attached. When controlling the input to the hybrid IC with the open collector type, be sure to connect a pull-up resistor (1 to 20k Ω). Be sure to use a device (0.8V or less, low level, when IOL=5mA) for the open collector driver at this time that has an output voltage specification such that voltage is pulled to less than 0.8V at low level. • When using the power on reset function built into the hybrid IC, be sure to directly connect Pin 14 to VDD. • We recommend attaching a 1,000pF capacitor to each input to prevent malfunction during high-impedance input. Be sure to connect the capacitor near the hybrid IC, between Pin 18 (S, G). When input is fixed low, directly connect to Pin 18. When input is fixed high, directly connect to VDD. [Current setting Vref] If the motor current is temporarily reduced, the circuit given below is recommended. The variable voltage range of Vref input is 0.14 to 1.48V. [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: 0.152 Ω (Current detection resistor inside the hybrid IC) 5V RO1 RO2 R3 5V RO1 RO2 R3 Vref Vref |
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