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STK672-220-E 데이터시트(PDF) 5 Page - ON Semiconductor |
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STK672-220-E 데이터시트(HTML) 5 Page - ON Semiconductor |
5 / 10 page STK672-220-E No.7465-5/10 Setting the Motor Current Peak Value (IOH) IOH ≈ Vref ÷ Rs Vref: STK672-220-E pin 12 input voltage Rs: STK672-220-E internal current detection resistor (0.17 Ω ±2%) Model of the Motor Current Flowing into the Driver IC (pins 2, 3, 4, and 5) Vref = (Ro2 ÷ (Ro1 + Ro2)) × VCC2 VCC2 = 5V Current Switching Techniques Due to the input bias current (IIB) specifications, Ro1 must be under 100kΩ. The figures below present sample circuits that temporarily switch the motor current when, for example a held motor stops. We recommend using the circuit structure in the figure at the left to minimize as much as possible the effects of the saturation voltage of the reference voltage switching transistor. Switching Circuit 1 Switching Circuit 2 Input Pin Circuits Input pin Circuit type Pin 6, 7, 8, and 9 Pin 11 Pin 12 IOH 0 5V Ro1 Ro3 Ro2 Vref Ro1 Ro3 Ro2 Vref 5V Vref To one of the comparator CR input GND VCC2 The 5V/GND switch shows how toff time setting operates in the internal block diagram on page 3. When switched to GND, pull-down with an input resistance of 20k Ω is formed. MOSFET gate signal 10k Ω 5 V 10k Ω 5V To XB phase XB phase PWM signal X phase (XB phase) Inhibit 10k Ω 10k Ω GND |
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