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MC3479PG Scheda tecnica(PDF) 5 Page - ON Semiconductor |
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MC3479PG Scheda tecnica(HTML) 5 Page - ON Semiconductor |
5 / 10 page MC3479 http://onsemi.com 5 APPLICATION INFORMATION General The MC3479 integrated circuit is designed to drive a stepper positioning motor in applications such as disk drives and robotics. The outputs can provide up to 350 mA to each of two coils of a two−phase motor. The outputs change state with each low−to−high transition of the clock input, with the new output state depending on the previous state, as well as the input conditions at the logic controls. Outputs The outputs (L1−L4) are high current outputs (see Figure 5), which when connected to a two−phase motor, provide two full−bridge configurations (L3 and L4 are not shown in Figure 5). The polarities applied to the motor coils depend on which transistor (QH or QL) of each output is on, which in turn depends on the inputs and the decoding circuitry. Note: tr, tf (10% to 90%) for input signals are p 10 ns. tPLHA tPHLA th tsu PWCLKL PWCLKH 1.5 V 1.5 V Phase A Output F/HS, CW/CCW Inputs 0 L1 − L4 Outputs tPCD 3.0 V 0 Clk 3.0 V Figure 4. Clock Timing (Refer to Figure 2) 6.0 V 1.5 V Current Drivers and Logic VD QH QL L2 Parasitic Diodes L1 Motor Coil QL VM B/S I ′BS IBS RB To L3, L4 Transistors CW / CCW OIC Clk F/HS Inputs Logic Decoding Circuit Figure 5. Output Stages QH The maximum sink current available at the outputs is a function of the resistor connected between Pin 6 and ground (see section on Bias/Set operation). Whenever the outputs are to be in a high impedance state, both transistors (QH and QL of Figure 5) of each output are off. |
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