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L6258EP Datasheet(PDF) 14 Page - STMicroelectronics |
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L6258EP Datasheet(HTML) 14 Page - STMicroelectronics |
14 / 32 page Functional description L6258EP 14/32 2.6 Current control loop The current control loop is a transconductance amplifier working in PWM mode. The motor current is a function of the programmed DAC voltage. To keep under control the output current, the current control modulates the duty cycle of the two outputs OUT_A and OUT_B, and a sensing resistor Rs is connected in series with the motor winding in order to produce a voltage feedback compared with the programmed voltage of the DAC. The duty cycle modulation of the two outputs is generated comparing the voltage at the outputs of the error amplifier, with the two triangular wave references. In order to drive the output bridge with the duty cycle modulation explained before, the signals driving each output (OUTA & OUTB) are generated by the use of the two comparators having as reference two triangular wave signals Tri_0 and Tri_180 of the same amplitude, the same average value (in our case Vr), but with a 180° of phase shift each other. The two triangular wave references are respectively applied to the inverting input of the first comparator and to the non inverting input of the second comparator. The other two inputs of the comparators are connected together to the error amplifier output voltage resulting by the difference between the programmed DAC. The reset of the comparison between the mentioned signals is shown in Figure 5. Figure 5. Output comparator waveforms In the case of VDAC equal to zero, the transconductance loop is balanced at the value of Vr, so the outputs of the two comparators are signals having the same phase and 50% of duty cycle. As we have already mentioned, in this situation, the two outputs OUT_A and OUT_B are simultaneously driven from Vs to ground; and the differential voltage across the load in this case is zero and no current flows in the motor winding. Tri_0 Tri_180 Error Ampl. Output First Comp. Output Second Comp. Output |
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