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BA6970 Datasheet(PDF) 7 Page - Rohm |
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BA6970 Datasheet(HTML) 7 Page - Rohm |
7 / 9 page 600 Motor driver ICs BA6970FS (3) Output waveforms are shown in Fig. 9. Because of the amplifier offset, the output is left OPEN when the out- put signal switches from positive to negative. The output waveform is determined by the external circuit because the IC impedance increases during this transition period. Since inductive loads are usually provided, a capacitor should be connected to suppress backlash voltages. FOperation notes (1) ECV input (pin 22) The ECV input is plotted against the output current in Fig. 10. (2) Hall input Hall input signals of 50mV (peak to peak) or greater should be applied between pins 9 and 10 and between pins 11 and 12. The DC input range is 2V to (Vreg *1.5V). There will be no problem if the input is cen- tered around Vreg / 2. Because the Hall input impedance is 1M Ω or grater, any type of Hall device can be connected. No current flows when the transistor is off because pins 9 and 10 as well as pins 11 and 12 are differential inputs. Because the IC is a linear driver, any DC offset in the Hall device will be amplified and appear in the output. Use Hall devices having a minimum offset. Hall devices can be connected in either series or parallel. Fig.9 Fig.10 Fig.11 |
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