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DRV2605LDGSR Datasheet(PDF) 9 Page - Texas Instruments |
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DRV2605LDGSR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 69 page  OUT+ OUT± 100 k 100 k Ch1 ± Ch2 (Differential) Oscilloscope Ch1 Ch2 M LRA or ERM 470 pF 470 pF DRV2605L www.ti.com SLOS854C – MAY 2014 – REVISED SEPTEMBER 2014 7 Parameter Measurement Information 7.1 Test Setup for Graphs To capture the graphs displayed in the Typical Characteristics section, the following first-order RC-filter setup was used with the exception of the waveform in Figure 9 which was captured without any output filter. This filter is recommended when viewing output signals on an oscilloscope because output PWM modulation is present in all modes. Ensure that effective impedance of the filter is not too low because the closed-loop and auto resonance-tracking features may be affected. Therefore, TI recommends that this exact filter be used for output measurement. Most oscilloscopes have an input impedance of 1 M Ω on each channel and therefore have an approximately 1% loss in measured amplitude because of the voltage-divider effect with the filter. Figure 11. Test Setup 7.1.1 Default Test Conditions • VDD = 3.6 V, unless otherwise noted. • Real actuators (as opposed to modeled actuators) were used as loads for both ERM and LRA modes with exception of the Supply Voltage vs Supply Current (Full Vibration) waveform in Figure 10, which used passive RL (resistance in series with an inductance) loads for test repeatability. Real actuators vary widely in supply currents because of variation in back-EMF voltages. Because real actuators have back EMF, the real supply current is generally less than what is shown in the waveform because of the reduction in the apparent load impedance. Therefore, the curve shows the worst-case current. • All ERM library waveforms were taken with Library A in open-loop mode • All LRA library waveforms were taken with the LRA Library in closed-loop mode • All traces are 2 V/div except for the accelerometer traces • All accelerometer traces are 0.87 g/div except for the LRA Click with and without Braking (PWM) curve in Figure 8, which is 1.74 g/div. Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: DRV2605L |
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