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THMC40DR Datasheet(PDF) 7 Page - Texas Instruments |
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THMC40DR Datasheet(HTML) 7 Page - Texas Instruments |
7 / 19 page THMC40, THMC41 VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS SLIS097 – MARCH 2000 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Hall sensor comparator and signal conditioning inputs (H+, H–) Referring to Figure 1, the THMC40 and THMC41 have an internal Hall sensor comparator allowing the use of low-cost naked Hall sense elements. The Hall signal conditioning block receives a low-level differential voltage from the naked Hall position sensor element. The comparator then implements a zero differential voltage crossing detection with a deglitch time of 25 µs (typical) to reject noise on the Hall signal inputs. Referring to Figure 2, the PHx drive that was on (low) turns off after the 25- µs deglitch time is reached. Then the opposite PHx drive turns on after another delay time. This 5- µs (typical) dead time is implemented to prevent both phases from conducting simultaneously and to allow time for the inductive energy to be snubbed from the phase that was just turned off. The Hall comparator circuit has an input offset voltage (VIO) which is not greater than ±7 mV. The common-mode input voltage range is 1 V to 3.5 V (see Figure 2). tDEAD(PHx) VCM PHA Output Voltage PHB Output Voltage OFF ON OFF ON VIO 5 µs tHALL 25 µs tDEAD(PHx) tHALL 25 µs 5 µs Time TACH Output Voltage (THMC40) OFF ON Hall Sensor Waveform (VH+ - VH–) Figure 2. Hall Sensor Signal Conditioning Waveforms Table 1 shows PHA and PHB commutation, and TACH output (THMC40) functionality: Table 1. PHA and PHB Low-Side Drive Commutation and TACH Functionality H+ H– PHA PHB TACH (THMC40) + – High (OFF) Low (ON) High (OFF) – + Low (ON) High (OFF) Low (ON) |
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