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A3938 Datasheet(PDF) 7 Page - Allegro MicroSystems |
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A3938 Datasheet(HTML) 7 Page - Allegro MicroSystems |
7 / 11 page Three-Phase Power MOSFET Controller A3938 7 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com VBB. Motor power supply connection for the A3938 and for power MOSFETs. It is good practice to connect a decou- pling capacitor from this pin to AGND, as close to the device pins as possible. REF . Analog input to current limit comparator. Voltage applied here sets the peak load current according to the fol- lowing equation: I TRIP = VREF / RSENSE LCAP . 5 V reference to power internal logic and provide low current for DEAD pin and FAULT pin. Connection for 0.1 μF external capacitor for decoupling. DEAD. Analog input. A resistor between DEAD and LCAP is selected to adjust turn-off time to turn-on time. This delay is needed to prevent cross-conduction in the external power MOSFETs. See the section Application Information for details on setting dead time. SENSE. Analog input to the current limit comparator. Voltage representing load current appears on this pin. Voltage transients that are seen at this pin when the drivers turn on are ignored for period of time, t BLANK. AGND. Analog reference ground. PGND. Return for low-side gate drivers. This should be connected to the PCB power ground. H1 H2 H3 DIR GLA GLB GLC GHA GHB GHC SA SB SC 1 0 1 1001100 HI Z LO 1 0 0 1001010 Z HI LO 1 1 0 1100010 LO HI Z 0 1 0 1100001 LO ZHI 0 1 1 1010001 Z LO HI 0 0 1 1010100 HI LO Z 1 0 1 0100001 LO ZHI 1 0 0 0010001 Z LO HI 1 1 0 0010100 HI LO Z 0 1 0 0001100 HI Z LO 0 1 1 0001010 Z HI LO 0 0 1 0100010 LO HI Z Commutation Truth Table MODE PWM RESET Quadrant Mode of Operation** 0* 0 0 Fast decay PWM chop – current decay with opposite of selected low- side drivers ON. 0* 1 0 Fast Decay Selected drivers ON. If current limiting, opposite of selected low-side drivers ON. 1 0 0 Slow decay PWM chop – current decay with both low-side drivers ON. 1 1 0 Slow Decay Selected drivers ON. If current limiting, both low-side drivers ON. XX 1 X All high-side drivers OFF, low-sides see BRKSEL stored. Clears storable faults. * Low-side, only, Synchronous Rectification mode. **See Commutation Truth Table for meaning of “both” and "selected." Input Logic |
Similar Part No. - A3938_16 |
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Similar Description - A3938_16 |
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