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A4933 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A4933 Datasheet(HTML) 1 Page - Allegro MicroSystems |
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1 / 25 page  Description The A4933 is a 3-phase controller for use with N-channel external power MOSFETs and is specifically designed for automotive applications. A unique charge pump regulator provides full (>10 V) gate drive for battery voltages down to 7 V and allows the A4933 to operate with a reduced gate drive, down to 5.5 V. A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs. An internal charge pump for the high-side drive allows DC (100% duty cycle) operation. Full control over all six power FETs in the 3-phase bridge is provided, allowing motors to be driven with block commutation or sinusoidal excitation. The power FETs are protected from shoot-through by integrated crossover control and resistor- adjustable dead time. Bridge current can be measured using an integrated current sense amplifier. This is an uncommitted differential amplifier with a below-ground common mode range allowing it to be used in low-side current sense applications. Gain and offset are defined by external resistors. 4933-DS Features and Benefits ▪ High current 3-phase gate drive for large N-channel MOSFETs ▪ Pin compatible with Allegro® A4935KJP ▪ Cross-conduction protection with adjustable dead time ▪ Top-off charge pump for 100% PWM ▪ Charge pump for low supply voltage operation ▪ Uncommitted current sense amplifier ▪ 5.5 to 50 V supply voltage range ▪ Compatible with 3.3 V and 5 V logic ▪ Extensive diagnostic outputs ▪ Low-current sleep mode Automotive 3-Phase MOSFET Driver Continued on the next page… Package: 48-pin LQFP with exposed thermal pad (suffix JP) Typical Application Not to scale A4933 VBAT VBAT A4405 Regulator Current Sense 3-Phase BLDC Motor A4933 DSP or Micro- controller Control Diagnostics |
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