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A3933: Three Phase Power MOSFET Controller (PDF)
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A3933
Three Phase Power MOSFET Controller
These parts are obsolete and are no longer in production. Samples are no longer available. For new customers or new applications, contact Allegro Applications at applications@allegromicro.com regarding the use of the A3938 as a replacement.
Features
- Drives External N-Channel FETs
- Intelligent High-Side Gate Drive
- Selectable Coast or Dynamic Brake on Power Down
- Adjustable Dead Time for Cross-Conduction Protection
- Selectable Fast or Slow Current-Decay Modes
- Internal PWM Peak Current Control
- Reset/Coast Input
- 120° Hall Commutation with Internal Pullup
- Internal 5-V Regulator
- Low-Side Synchronous Rectification
- Direction Control
- PWM Speed-Control Input
- Fault-Diagnostic Output
- Under-Voltage Protection
Description
The A3933SEQ is a three-phase MOSFET controller for use with bipolar brushless dc motors. It drives all n-channel external power FETs, allowing system cost savings and minimizing r(DS)on power loss. The high-side drive block is implemented with bootstrap capacitors at each output to provide the floating positive supply for the gate drive. The high-side circuitry also employs a unique "intelligent" FET monitoring circuit that ensures the gate voltages are at the proper levels before turn-on and during the ON cycle. This device is targeted for applications with motor supplies from 12 V to 28 V.
Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. The peak load-current limit is set by the user's selection of an input reference voltage and external sensing resistor. The fixed off-time pulse duration is set by a user-selected external RC timing network.
A power-loss braking circuit brakes the motor on an under-voltage condition. The device is configured to either coast or dynamically brake the motor when this occurs.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A3933SEQ | 32-lead PLCC | No | view data | -20 °C to 85 °C | discontinued; refer to A3938SLD-T. discontinued |
Contact Local Sales Representative or check distributor stock |
|
| A3933SEQTR | 32-lead PLCC | No | view data | -20 °C to 85 °C | discontinued; refer to A3938SLDTR-T. discontinued |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.