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Update：2007-07-27 Views：11083
A3938
Three Phase Power MOSFET Controller
Sumzi Electronics Co., Ltd
3938.pdf
Features
- Drives Wide Range of N-channel MOSFETs
- Low-Side Synchronous Rectification
- Power MOSFET Protection
- Adjustable Dead-Time for Cross-Conduction Protection
- Selectable coast or dynamic brake on power-down or RESET input
- Fast/Slow Current Decay Modes
- Internal PWM Current Control
- Motor Lead Short-to-Ground Protection
- Internal 5 V Regulator
- Fault Diagnostic Output
- Thermal Shutdown
- Under-Voltage Protection
Description
The A3938 is a three-phase, brushless dc motor controller. The A3938 high-current gate drive capability allows driving of a wide range of power MOSFETs and can support motor supply voltages to 50 V. The A3938 integrates a bootstrapped high-side driver to minimize the external component count required to drive N-channel MOSFET drivers.
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. A user-selected external RC timing network sets the fixed off-time pulse duration. For added flexibility, the PWM input can provide speed/torque control where the internal current control circuit sets a limit on the maximum current.
The A3938 includes a synchronous rectification feature. This shorts out the current path through the power MOSFET reverse body diodes during PWM off-cycle current decay. This can minimize power dissipation in the MOSFETs, eliminate the need for external power clamp diodes, and potentially allow a more economical choice for the MOSFET drivers.
The A3938 provides commutation logic for Hall sensors configured for 120-degree spacing. The Hall input pins are pulled-up to an internally-generated 5 V reference. Power MOSFET protection features include: bootstrap capacitor charging current monitor, regulator undervoltage monitor, motor lead short-to-ground, and thermal shutdown.
Functional Block Diagram
| Part Number | Package Type | RoHS | Temperature |
| Compliant | |||
| A3938SEQ | 32-lead PLCC | No | -20 °C to 85 °C |
| A3938SEQTR | 32-lead PLCC | No | -20 °C to 85 °C |
| A3938SLD | 38-lead TSSOP | No | -20 °C to 85 °C |
| A3938SLD-T | 38-lead TSSOP | Yes | -20 °C to 85 °C |
| A3938SLDTR | 38-lead TSSOP | No | -20 °C to 85 °C |
| A3938SLDTR-T | 38-lead TSSOP | Yes | -20 °C to 85 °C |
| A3938SLQ | 36-lead QSOP | No | -20 °C to 85 °C |
| A3938SLQTR | 36-lead QSOP | No | -20 °C to 85 °C |
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