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STA6940M: Brushed DC Motor Driver IC With PWM Control (PDF)
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STA6940M: Allegro MicroSystems Announces New 8 A H-Bridge Motor Driver
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STA6940M
Brushed DC Motor Driver IC With PWM Control
Features and Benefits
- Power supply voltage, VBB, 44 V maximum, 10 to 40 V normal operating range
- Logic supply voltage, VDD, 3 to 5.5 V compatible
- Output current, IO, 4 A average, 8 A maximum
- Output elements are all N-channel MOSFETs to reduce losses
- Internal charge pump
- Forward, reverse, free, and brake control modes available
- Constant-current control:
- Off-time 35 µs, fixed (Slow Decay mode)
- Internal Overcurrent Protection (OCP) circuitry
- Off-time 142 µs fixed (Fast Decay mode)
- Internal Thermal Shutdown (TSD) circuitry
- ZIP type 18-pin fully-molded package (STA package)
Description
Combining low-power CMOS-compatible logic with high-current, high-voltage power MOSFET outputs, the STA6940M provides complete control and drive for brush DC motors. It provides internal fixed off time, pulse-width modulation (PWM) control of the output current, rated for 4 A normal operating level.
The CMOS logic section provides four modes of operation: forward and reverse normal drive rotation, outputs-off free spin (coast), and electronic braking.
The innovative multi-chip internal structure separates the main logic IC (MIC) from the four N-channel power MOSFETs. This results in lower thermal resistance and greater efficiency.
PWM control allows constant-current control of output while reducing heat generation and power losses by providing fixed off-time dual decay modes. The internal charge pump ensures full power availability for switching.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Distributor Stock | Samples |
|---|---|---|---|---|---|---|---|
| STA6940M | 18-lead ZIP | Yes | -- | -40 °C to 125 °C | new |
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.