The A4937 is a three-phase controller that can be used with N-channel external power MOSFETs and is specifically designed for automotive applications.
The unique charge-pumped regulator provides a complete (>10 V) gate driver to handle battery voltages as low as 7 V and allows the A4937 to operate when the gate driver voltage drops to 5.5 V.
Bootstrap capacitors are used to provide the battery supply voltage described above required by N-channel MOSFETs.
The device provides full control of all six power MOSFETs in a three-phase bridge via a single SPI-compatible serial interface, allowing the motor to be driven by blocking or overlapping commutation. The power output can be adjusted via one or two PWM inputs. Integrated cross-control and programmable no-inductive time keep the power MOSFET free from breakdown.
Integrated diagnostics indicate undervoltage, over-temperature, and power bridging faults, and can be configured to protect the power MOSFETs in most short-circuit situations. Detailed diagnostics are available in the form of serial data words.
The A4937 is available in a 28-pin TSSOP power package with an exposed heatsink for enhanced thermal functionality (package type LP). Lead-free package with 100% matte tin plated pin frame.
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电子动力转向（EPS、EHPS、EAS）
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液压泵
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变速器传动装置
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高电流三相门极驱动，能够驱动 N 通道 N-channel MOSFET
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SPI 兼容的串行控制
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交叉导通保护
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可编程的无感时间
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5.5 至 50 V 电源电压范围
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可兼容 TTL 输入的 3.3 V 和 5 V 逻辑
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广泛的诊断输出
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低电流休眠模式