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当前位置：首页 -> 方案设计 |
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| ST VNH5019A汽车马达驱动解决方案 |
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| 文章来源： 更新时间：2014/9/5 11:05:00 |
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ST公司的VNH5019A-E是全桥马达驱动器,集成了双路高边驱动器和两个低边开关,三个芯片封装在MultiPowerSO-30封装中,引线框是电绝缘的.汽车级产品,输出电流3A,3V CMOS兼容输入,PWM频率高达20kHz,用于各种汽车应用.本文介绍了VNH5019A主要特性,框图和 种应用电路,以及马达驱动评估板STEVAL-VNH5019A主要特性,电路图和材料清单.
The VHN5019A-E is a full bridge motor driver intended for a wide range of automotive applications. The device incorporates a dual monolithic high-side drivers and two low-side switches. The high-side driver switch is designed using STMicroelectronics’ well known and proven proprietary VIPower® M0 technology that allows to efficiently integrate on the same die a true Power MOSFET with an intelligent signal/protection circuit.
The three dice are assembled in MultiPowerSO-30 package on electrically isolated lead-frames. This package, specifically designed for the harsh automotive environment offers improved thermal performance thanks to exposed die pads. The input signals INA and INB can directly interface to the microcontroller to select the motor direction and the brake condition.
The DIAGA/ENA or DIAGB/ENB, when connected to an external pull-up resistor, enable one leg of the bridge. They also provide a feedback digital diagnostic signal. The CS pin allows to monitor the motor current by delivering a current proportional to its value when CS_DIS pin is driven low or left open. The PWM, up to 20 KHz, lets us to control the speed of the motor in all possible conditions. In all cases, a low-level state on the PWM pin turns-off both the LSA and LSB switches. When PWM rises to a high-level, LSA or LSB turn-on again depending on the input pin state.Output current limitation and thermal shutdown protects the concerned high-side in short to ground condition.
The short to battery condition is revealed by the overload detector or by thermal shutdown that latches off the relevant low-side. Active VCC pin voltage clamp protects the device against low energy spikes in all configurations for the motor.
CP pin provides the necessary gate drive for an external n-channel PowerMOS used for reverse polarity protection.
VNH5019A主要特性:
■ ECOPACK®: lead free and RoHS compliant
■ Automotive Grade: compliance with AEC guidelines
■ Output current: 30 A
■ 3 V CMOS compatible inputs
■ Undervoltage and overvoltage shutdown
■ High-side and low-side thermal shutdown
■ Cross-conduction protection
■ Current limitation
■ Very low standby power consumption
■ PWM operation up to 20 khz
■ Protection against:
– Loss of ground and loss of VCC
■ Current sense output proportional to motor current
■ Charge pump output for reverse polarity protection
■ Output protected against short to ground and short to VCC
图1. VHN5019A框图
图2. VHN5019A带电池反向保护的DC-20kHz PWM应用电路(选择A)
图3. VHN5019A带电池反向保护的DC-20kHz PWM应用电路(选择B)
图4. VHN5019A多个马达驱动配置图
马达驱动评估板STEVAL-VNH5019A
STEVAL-VNH5019A offers dedicated power stage and controls suitable for electric DC motor driving. This evaluation board comes pre-assembled with VNH5019A H-bridge belonging to the VNH Motor Driver series based on VIPower®proprietary technology. Typical applications are Windows Lift, Sliding Door, Seat regulation.
This Evaluation Board consists of a motherboard (STM8 Universal Board) and a daughterboard.
The motherboard, based on STM8 microcontroller, provides the logic section for monitoring and driving the VNH5019A assembled in the daughterboard.
With the aim to make simpler the board usage and settings, ST provides a dedicated and user-friendly software with a Graphic User Interface (GUI). This enables the user to set VNH5019A parameters (PWM, Motor direction…) and at the same time it shows real time device diagnostic information like current output evolution, battery voltage monitoring, board temperature and much more.
马达驱动评估板STEVAL-VNH5019A主要特性:
Handling up to 30 A of maximum motor current output
Undervoltage and overvoltage shutdown
Device thermal protection
Cross-conduction protection
Very low standby power consumption
Programmable PWM operation (up to 20 kHz)
Protection against loss of ground and loss of VCC
Motor current monitoring (thanks to VNH5019A current sense output)
On-board charge pump output for reverse polarity protection
Device output protected against short to ground and short to VCC
Graphic User Interface (GUI)
图5. 马达驱动评估板STEVAL-VNH5019A外形图
图5. STEVAL-VNH5019A子板电路图(1)
图6. STEVAL-VNH5019A子板电路图(2)
图7. STEVAL-VNH5019A子板PCB设计图:顶层
图8. STEVAL-VNH5019A子板PCB设计图:底层
图9. STEVAL-VNH5019A STM8主板电路图:I/O和本体应用
图10. STEVAL-VNH5019A STM8主板电路图:STM8和电源
图11. STEVAL-VNH5019A STM8主板电路图:USB接口
图12. STEVAL-VNH5019A STM8主板顶层PCB设计图
图13. STEVAL-VNH5019A STM8主板底层PCB设计图 |
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