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| IFX007T大電流PN半橋馬達驅動解決方案 |
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| 文章來源：永阜康科技 更新時間：2019/4/20 9:29:00 |
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infineon公司的IFX007T是集成的大電流半橋馬達驅動器,是工業和多用途NovalithIC™系列的一部分,在同一封裝內包括一個P溝高邊MOSFET和一個N溝低邊MOSFET以及集成的驅動器.由于P溝高邊開關不需要充電泵,因此最小化EMI;由于集成的驅動器IC,具有邏輯電平輸入,電流檢測診斷,轉換速率調整,死區時間產生和對超溫,欠壓和過流與短路的保護,因此和MCU的接口變得很容易,為保護大電流PWM馬達驅動提供非常小板空間的成本最優化解決方案.@25℃時的最大通路電阻12.8 mΩ,高邊最大為6.5 mΩ,低邊最大為6.3 mΩ,限流水平為55A,具有閂鎖特性和欠壓關斷特性,工作電壓高達40V,JESD47I資格,IFX007T和其它IFX007T組成H橋或其它3相驅動配置,主要用在馬達驅動.本文介紹了IFX007T主要特性,框圖和應用電路,以及IFX007T馬達控制板主要特性,Arduino馬達控制電路圖和PCB布局圖.
The IFX007T is an integrated high current half bridge for motor drive applications. It is part of the Industrial &Multi PurposeNovalithIC™ family containing one p-channel high-side MOSFET and one n-channel low-sideMOSFET with an integrated driver IC in one package. Due to the p-channel high-side switch the need for acharge pump is eliminated thus minimizing EMI. Interfacing to a microcontroller is made easy by the integrated driver IC which features logic level inputs, diagnosis with current sense, slew rate adjustment, deadtime generation and protection against overtemperature, undervoltage, overcurrent and short circuit.
The IFX007T provides a cost optimized solution for protected high current PWM motor drives with very lowboard space consumption.
The IFX007T is part of the Industrial &Multi PurposeNovalithIC™ family containing three separate chips in onepackage: One p-channel high-side MOSFET and one n-channel low-side MOSFET together with a driver IC,forming an integrated high current half-bridge. All three chips are mounted on one common lead frame, using the chip-on chip and chip-by-chip technology. The power switches utilize vertical MOS technologies to ensureoptimum on state resistance. Due to the p-channel high-side switch the need for a charge pump is eliminatedthus minimizing EMI. Interfacing to a microcontroller is made easy by the integrated driver IC which featureslogic level inputs, diagnosis with current sense, slew rate adjustment, dead time generation and protectionagainst overtemperature, undervoltage, overcurrent and short circuit. The IFX007T can be combined withother IFX007Ts to form a H-bridge or a3-phase drive configuration.
IFX007T主要特性:
• Path resistance of max. 12.8 mΩ @ 25℃ (typ. 10.0 mΩ @ 25℃)
High side: max. 6.5 mΩ @ 25℃ (typ. 5.3 mΩ @ 25℃)
Low side: max. 6.3 mΩ @ 25℃ (typ. 4.7mΩ @ 25℃)
• Enhanced switching speed for reduced switching losses
• Capable for high PWM frequency combined with active freewheeling
• Switched mode current limitation for reduced power dissipation in overcurrent
• Current limitation level of 55 A min.
• Status flag diagnosis with current sense capability
• Overtemperature shutdown with latch behavior
• Undervoltage shutdown
• Driver circuit with logic level inputs
• Adjustable slew rates for optimized EMI
• Operation up to 40 V
• Green Product (RoHS compliant)
• JESD47I Qualified
圖1. IFX007T框圖
圖2. IFX007T應用電路:兩個IFX007T組成H橋
圖3. IFX007T應用電路:IFX007T(負載接地)組成半橋
IFX007T馬達控制板
The Motor Control Shield adds powerful motor control to the Arduino projects. The shield can be controlledwith the general logic IO-Ports of a microcontroller. Either an Arduino Uno or the XMC1100 Boot Kit fromInfineon can be used as the master.On board of the Motor Control Shield are three IFX007T NovalithICTM. Each is featuring one P-channel high sideMOSFET and one N-channel low side MOSFET with an integrated driver IC in one package. Due to the P-channelhigh side switch a charge pump is not needed.
The IFX007T half-bridge is easy to control by applying logic level signals to the IN and INH pin. When applying aPWM to the IN pin the current provided to the motor can be controlled with the duty cycle of the PWM. With anexternal resistor connected between the SR pin and GND the slew rate of the power switches can be adjusted.The Motor Control Shield can be easily connected to any Arduino board or the XMC1100 Boot Kit via headers.
The application targeted by the IFX007T devices is brushed DC/brushless DC Motor Control. Besides MotorControl any other inductive, resistive and capacitive load within the electrical characteristics of the NovalithIC™can be driven by the IFX007T. In the Motor Control Shield three IFX007T are used. Each is capable of driving up to 55 A. The limited thermal performance of the Shield PCB limits the recommended maximum current to 30 A.
圖4. IFX007T馬達控制板外形圖
IFX007T馬達控制板主要特性:
• An Arduino Uno, XMC1100 Boot Kit, or similar board connected to the shield can control the three halfbridgesvia the general IO pins.
• Brushed DC Motor Control up to 250 W continuous load
- 8 – 24 V nominal input voltage (max. 6 – 40 V)
- Average motor current 30 A restricted due to the limited power dissipation of the PCB (IFX007T currentlimitation @ 55 A min.)
• Drives either one brush/less DC motor, one brushed bi-directional DC motor or three uni-directional DCmotors.
• Capable of high frequency PWM, e.g. 25 kHz
• Adjustable slew rates for optimized EMI by changing external resistor
• Driver circuit with logic level inputs
• Status flag diagnosis with current sense capability
• Protection e.g. against overtemperature and overcurrent
• Reverse polarity protection with IPD90P04P4L
• Further comments:
- Due to limited performance caused by the PCB layout, we recommend our customers to remove thecapacitance C5 for high frequency applications. It is only layout related, not refer to the device.
- The size of the DC-link capacity (C4 in schematic) with 560 μF is for most applications sufficient. But forhigh current applications, we recommend our customers to follow the design rule in our applicationnote and replace the DC-link cap with a bigger one.
- Due to the limited area of the PCB and the small DC-link cap, the demoboard shouldn ’t be used forshort circuit test.
- This demoboard is designed for both sensorless applications and the application with Hall sensor. Butfor the application with sensor, please remove R36/R37/R38 and solderR18/R19/R20/R21/R22/R23/R25/R26/R27.
- Due to the limited pinout of the Arduino shield all IS pins of the three devices are connected together.
According to different applications the value of R4 could be adjusted to achieve a better current senseperformance.
圖5.采用IFX007T的Arduino馬達控制電路圖
圖6.采用IFX007T的Arduino馬達控制板PCB布局圖
圖7.馬達控制板連接器
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