TMS320F28027F和LM5170的四相雙向汽車12V/48V電源系統（TI方案）

TI公司的TIDA-01168是四相雙向汽車12V/48V電源系統參考設計,采用兩個LM5170-Q1電流控制器和TMS320F28027F微控制器(MCU),12V輸入電壓范圍6V-18V, 48V輸入電壓范圍24V-54V,具有反極性,過流和過壓以及超溫保護,多相可升級選擇,輸出功率2kW,效率97%,主要用在12V/48V汽車電源分配,超級電容或電池備份電源轉換器.本文介紹了LM5170-Q1主要特性,框圖,60A雙相48V/12V雙向轉換器應用電路以及參考設計TIDA-01168主要特性和系統指標,框圖,電路圖,材料清單和PCB設計圖.

　　The LM5170-Q1 controller provides the essential highvoltage and precision elements of a dual-channelbidirectional converter for automotive 48-V and 12-Vdual battery systems. It regulates the average currentflowing between the high voltage and low voltageports in the direction designated by the DIR inputsignal. The current regulation level is programmedthrough analog or digital PWM inputs.

　　Dual-channel differential current sense amplifiers anddedicated channel current monitors achieve typicalcurrent accuracy of 1%. Robust 5-A half-bridge gatedrivers are capable of driving parallel MOSFETswitches delivering 500 W or more per channel. Thediode emulation mode of the synchronous rectifiersprevents negative currents but also enables discontinuous mode operation for improved efficiencywith light loads. Versatile protection features includecycle-by-cycle current limiting， overvoltage protectionat both HV and LV ports， MOSFET failure detectionand overtemperature protection.

　　An innovative average current mode control schememaintains constant loop gain allowing a single R-Cnetwork to compensate both buck and boostconversion. The oscillator is adjustable up to 500 kHzand can synchronize to an external clock. Multiphaseparallel operation is achieved by connecting twoLM5170-Q1 controllers for 3- or 4-phase operation， orby synchronizing multiple controllers to phase-shiftedclocks for a higher number of phases. A low state onthe UVLO pin disables the LM5170-Q1 in a low

　　current shutdown mode.

　　LM5170-Q1主要特性：

　　1? AEC-Q100 Qualified for Automotive Applications：

　　– Device Temperature Grade 1： –40℃ to

　　+125℃ Ambient Operating Range

　　– Device HBM ESD Classification Level 2

　　– Device CDM ESD Classification Level C4B

　　? 100-V HV-Port and 65-V LV-Port Max Ratings

　　? 1% Accurate Bidirectional Current Regulation

　　? 1% Accurate Channel Current Monitoring

　　? 5-A Peak Half-Bridge Gate Drivers

　　? Programmable or Adaptive Dead-Time Control

　　? Programmable Oscillator Frequency With OptionalSynchronization to External Clock

　　? Independent Channel Enable Control Inputs

　　? Analog and Digital Channel Current Control Inputs

　　? Programmable Cycle-by-Cycle Peak Current Limit

　　? HV and LV Port Overvoltage Protection

　　? Diode Emulation Prevents Negative Current

　　? Programmable Soft-Start Timer

　　? MOSFET Failure Detect at Start-Up and CircuitBreaker Control

　　? Multiphase Operation Phase Adding or Dropping

　　LM5170-Q1應用：

　　? Automotive Dual-Battery Systems

　　? Super-Cap or Battery Backup Power Converters

　　? Stackable Buck or Boost Converters

圖1.LM5170-Q1功能框圖

圖2.LM5170-Q1簡化應用電路圖

圖3.LM5170-Q1應用電路:60A雙相48V/12V雙向轉換器

參考設計TIDA-01168

The TIDA-01168 reference design is a four-phase, bidirectional DC-DC converter development platform for 12-V/48-V automotive systems. The system uses two LM5170-Q1 current controllers and a TMS320F28027F microcontroller (MCU) for the power stage control. LM5170-Q1 subsystems use average current feedback for current control whereas the C2000? microcontroller provides voltage feedback.? Such a control scheme eliminates phase current balancing typical for multiphase converters. A system based on LM5170-Q1 allows a high level of integration, which reduces printed-circuit board (PCB) area, simplifies design, and speeds up development.
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圖4.參考設計TIDA-01168外形圖

參考設計TIDA-01168主要特性:

12V input voltage range:? 6V to 18V
48V input voltage range:? 24V to 54V
Reverse polarity, overcurrent overvoltage and overtemperature protection
Multiphase scalable option
Highly integrated solution using automotive qualified components

參考設計TIDA-01168應用:

? In-Vehicle Power Distribution in 12-V/48-VAutomotive Systems
? Supercapacitor or Battery Backup PowerConverters
參考設計TIDA-01168主要系統指標: