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Application Report

SPRABS1–February 2013

High-Voltage Half-Bridge LLC Resonant DC/DC Converter

With Synchronous Rectification Hardware Kit

Daniel Chang...................................................................................................................................

ABSTRACT

The TMDSHVRESLLCKIT provides a great way to learn and experiment with using a single MCU to

control a half-bridge LLC resonant DC/DC converter with synchronous rectification. This application report

goes over kit contents, the kit hardware details and explains the functions and locations of jumpers and

connectors present on the board. This document supersedes all the documents available for the hardware

of this kit.

Figure 1. TMDSHVRESLLCKIT Board Picture

Piccolo, Code Composer Studio, C2000 are trademarks of Texas Instruments.

All other trademarks are the property of their respective owners.

SPRABS1–February 2013 High-Voltage Half-Bridge LLC Resonant DC/DC Converter With Synchronous

Rectification Hardware Kit

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Summary of content (11 pages)

PAGE 1
Application Report SPRABS1 – February 2013 High-Voltage Half-Bridge LLC Resonant DC/DC Converter With Synchronous Rectification Hardware Kit Daniel Chang................................................................................................................................... ABSTRACT The TMDSHVRESLLCKIT provides a great way to learn and experiment with using a single MCU to control a half-bridge LLC resonant DC/DC converter with synchronous rectification.
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Getting Familiar With the Kit www.ti.com WARNING This EVM is meant to be operated in a lab environment only and is not considered by TI to be a finished end-product fit for general consumer use. This EVM must be used only by qualified engineers and technicians familiar with risks associated with handling high voltage electrical and mechanical components, systems and subsystems.
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Hardware Overview www.ti.com The board can accept any of the C2000™ series controlCARDs. A F28027 control card is shipped with the kit. Software changes may be necessary so that the board will work with a different controlCARD. All features may not be supported by all controlCARDs. 1.
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Hardware Overview www.ti.com This board uses the C2000 to control a half-bridge LLC resonant DC/DC converter with synchronous rectification. The power stage regulates the output voltage using 2P2Z and PID closed-loop control. Figure 3 shows the circuit diagram. LLC Resonant Vin Vout Figure 3. TMDSHVRESLLCKIT Circuit Diagram 2.1 Macro Blocks The high-voltage half-bridge LLC resonant DC/DC converter with synchronous rectification board is divided into functional groups referred to as macro blocks.
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Hardware Overview www.ti.com [Main] – Main Board area [M3] – Aux-DC-Power macro [M4] – Isolated-USB-to-JTAG macro [M1] – LLC Resonant + SR macro [M2] – 400V-to-15V DC/DC macro Figure 4. TMDSHVRESLLCKIT Macro Block Locations 2.2 Powering the Board The high-voltage half-bridge LLC resonant DC/DC converter with synchronous rectification kit board has two separate power domains and two major modes of operation.
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Hardware Overview • • www.ti.com Demo Mode: Uses the GUI to quickly show how the board functions. All power used by the board is provided from a single 390V DC power supply. 1. Insert a pre-flashed F28027 control card into socket [Main]-H1. 2. Connect your computer to the board using a USB cable. 3. Verify the following jumper settings: (a) Jumpers are placed on [Main]-J1, J2, J3, J4, J5. (b) Jumpers are placed on pins 1-2 on [Main]-J7, J8. (c) A jumper is placed on [M4]-J4.
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Hardware Overview www.ti.com 2.3 Boot Modes Table 1 describes the jumper and switch settings that are needed for booting from Flash and SCI for the board. Table 1.
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Hardware Resource Mapping www.ti.com 3 Hardware Resource Mapping 3.1 Resource Allocation Figure 5 shows the various stages of the board in a circuit diagram format and illustrates the major connections and feedback values being mapped to the C2000 MCU. Table 2 lists these resources. It is important to note that not all resources are available on every C2000 MCU. For more detailed information, see the schematics and device-specific data sheets. Table 2.
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Hardware Resource Mapping www.ti.com F28027 Vo-fb Ip-cs CPU V-SR1 V-SR2 I-SR1 I-SR2 ADC 32 bit DSP core 60 MHz 12 bit 4.6 MSPS 3V3 Vref Comms I2C SPI UART PWM1 (HR) 1A / 1B PWM2 (HR) 2A / 2B PWM3 (HR) 3A / 3B PWM4 (HR) 4A / 4B LLC Resonant Vo-fb Vin Vout 1A V-SR1 V-SR2 I-SR1 I-SR2 Ip-cs 1B 2A 3A Figure 5. TMDSHVRESLLCKIT Circuit Diagram 3.2 Jumpers, Connectors, and Switches Table 3 lists the jumpers, connectors, and switches available on the board.
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Hardware Resource Mapping www.ti.com Table 3. Description of Jumpers, Connectors, and Switches (continued) [Main]-J5 3V3 Enable Jumper. Enables the 3V3 auxiliary power rail. [Main]-J6 JTAG enable jumper. Enables JTAG connection to the microcontroller. This jumper needs to be unpopulated when booting from FLASH, SCI, or another medium. [Main]-J7 Mux selection between V-SR2 (pins 2-3) and I-SR2 (pins 1-2). [Main]-J8 Mux selection between V-SR1 (pins 2-3) and I-SR1 (pins 1-2).
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.