MPS HR1200 Manuale utente

AN103

User Guide for the HR1200 I2C Kit and GUI

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User Guide for the

HR1200 I2C Kit and GUI

Application Note

Prepared by Danica Jiang

August 2017

AN103 – USER GUIDE FOR THE HR1200 I2C KIT AND GUI

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ABSTRACT

This user guide contains guidelines to configure the electrical parameters and program the HR1200.

This guide also provides step-by-step instructions on how to use the GUI and I2C Kit.

AN103 – USER GUIDE FOR THE HR1200 I2C KIT AND GUI

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QUICK START GUIDE

Preconditions

1) Ensure that the PCB layout of the IC meets our requirements detailed in the AN102 application note,

“HR1200 High Performance PFC+LLC Controller”.

2) Connect the pins of the Kit correctly to the corresponding pins of the IC in the EVB.

Operation Sequence

Start

Connect Kit to USB Port

Press “Scan”

Open GUI

Close GUI

Press “Scan”

Open GUI

Close GUI

Reset Kit and EVB (1)

End

Design / Import / Export / ProgramDesign / Import / Export / Program / Monitor / Debug

NOTE:

1) Reset Kit: Ensure that VCC of the Kit is fully discharged below 2V. The discharge time may vary with different application designs.

Reset EVB: Offline mode: Ensure that VCC of the EVB is fully discharged.

Online mode: Ensure that VCC of the EVB is fully discharged and the bus bulk capacitor is discharged below 10V.

AN103 – USER GUIDE FOR THE HR1200 I2C KIT AND GUI

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TABLE OF CONTENTS

1.Introduction........................................................................................................................................5

2.I2C Function of the HR1200...............................................................................................................5

3.I2C Kit ................................................................................................................................................5

4.USB Isolator ......................................................................................................................................6

5.I2C Interface and Protocols................................................................................................................6

6.Step-by-Step Guide for Offline Programming....................................................................................7 

7. Step-by-Step Guide for Online Programming and Monitoring .........................................................15

8.Appendix A: USB Driver Installation ................................................................................................18

9.Appendix B: Register Address.........................................................................................................21

10.Appendix C: Common Faults and Troubleshooting.........................................................................23

AN103 – USER GUIDE FOR THE HR1200 I2C KIT AND GUI

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1. INTRODUCTION

The HR1200 integrates a digital PFC controller and an analog LLC controller into a single chip. Under

different input and output conditions, the digital PFC enables customers to optimize PFC performance

through programming.

There are 1k bytes of EEPROM available. All design parameters can be written into the chip through

the I2C interface and GUI.

2. I2C FUNCTION OF THE HR1200

The I2C function is workable under two conditions:

1) The IC is in normal operation and no protection has been triggered, particularly under-voltage

lockout (UVLO) and X-cap discharge, which can affect the programming.

2) The IC enters a dedicated test mode when given a pre-determined pulse group on BURST.

Figure 1 shows the HR1200 pins. Pins required for the I2C function are indicated in the red dotted

boxes. For programming, RES and CSP should be connected to GNDD through a 20kresistor. V3.3

should be connected to GNDS through a 4.7 ~ 10µF decoupling ceramic capacitor. GNDS should be

connected with GNDD. For BURST, considering the pull-down resistor in the Kit, the HR1200 BURST

capacitor should be selected carefully to guarantee a full discharge within 100µs.

Figure 1: Pins of the HR1200

3. I2C KIT

The Kit has six output signals (see Figure 2). GND is the ground reference. SCL and SDA are standard

I2C communication pins. VCC and VREG are power supply pins. BURST is the mode control pin. Kit

pins should be connected to the IC pins in the EVB accordingly.

The computer’s USB port can provide the Kit with 5V DC voltage. Once the Kit connects successfully

with both the USB port and EVB, it can operate in two different modes by detecting the VCC voltage.

Online Mode: If the Kit detects that VCC is higher than 8V when it is hooked up, it will provide

power to VCC only.

Offline Mode: If the Kit detects that VCC is lower than 8V when it is hooked up, it will provide

power to VCC, VREG, and send a pre-determined signal to BURST.

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Figure 2: Pins of I2C Kit

When starting up for the first time, it is recommended to program the Kit in offline mode. If the chip is

pre-programmed, this step can be skipped. When programming is finished, remember to close the GUI

and exit the program. To reset the Kit and EVB, disconnect the Kit from the USB port to fully discharge

VCC.

To monitor the input and output of the PFC stage or achieve real-time programming, it is recommended

to run in online mode. For standby power, no load or light load evaluations, it is not recommended to

keep the Kit connected to the board, as the current consumption of the IC will be influenced.

4. USB ISOLATOR

Since the HR1200 is a primary-side controller, its reference ground is coupled to the AC line (point A).

Through the Kit, point A is connected to the USB reference ground of the computer (point B, the

negative side of 5V DC voltage). If the USB reference ground connects with earth ground, there is a

short-circuit path from the line or neutral to earth ground, as shown in Figure 3 with the red dotted line.

Components along the path such as the rectifier bridge and the USB port are at risk of being damaged.

To avoid this, a USB isolator is needed between the I2C Kit and computer USB port.

Figure 3: Short-Circuit Risk

5. I2C INTERFACE AND PROTOCOLS

Aside from the reference ground, the standard I2C/PMBus interface consists of SCL and SDA lines. For

multiple I2C devices, both masters and slaves can be connected to the I2C bus (see Figure 4).

Figure 4: Standard I2C Bus Connection

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Figure 5 shows various I2C/PMBus protocols supported by the HR1200 under different conditions. The

relevant USB driver should be installed in advance. Refer to Appendix A for installation instructions.

Figure 5: HR1200 I2C Protocols

6. STEP-BY-STEP GUIDE FOR OFFLINE PROGRAMMING

Step 1: Connect the Kit to the computer USB port.

Step 2: Connect the Kit with the EVB after the Kit is recognized by the computer (see Figure 6).

Figure 6: Kit Recognized by Computer

Step 3: Load the GUI folder and double click “HR1200” to start up the GUI (see Figure 7). Then the

interface shown in Figure 8 appears.

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Figure 7: GUI Start-Up

Figure 8: GUI Start-Up Interface

Step 4: Press “SCAN”. The Kit performs the following actions automatically.

A. Connection Check

If there is something wrong with the connection between the Kit and USB port, the prompt

box shows: “Please connect I2C Kit to USB port correctly.”

If there is something wrong with the connection between the Kit and EVB, the prompt box

shows: “Please check whether Kit connects to EVB correctly.”

If the Kit connects successfully with both the USB port and EVB, then the Kit proceeds to

Mode Recognition.

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B. Mode Recognition: In this case, VCC is below 8V, and the IC enters offline mode (see Figure

9). Fixed VCC, VREG, and pre-determined BURST values are sent to the EVB.

Warning:

DO NOT CONNECT THE AC INPUT in offline mode.

RESET THE KIT AND EVB every time before restarting the GUI. Detach the Kit from USB port and

make sure VCC of both the Kit and EVB is fully discharged before making the connection again.

Figure 9: Main Interface in Offline Mode

Step 5: Configure the parameters of the digital PFC part of the HR1200 by selecting various menu

items on the GUI interface (see the below list). Personal design parameters can also be imported.

A. Circuit Panel

This panel configures EVB inputs, outputs, and several key design parameters (see Figure 9).

Table 1 explains the circuit panel parameters. Po, Rcs, and Co must be consistent with the actual

circuit. They also affect the bode plots of the power stage in “Loop Design” panel.

Table 1: Circuit Panel Parameters

Item Unit Description Range

Vin_min VAC Minimum input voltage 0 ~ 305

Vin_max VAC Maximum input voltage 0 ~ 305

fin Hz Input voltage frequency 50/60

Cin µF Total input capacitance

Ri1, Ri2 Divider resistor to sense input voltage Ratio is fixed at 0.0032

L µH PFC inductor

Vo V Output voltage 0 ~ 500

Po W Rated output power

Co µF Output capacitance

Ro1, Ro2 Divider resistor to sense output voltage Ratio is fixed at 0.0032

Rcs Current sense resistor

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Po and Rcs determine VCOMP_MAX. Since VCOMP_MAX is also limited internally by the chip, the larger Po

is, the smaller Rcs should be. See Equation (1):

256

0032.05.06.1)(

_















refADC

numberbitADC

MAXCOMP V

RcsPodigitalV

(1)

B. Design Panel, Basic

This panel controls the working state of the PFC and LLC separately and configures some basic

parameters (see Figure 10). Table 2 explains the parameters of this panel. The difference between

LLC Enable Voltage and LLC Disable Voltage affects the hold-up time of the converter. The input

voltage is divided into four ranges by vin level 1, vin level high/low, and vin level 2.

Figure 10: Basic Design Panel

Table 2: Basic Design Panel Parameters

Item Unit Description Range

PFC Power on the system ON/OFF

LLC Enable or disable the LLC part ON/OFF

Burst Sync PFC and LLC with same burst frequency ON/OFF

LLC Enable Voltage V Threshold to turn on LLC.

LLC is turned on if the PFC output voltage is larger. 0 ~ 430

LLC Disable Voltage V Threshold to turn off LLC.

LLC is turned off if the PFC output voltage is less.

Less than LLC

Enable Voltage

hysteresis V Input voltage level hysteresis 0 ~ 30

vin level 2 V VIN-R2: vin level 2 + hys < Vin < vin level high/low

VIN-R1: Vin < vin level 2 0 ~ 430

vin level high/low V High line: Vin > vin level high/low + hys

Low line: Vin < vin level high/low 0 ~ 430

vin level 1 V VIN-R4: Vin > vin level 1 + hys

VIN-R3: vin level high/low + hys < Vin < vin level 1 0 ~ 430

Boot Time at High Line ms Soft-start time of the PFC at high-line voltage

Boot Time at Low Line ms Soft-start time of the PFC at low-line voltage

Indice

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