Fully Integrated High Frequency Synchronous Buck Converter IS6608A Usage Guide
1. Product Guide
IS6608A is the first multi-phase parallel power supply chip for CPU power supply in China, which is compatible with the PMBusTMHigh-frequency synchronous voltage-reduction converter of the interface. Using a 4mmx5mm FCQFN-25 package, it can achieve an output current of up to 30A per phase in a wide input range and can support up to 8 chips in parallel to achieve a peak output current of 240A. In the field of high-current applications, IS6608A Fully integrated high frequency synchronous buck converter enables excellent current sharing and phase interleaving functions, minimizing the use of existing.
IS6608A The GUI and peripheral circuit configuration can be modified according to the diversification of terminal use scenarios, in order to help customers complete the product design and import, this article will systematically explain the use of the IS6608A instructions and layout suggestions, and simply and clearly introduce the matters needing attention in the use of the chip to the readers.
2. Use instructions for the GUI
IS6608A GUI It is a graphical user interface software tool independently developed by Changge Micro and used for supporting IS6608A design, which can help users debug the internal configuration more quickly and intuitively. IS6608A GUI Following the PMBUS protocol, interact with IS6608A by USB-to-I²C (dongle).
-2.1.GUI write and burn steps
Step 1: Click SCAN to find the established mailing address
Step 2: Select the required mailing address
Step 3: Select the required operation classification
Step 4: Modify the data in the operation area
Step 5: Write the modified data into the chip
Step 6: Click STORE to input the chip data into the MTP
2.2 Output voltage adjustment
VOUT COMMAND And VOUT _ SCALE _ LOOP is used to set the VFB voltage with the formula:
For example, Rtop=2kΩ,Rbottom=6kΩ, VOUT=0.8V, the output voltage step is as follows:
According to Rtop = 2 kΩ, Rbottom = 6 kΩ, then VOUT _ SCALE _ LOOP = 6 kΩ / (2 kΩ + 6 kΩ) =0.75;
VOUT=0.8V，VOUT COMMAND=0.8V；
Click UPDATE to write the data to the register;
Click the Store to deposit the data in the register into MTP, then VFB=0.8V*0.75=0.6V.
2.3 Readout of the VOUT values
The actual read value of chip VOUT voltage read is VFB voltage. If the correct output voltage is required in Detection, VOUT COMMAND should be configured with VOUT _ SCALE _ LOOP to display the correct value.
Example the application of the Rtop=2kΩ,Rbottom=6kΩ,VOUT=0.8V by reading the output voltage step as follows:
According to Rtop = 2kΩ, Rbottom = 6kΩ, then VOUT _ SCALE _ LOOP = 6 kΩ / (2kΩ + 6kΩ) =0.75;
VOUT=0.8V，VOUT COMMAND=0.8V；
Click UPDATE to write the data to the register;
Click Detection to read the correct VOUT voltage on the GUI.
Note: The accuracy of the external VFB partial voltage resistance can affect the accuracy of the VOUT reads.
IS6608A With perfect protection functions, including overcurrent protection (OCP), negative overcurrent protection (NOCP), overpressure protection (OVP), Undervoltage locking (UVLO), and over temperature protection (OTP), and other protection mechanisms, used in the failure or accident action and abnormal, the protection chip is not damaged.
2.4 OTP protection mode setting
The default OTP protection temperature for the latest version of IC is 146℃. The protection mode can be selected in Latch and Retry [hysteresis temperature including RETRY], and the default is Latch. The following figure shows the modification steps:
2.5 Setting of the OCP protection mode
The default DC protection current is 32.66A, and the protection mode can be selected in Latch and Retry [Hiccup Time including Retry], and the default is Latch. The following figure shows the modification steps:
2.6 Setting of the OVP protection mode
The default overvoltage protection value is 130% * Vref, The protection mode can be selected in Latch and Retry [including recovery voltage and protection mode of Retry], the default is Latch. The following figure shows the modification steps:
There are four response configurations for OVP protection mode, namely Latch & Hiccup and w/Vo DISC & w/o Vo DISC, as follows:
Latch: After overvoltage, the power lock, needs to restart manually
Hiccup: When the overvoltage protection is triggered, it will drop to the
voltage set by OVPRecovery Level and power on again;
W / Vo DISC: When the overvoltage protection is triggered, the VoDischarg function is used to pull down the output voltage;
W / o Vo DISC: When the overvoltage protection is triggered, reduce the output voltage without using the Vo Discharge function.
2.7 Chip operating frequency and mode settings
The default operating frequency of the chip is 800kHz, and the default operating mode is FCCM. The following figure shows the classification of function settings:
3. Route/layout suggestions
IS6608A The periphery contains a variety of functional pin configurations, which have high requirements for IC routing and element placement. Good peripheral routing/layout can effectively affect the working efficiency and stability of the chip. In addition, the peripheral circuits can also provide good electromagnetic compatibility, noise reduction, and anti-interference ability. It is worth noting that in the absence of specific requirements, GUI is not essential for the use of IS6608A, but routing/layout is one of the things that users need to pay attention to. Route/layout recommendations are as follows:
1. 3K resistance per phase ISHR pin in the near end of multiphase parallel;
2. Place a sufficient amount of VIA directly below the chip and the VIN/GND pin as possible;
3. 1μF 0402 small capacitor filter;
4. Sensitive routing [such as VFB-RGND / SYNC / ISHR / VC] needs to avoid interference signals [such as SW / BST / VIN] placed;
5. The BST circuit is as short as possible;
6. VC C/V DRV capacitor should be placed as close to the pin as far as possible;
7. The ISET / ADDR / ADDPH resistance is placed as close to the pin as possible and requires a 1% precision resistance.
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