Hi, I am trying to understand and design a LCC Converter

I read lots of documents about LLC and read "Design of efficient LCC based on ICL5102/HV combo controller IC" for LCC, I think I have a decent amoun of knowledge about the working principles but I have no idea about the selection of components, while there are lots of design guides about LLC I could not find a good design guide for LCC converter and the one infineon provides is using a tool which is kind of black box. And the tool does not let me go to the Vout of 2000 V (which I needed it in my project). Is there a design guide (application note) for a LCC converter ? Or do you suggest anything to me ?

Thanks in advance

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Hi, I am currently working on XDPL8210 IC and facing some issues while parameter setting in dp Vision Gen2 GUI interface.

First of all, i have an excel design tool for XDPL8210 IC but it is password protected and i am not able to change or update as per my design requirements and then i just somehow managed to unlock this tool and used this to calculate parameters as per my design requirements. 

Secondly, CSV file for XDPL8210 is downloaded from site and when i tried to enter parameters as per my design in the CSV file, it showed errors and warnings even if all the entered parameters are in specified range as per tool.

It may be possible that CSV file is corrupted.

Please share Actual Excel based design tool for XDPL8210 IC and CSV file for XDPL8210 as i am not able to find it on site.

Please help in this matter.

Thanks.

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Need help with the following issue:

We have been chasing a low current “strobing” bug that has recently showed up in our drivers.  We have chased this down most of the components on the board, and finally replaced the XDPL8105 with a surplus chip from an older date code and the problem was resolved.  No other BOM change has gotten us any improvement, but we are collecting a larger sample size now.

 

Datecode of “Strobing” controller is H2127

 

Date code of “Good” controller is H2114

 

Parameter sets are identical, but we are also seeing slighting different dimming curves as well between the two, and the “strobing” units minimum dim value is about 10W higher.  (Ie. “Good” unit is stable at 4W, “Strobing” unit is unstable and does not operate below 11W before dimming to off.)

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Hello,

I'm writing code for communicating with a TLD7002 for a development tool, and would like to ask a few questions concerning the calculation of the CRC sums. As the driver library is not yet available to me, I'm implementing basic access to the HSLI in the programming language I'm using.

The datasheet of the TLD7002-16ES specifies two types of CRC algorithms, a 3-bit CRC, and an 8-bit CRC.

1. Regarding the 3-bit CRC, in the software design training video there appears a step where the crc value is reflected (mirrored) after processing the first 5 bits:

 

 

/* get reflected CRC3 value */
crc = TLD7002_MIRROR_MID_CRC3[crc];

 

 

I cannot find this step in the datasheet on page 67, though — an extra step reflecting the crc value after the first 5 bits and the tail 8 bits is not mentioned there; is the datasheet correct regarding the calculation of the 3-bit CRC?

2. The CRC-8 is defined as using the generator polynomial "0x8e = x^8 +x^4 +x^3 +x^2 +1" from CRC-8-AUTOSAR and SAE J1850.
But, from my understanding, 0x8E — binary: (1)-1000-1110 — actually is not the same as x⁸ + x⁴ + x³ + x² + 1;
0x8E is the reversed — LSB-first — form of 0x71  (1)-0111-0001, which corresponds to the polynomial x⁸ + x⁶ + x⁵ + x⁴ + 1, and is a reciprocal form of the CRC-8-SAE polynomial 0x1D, but with similar properties:

So if the polynomial actually is 0x8E, then for calculating the CRC-8 of the safety byte the reversed, LSB first, algorithm would have to be used. Is this correct?
If yes, then it possibly also applies to the CRC-3, because two CRC sums used in the same HSLI frame are likely implemented in the same fashion. This could mean that the polynomial to be used when calculating the CRC-3 would be 0x6 ("reversed"), or 0x5 ("reversed reciprocal"), but not 0x3. Which one is actually used by the TLD7002-16ES?

The CRC-8 of SAEJ1850, by the way, also defines a final XOR step, where 0xFF is XOR'ed into the crc value. I suppose, since the datasheet of the TLD7002-16ES does not mention this, this final step of the original SAEJ1850 definition does not need to be performed in case of HSLI?

It could probably be helpful, if a table of example CRC results for various input values would be included in the datasheet, similarly as it is done in the Autosar document; this way users could perform a test for plausibility of their crc implementations, before sending actual requests to the TLD7002. 

Regards,
Michael

 

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At 9V, the PWM driver will see the LED flicker that can be recognized by human eyes. When testing the waveform with the oscilloscope, it is found that the power supply voltage is forcibly pulled down by a few tenths of a volt. When the voltage is adjusted to 10V or above, the flicker disappears, but the phenomenon of forcibly pulling down the power supply detected by the oscilloscope still exists.

This phenomenon is especially obvious when multiple devices supply power at the same time. The waveform of tail point is as follows. Please help analyze whether this phenomenon is normal and what causes it.

 

 

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TLD5099EP  can be used with 3.3 V and 5 V microcontrollers without any problems. The EN/PWMI pin thresholds are designed to be compliant with both uC standards. 

For more information please visit our LITIX Power webpage and the TLD5099EP webpage.

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OUT_SET pin mirrors the IIN_SET current set by the external resistor RSET. Any change on the IIN_SET current will be mirrored to the OUT_SET pin.

PWM may be applied in two different ways in an application.

PWM via PWMI-pin
When PWM is applied via PWM-pin of the first IC only, this will not be propagated to the second and subsequent ICs. Reason is that the IN_SET current is not affected by the PWMI-pin status and will remain stable during the deactivation phase of the PWM. Therefore, the second IC channels will be constantly active while the first IC channel will operate in PWM.
In this case, we have to apply the same PWM to the PWMI-pin of all the ICs in the application.

PWM via IN_SET-pin
When PWM is applied via IN_SET pin of the first IC only, this will be propagated to the second and subsequent ICs. IN_SET current will change according to the PWM and those changes will be mirrored to the OUT_SET pin and therefore will be propagated to the second IC.

IN_SET to OUT_SET activation and deactivation delay times have to be considered for a synchronized result (P_6.6.10, P_6.6.11).


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SEPIC DC-DC converter needs two inductors to properly work. The two inductors can be wrapped on the same core (coupled inductors) or on two separated cores (uncoupled inductors).

SEPIC using coupled inductors shows

• higher efficiency due to reduced magnetic core losses
  
• reduces PCB area because it needs the space for only one magnetic component
  
• simpler compensation due to simple transfer function
  

On the other hand SEPIC using uncoupled inductors can benefit of components coming from a wider inductance selection thus proving flexibility in the system design.

To see how to use LITIX Power DC-DC controller in SEPIC topology, please have a look at the LITIX Power webpage Show Less