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Hi,
I'd like to use UCC25600 controller for a low voltage LLC resonant converter application with input 12V and output 6V.
would you please share the part number of the optocoupler used to create isolation between output and RT pin? or please provide the optocoupler specification.
Could you also explain why we need shunt regulator (TL431)?
Hi Ardeshir,
The opto-coupler part number from the UCC25600EVM is H11AB17A..We've used VO618A in other designs as well.
The shunt regulator acts as an error amplifier that will adjust the amount of current in the opto-coupler to achieve regulation of the output.
Best Regards,
Ben Lough
Hi Ben,
Thank you for your input.
I am currently trying to run simulation with UCC25600; but, it appears that I do not get PWM from GD1 and GD2.
I ran a simulation weeks ago using TINA TI with the same circuit shown in attached and I was able to get desired output from converter.
I downloaded PSpice model of this controller from TI website; and it appears as follow - would you confirm if this Spice model accurate?
Please find below - the model in "txt"
UCC25600
*****************************************************************************
* (C) Copyright 2013 Texas Instruments Incorporated. All rights reserved.
*****************************************************************************
** This model is designed as an aid for customers of Texas Instruments.
** TI and its licensors and suppliers make no warranties, either expressed
** or implied, with respect to this model, including the warranties of
** merchantability or fitness for a particular purpose. The model is
** provided solely on an "as is" basis. The entire risk as to its quality
** and performance is with the customer
*****************************************************************************
*
** Released by: WEBENCH Design Center, Texas Instruments Inc.
* Part: UCC25600
* Date: 25SEP2013
* Model Type: Transient
* Simulator: PSPICE
* Simulator Version: 16.2.0.p001
* EVM Order Number: EVM (HPA341)
* EVM Users Guide: SLUU361April 2009
* Datasheet: SLUS846B SEPTEMBER 2008REVISED JULY 2011
*
* Model Version: Final 1.00
*
*****************************************************************************
*
* Updates:
*
* Final 1.00
* Release to Web
*
*****************************************************************************
*
* Model Usage Notes:
*
* 1. The following features have been modeled
* a. Switching Frequency v/s RT resistor
* b. Deadtime v/s DT resistor
* 2. Figure 7, 8, 9, 10, 11 from the datasheet are not modeled (Values at 25C are considered).
*
*****************************************************************************
.SUBCKT UCC25600_TRANS DT OC RT SS VCC GD1 GD2 GND
$CDNENCSTART
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$CDNENCFINISH
.ENDS UCC25600_TRANS
Hi Ardeshir,
What is the voltage you see on the RT and DT pins?
Best Regards,
Ben Lough
Is the Pspice model okay? is it jumbled? please see below in bolded.
SUBCKT UCC25600_TRANS DT OC RT SS VCC GD1 GD2 GND
$CDNENCSTART
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$CDNENCFINISH
.ENDS UCC25600_TRANS
Hi Ardeshir,
The UCC25600 spice model looks this way because it is an encrypted model.
Check how much current is getting pulled out of the RT pin. If too much current is pulled out of the pin, the controller will not switch.
Best Regards,
Ben Lough
Yes, the current out of RT pin is close to 10mA (higher than what specified on the spec sheet)
Is it related to soft start pin? For now I'm just applying 5Vdc to SS pin.
btw, I have done open loop simulation with pulse generators and things work as expected. Just need to make the controller work properly.
Thank you,
Ardy
Hi Ardeshir,
Try disconnecting the opto-coupler for now. Perhaps something is not quite right there. See if RT pin becomes something more reasonable when R10 is removed.
Best Regards,
Ben Lough
I did three experiments to see if controller works:
1. completely disabled feedback circuit and instead added a current source of 3.5mA to make controller to pulse at fixed frequency and open loop.
The GD1 and GD2 are still not producing PWM but there is a output voltage (in green) for few microsecond.
2. I removed the entire FB circuit and added a 3.3V DC supply to R10 and removed the DC supply on SS pin:
Still no PWM; but, RT current dropped to 1.5mA.
3. If I remove R10 and the optocoupler, the RT current is even higher -12mA
Hi Ardeshir,
Sorry, I don't think your images made it into your post. Could you try posting them again?
Best Regards,
Ben Lough
Hi Ardeshir,
As a side comment, it does appear the PNPs are upside down in the totem pole drive structures. I would suggest to flip them to get the right connections.
Best Regards,
Ben Lough
Sorry - I noticed it doesn't uploaded images - here are the images for each trial:
I did three experiments to see if controller works:
1. completely disabled feedback circuit and instead added a current source of 3.5mA to make controller to pulse at fixed frequency and open loop.
The GD1 and GD2 are still not producing PWM but there is a output voltage (in green) for few microsecond.
2. I removed the entire FB circuit and added a 3.3V DC supply to R10 and removed the DC supply on SS pin:
I did three experiments to see if controller works:
3. If I remove R10 and the optocoupler, the RT current is even higher -12mA
Hi Ben,
I forgot to mention that I have already simulated the same schematic on TINA TI with no problem and I am able to get desired output with ZVS.
This is why I thought maybe something is wrong with the PSpice model.
Please see images below:
What other resonant controller do you recommend from TI? I have looked at UCC256303; but, there is no PSpice model available.
Regards,
Ardy
Hi Ben,
I was able to make the controller functional - I made changes to RT1 and RT2 resistors and removed the BJTs and the controller now works. I initially used the BJT per reference design in the datasheet. Can you please explain why it's necessary to have BJTs as part of gate drive circuit?
Would you please provide LM293AD spice model? from the website, it doesn't appear that the file I downloaded is a .lib or .olb file.
Regards,
Ardy
Hi Ardeshir,
The BJT structure is just a totem pole gate driver. it increases the current driving capability of the gate signals going to the gate drive transformer. The totem pole driver is not explicitly needed. You may also pair UCC25600 to a half bridge driver such as UCC27714. You can refer to PMP20694 as a reference.
Best Regards,
Ben Lough
