Hi Juergen, Can we quickly talk a little bit offline? I find the problem and I can chare. Please find my name and connect webex. Regards, Itoh
↧
Forum post: RE: WEBENCH® Tools/TPS62810-Q1: TPS62810-Q1 Webench
↧
Forum post: RE: BQ40Z50-R2: smbus/i2c
HI Ben Sorry If I'm late to reply. In my case the SMBUS failed very randomly, sometimes after few minutes others after hours. Unlikely you I didn't have any load connected: I just polled some registers every seconds. I used the evalkit of TEXAS and I was connected to it with an STM32. Now, when the communication fails I re-initialize my I2C. I don't know if this have definitely solved the problem but I never had a stuck (at least up to now: I test for several days). Anyway I noticed that sometimes (very rarely to tell the truth) even the BqStudio receive a NACK from the evalkit. If I can help you, don't hesitate to ask. I will be glad to reply for what I can: it's just a couple of month that I'm engaged with this project. Bye Marco
↧
↧
Forum post: RE: BQ40Z80: How to get gauge up and running?
Hi Kang Kang For now I only use the basic protections(CUV,COV). For testing I controll the DSG mosfet over bqStudio. As you can see on the screenshot it is currently in OFF, but there is still some reamining Vgs on the Q202(2V). This is the memory file: https://gofile.io/?c=pPWiem Thanks a lot for the support. Regards André Krummenacher
↧
Forum post: RE: LM5166: LM5166Y Vout regulation
Hi, 1. The "Rising" and "Falling" mean if the voltage is OVER or UNDER the line, it triggers the threshold. 2. 3.29V is on the range 3.23V - 3.37V, it's resonable.
↧
Forum post: RE: BQ27530EVM: Data flash writing fails at verifying if battery isn't connected.
Hello Kang, The Vcc of the gauge is rock solid at 2.5V. I sampled it with an oscilloscope. So, these can't be the problem. And the CRC is computed by the bqStudio program. Take a look at the attached print screens. I've used the tab where I can modify the data flash without worrying about computing CRC. And the same data flash write operation is successful if I connect a battery. The rest of the system remains unchanged. So, which is the problem? Why writing in the data flash isn't possible if a battery isn't attached? I haven't seen any information on the datasheet about this behavior. Regards, Alexandru Petrescu
↧
↧
Forum post: RE: TPS62125: How to use Power Good (PG) to implement Low Battery indicator
Thank you John for the suggestion. I will add TPS3710. Best regards, Mauro
↧
Forum post: RE: UCD74120: Circuit Design UCD74120 and for UCD9244EP.
Hi Binayak, Can you consider other solutions for this application, such as TPS40322, TPS40422 or TPS40428? We don't have much resource to support UCD controller. Sorry about it. The parts I recommended are easy to use and low cost. Thanks Qian
↧
Forum post: RE: UCC2897A: Incorporating Active-Clamp Technology to Maximize Efficiency in Flyback and Forward Designs
Hello, Unfortunately, I was unable to find this paper on the web, may you please attach a pdf version of this paper for my understanding. Regards, Sonal
↧
Forum post: RE: UCC28019A: Non-Sinusoidal Current and abnormal duty cycle at full load.
Hello Jeff, The UCC28019A (and also the UCC28180) has a non-linear current amplifier whose gain is dependent M1,M2 coefficients controlled by the voltage error amplifier. You can see a block schematic of this in Section 7.2 of the data sheet. M1 is the current loop gain and M2 is the ramp slope. You can use equation 76 to calculate the M1M2 product. You can then calculate the value of M1 when the power demand is greatest. If M1 is too high the current amplifier will saturate and that is what is occurring in your application. The current amplifier saturates at a value of ICOMP = 5V The only way to prevent saturation is to lower the ISENSE signal and this means reducing the RSENSE resistor value. If RSENSE is set too high you will get a current waveform that looks like this : Regards John
↧
↧
Forum post: RE: UCC2805-Q1: UCC2805-Q1: OVC
Hello Nobukazu Tsukiji, That is not correct. You can see on the data sheet that the error amplifier is characterised at values of COMP = 2.5V, 2V and 1V COMP and CS are independent signals. I am sorry if I cannot explain this in any simpler terms Regards John
↧
Forum post: LM5166: Swicthing Frequency with COT mode
Part Number: LM5166 Hi, Would you response below my question ? [Back Ground] Currently, I am designing 3.3V non-isolated regulator with LM5166YDRCR(COT mode). Then, I have simulated with LT spice to confrim swicthing behavior.(Spice Model "LM5166_TRANS.lib " that is provided TI web site was used.) But , Observed switching frequency(SW pin) is 114.7KHz in spicte of Rt = 39.4kohm(According to foumula (4) in datasheet, It should be 478kHz ). [Schematic] Please see attached file. [Question] 1) Why is swicthing frequecy 114.7 kHz, not 478 kHz ? 2) Would you provide foumula to calculate swicthing frequency under this condition ? It is urgently item for me. So, Would you please provide response as soon as possible ?
↧
Forum post: RE: LM5030: if Vin=12V, can this part works?
Hello Yuan, If you think you are correct then I suggest you try it and see what happens. Let me know how you get on. Regards John
↧
Forum post: RE: TPS794: input 5V and short to output
Hi Andrew, This will have no issue. Thanks,
↧
↧
Forum post: RE: UCC28180: UCC28180 for DC120V to DC400V-435V ( output power 240W ) question?
Hello Prarinya, 120V peak is equivalent to 85V rms So use 85V rms in the calculator. If you have further questions please open a new thread. Regards John
↧
Forum post: RE: TPS62130A: Regulator not regulating to correct voltage, only to 1/2 of output.
Mike, I am going to close this thread as there is a duplicate email string going.
↧
Forum post: RE: TPS92692-Q1: Device does not response with a DC LOAD in constant current or constant resistor mode
Hi Vaheh, You will need to communicate with the designer to figure out the best way to test their circuit. As I mentioned above, resistors is a totally different load then the LED and the compensation can be different. Another thing is as a boost regulator, Vout has to be greater than Vin. Thanks Tuan
↧
Forum post: UCC21225A: output has no change
Part Number: UCC21225A Hi Team, Here is a question from customer. When there is PWM on INA/INB, OUTA and OUTB keep high and no change. In customer's application, pin4 is connected to 3.3V, pin7 is floating. Is it OK? pin4 and pin7 are connected internally, so it seems OK. DISABLE is connected to GND, DT is floating, is it OK? From datasheet, it seems OK. VDDA is 120V, VSSA is 110V, VDDB is 12V, VSSB is GND. Please kindly add your comments on possible reasons. Thanks. BRs Given
↧
↧
Forum post: RE: TPS92692-Q1: Device does not response with a DC LOAD in constant current or constant resistor mode
Thank you Tuan, I am in contact with the designer. Regarding the load, we are supposed to use a constant current (1.15) DC load. Does it make sense? Vaheh
↧
Forum post: RE: TPS720: VBIAS connection
Hi Matsunaga-san, Figure 10, suggests that this is OK. The data is for 3.3V OUT , but this in an N-Channel FET so I would suspect the data would be similar if V OUT is 1.8V: Of course, this data only looks better if the load current is lower than 350mA. I hope this helps.
↧
Forum post: RE: TPS2388: Misjudgment PD plug in
Jamie, Before I assign this thread to an Applications Engineer, I want to check if this question might also be related to this other E2E thread submitted by the Wintech distributor FAE --> https://e2e.ti.com/support/power-management/f/196/t/864444 . Would you please check it and comment? Thank you for your local support,
↧