Part Number: BQ25890 Tool/software: WEBENCH® Design Tools Each reference design USES U2's LDO, VBUS to 3.3v, why?
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Forum Post: WEBENCH® Tools/BQ25890: VBUS to 3.3v
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Forum Post: WEBENCH® Tools/BQ25890: DPS
Part Number: BQ25890 Tool/software: WEBENCH® Design Tools Is I2C directly connected to DPS? Do I need to add pull? I2C how to control the charging state.
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Forum Post: WEBENCH® Tools/BQ25890: USB
Part Number: BQ25890 Tool/software: WEBENCH® Design Tools Do USB D+ and D- connect directly to DPS? How does USB control the charging state?
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Forum Post: LM25141-Q1: Inductor and capacitor design
Part Number: LM25141-Q1 Dear, I have some questions about the application information in the datasheet. 1.When designing the inductor using the equation below, why does the duty lose or ignored? 2.When designing the output capacitor using the equation below, what does the Istep mean and what does the equation come from? 3.When i want to add the frequency dithering, how to choose the modulation frequency? Thanks . Wenyi
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Forum Post: WEBENCH® Tools/BQ25890: DSM
Part Number: BQ25890 Tool/software: WEBENCH® Design Tools Is TS internal resistance test BQ25890, or does it need to be connected to DSM control/test?
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Forum Post: WEBENCH® Tools/BQ25890: PMID
Part Number: BQ25890 Tool/software: WEBENCH® Design Tools Why do you have PMID output and SYS output? What are the differences?
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Forum Post: WEBENCH® Tools/BQ25890: PG
Part Number: BQ25890 Tool/software: WEBENCH® Design Tools LED lamp status and usage with D- connection? How do STAR and PG light up?
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Forum Post: LMG1205: lmg1205
Part Number: LMG1205 The module lmg 1205, used in a DC-DC module, malfuntions in the level of PCB. The phenomenon is that the supply voltage of both the lmg1205 and the input cannot be up to the expected values. In my design, the input voltage is 84V, but it turns out only 0.6~0.9V able to add to the circuit. What mistakes may I had made? The PCB or the circuit itself that has been stimulated in LT spice several times? It is improtant to note that during the stimulation, there are some points when the speed of stimulation gets really slowly, but eventually the output voltage obtain the ideal value. If these ponits account for the failure?
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Forum Post: WEBENCH® Tools/BQ25890: SYS
Part Number: BQ25890 Tool/software: WEBENCH® Design Tools 1. How to modify SYS output, such as 4.5v output? 2. How to modify the charging current and cut-off voltage?
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Forum Post: BQ25606: Sleep mode
Part Number: BQ25606 Hi TI, How can I put the charger into sleep mode? If I need sleep mode(shipping mode), should I use BQ25601? I need this mode to minimize leakage current from battery.
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Forum Post: BQ27542-G1: BQ27542-G1 current reading error
Part Number: BQ27542-G1 As the picture show, why my MCU can read 65324 mA, the reading seems to have overflowed. And my I2C communication rate is 400KHZ.
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Forum Post: TPS22976: Inquiry on the suitable supply voltage to the chip.
Part Number: TPS22976 Hi, I would like to ask if I can supply 1.8V to Vbias (PIN 4) of TPS22976. Based on the datasheet in pin functions table, the recommended voltage range is 2.5V to 5.7V. In the absolute maximum ratings table, the minimum and maximum Vbias voltage is -0.3V and 6V respectively. Will the chip able to operate at 1.8V? Thanks in advance. Any suggestion or advice is much appreciated.
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Forum Post: BQ25601: Changing minimum battery voltage when SYS will shut down.
Part Number: BQ25601 Dear Team, I'm experimenting with a BQ25601 charger IC to be suitable for our application. One of the problems I'm experiencing right now is to prevent the output voltage to fall below 3.5V (the cellular radio module depending on the board variant needs 3.2 or 3.5V) I'm really flexible with the solutions, but trying to use as much as possible from what I have right now. I came up with the following: 1) step up the voltage on VSYS by external DC-DC converter (the simplest one) 2) shut down the SYS when it falls below 3.5V. Does BQ25601 allow for changing the voltage at which SYS shuts down? Right now on my test setup it was around 2.5V. 3) use another charger IC, with either an output step up converter, or, if 2 is not applicable with changeable shutdown voltage. Would you recommend some part with that kind of feature as a replacement? More background on our application can be found here: https://e2e.ti.com/support/power-management/f/196/t/820080 and https://e2e.ti.com/support/power-management/f/196/t/818365 Best regards, Krzysztof Kondratowicz.
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Forum Post: TPS2373: VC_IN connection
Part Number: TPS2373 Hello If customer do not connect to Xfmer aux bias supply to VC_IN due to it is module. How to provide and what voltage to VC_IN of TPS2373? Could pull VDD voltage input to LDO then transfer bias volatge to VC_IN pin? Has any comments for it?Thank you. BR Patrick
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Forum Post: TPS53515: Frequency instability issue at Fsw=600KHz
Part Number: TPS53515 Vin=12V, Vout=0.8V/8A application, Cin=44uF and Cout=350PF. The detail schematic as follows: When Fsw=600KHZ, the frequency isn't satble. The wave for SW point is in the below: But the circuit works well with Fsw=400KHZ, please find the wave for SW point and BODE in the two following picture: I wonder what cause this phenomena, and how can I fix this issue by adjusting the component's parameter? Thanks.
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Forum Post: UCD7138: Gate Driver output stage
Part Number: UCD7138 The datasheet said the NOMS and voltage boost can help to deliver the highest source current when turning on the MOS. But I have confusion about this. Why do the NMOS in parallel with PMOS deliver higher source current? And what role does the voltage boost play? Please explain this in detail, thanks.
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Forum Post: BQ24080: Deep discharge
Part Number: BQ24080 The deep discharge of a LiPo batterypack with integrated PCM does not recover with the BQ24080, but instead shows strange sawtooth discharge behavior. We slowly discharged a LiPo battery pack with integrated PCM. Once the battery was discharged, we enabled the charger, but we are unable to reinstate the battery voltage above 3V.. Has anyone seen this before and have an explanation/solution please? (see images)
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Forum Post: BQ35100: What mode does the Energizer L91 chemistry in bqStudio allow (SOH or EOS)?
Part Number: BQ35100 The bqStudio seems to have the Energizer L91 chemistry available to program. if I program it into the bq35100 , which of the SOH or EOS modes will work better with it? Regards
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Forum Post: UCC21520: Drive capabilities: External components: Bootstrap Diode, VDDA and VDDB capacitors, Ron Resistor
Part Number: UCC21520 I use the UCC21520 to drive an IGBT which has 4.4nF input capacitance, 10 Ohm Integrated Gate resistor. I used 7.5 to 10 ohm serial reistor to directly drive the IGBT gate. I observe that only when I use 0R (ZERO!) resistor, I get satisfying Switch- ON waveform (20nSec). The turn off waveform is also improved at 0 Ohm resistor (5nSec). The resistor slows down switch ON time to 100nS or more. I ask whether a 0R resistor is still a correct design, without over-stressing the UCC21520. I calculated my peak source and sink current, with resistor = 0R , and I am well below 2A, which looks fine to me. My design: I don't have a bootrap diode. My VDDA cap is 0.1uF , VDDB cap is 0.1uF and 1uF. VCC is 5V, VDDA and VSSA is 16v and -9v while VDDB and VSSB is 16v and -16v, respectively. No Rgs resistor. Thanks for your support!
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Forum Post: TPS53622: sequencing
Part Number: TPS53622 Hi Team, As per application schematics, enable of power stage (CSD95496QVM) controlled by ASKIP# pin of TPS53622A. Is ASKIP and BSKIP pin able to control the power stages without AVR_EN & BVR_RN? Is AKSIP and BSKIP pin active functionality once 3.3V rail up? Can you please help with your comments. Regards, Shinu Mathew.
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