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LMG1020: LMG1020
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TPS92692: OPEN CIRCUIT PROTECTION
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LM5122-Q1: Power management forum
Part Number:LM5122-Q1
Hi team,
I want to do a customize simulation through WEBENCH, but i can't set the switching frequency to the point(450KHz) i want to use. Could you please kindly give me some support on this issue. If it is can't be set, could you please also kindly help to support the Simplis module/file if you have one.Thank you so much.
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TPS92692: Specifiction of PWM pin
Part Number:TPS92692
I want to use external PWM signal for LED dimming. I am not able to find specification of PWM pin on data sheet. Can you please share specification of PWM pin for feeding external pwm signal?
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BQ24161: solar panel
Part Number:BQ24161
Will it work to connect a solar panel to the IN pin of the BQ2416x.
Thanks in advance
Thomas
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TPS650864: Feedback loop
Part Number:TPS650864
Hi,
There are FBVOUT pins for every buck convereters (BUCK1-BUCK6) which are connected after output inductor. While doing Power Integrity DC drop analysis , can we consider source point after the inductor. Otherwise, we have to consider the DC resistance values of that series output inductor? we want to know whether this TPS65086401RSKT will compensate the voltage drop occurring across the inductor as the feedback is connected after the inductor.
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BQ24250: Battery cut-off voltage
Part Number:BQ24250
Dear all,
I have a question about the BQ24250 when the battery reached the cut off voltage after a long time without activity (0V).
In this case, when I connect 5V on BQ24250, the charging sequence doesn't start and Vbat stays at 0V.
So, why the battery is not charging?
Note when battery level is at least 3V, I have no issue to charge the battery. This issue is only when the battery reaches the cut off voltage.
Thanks
Regards,
Damien
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TINA/Spice/LM5085: Gate Drive MAX current. Spec. versus model
Part Number:LM5085
Tool/software:TINA-TI or Spice Models
Hi,
Whilst busy inside simulations using LM5085 I noticed that I was seeing significantly higher switching losses from the power FET and investigated. I have generated a few questions.
Q1. The Datasheet for the LM5085 states that the gate drive is capable of ~1.5A and has an output Resistace of 2.3ohm (@500mA). However I noticed that the Spice model shows gate currents of only 150mA. I tested this both whilst driving the FET and to be sure I strapped the gate output to Vin through a very small resistor to see what current the gate pin would sink when the converter attempted to start. ~154mA. This is much much lower than expected. Can anyone explain?
In an attempt to see how that converter would perform with more reasonable gate currents, I followed the gate output with a BJT push pull pair between Vin and Vcc, using some high speed BJTs, the affect was dramatic. The gate drive current on the active side of the PP pair jumped as expected to >1.5A peak. Switching times significantly improved and the efficiency jumped up 'a lot'.
The lower leg of the PP pair was connected to Vcc, therefore this 1.5A was being sunk into the Vcc pin.
Q2. Would the real IC actually allow such currents to be sunk into the Vcc pin? The datasheet states Vcc Current limit at 40mA, but it does not state sink or source. I strongly assume this configuration would be invalid.
In the process of doing this I noted that the datasheet states, "The regulator is disabled when the LM5085 is shutdown using the RT pin". When I shutdown the model in this way the Vcc pin stays nailed at Vin-8V.
Q3. I assume that with the real IC, when in shutdown, Vcc would float up to Vin rapidly. Can you confirm this?
Finally can you comment on the idea of following the gate output with a higher power driver. like I described. I'm hoping that this is just not necessary, but the drive I'm getting from the Spice model is just not enough.
I am designing a 60V in....42-60V current regulated converter, capable of 8A output at any voltage between 42-60V. That's around 400W as a system. Looking at the datasheet it is almost impossible to predict efficiency, but using simulations I am surprised at the results. I have designed the converter to run at around 60Khz, in an attempt to reduce switching losses, which as expected predominate. Even so, with the LM5085 as the sole gate driver I am seeing between 10-20W power dissipation in the PFET, depending on the particular FET I use. When I drive the gate with an auxiliary driver I can reduce this power loss to < 3W. This makes a huge difference to the package type and heat-sink requirements of the PFET.
This is an awful lot of simulation and not much reality, but I would appreciate any feedback on my questions and comments on the application.
Many thanks
Aidan
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TPS561201: layout guidelines for TPS561201DDCR , please check teh SW node path
Part Number:TPS561201
Hi TI Suport
Please review the attached SCH and Layout of our attached partial data.( to better avoid any RE and CE failure)
Thanks
Kunal Barot
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BQ27425EVM-G2A: data block memory
Part Number:BQ27425EVM-G2A
I encountered a miss match between data sheet and actual data block structure.
In the data sheet data block subclass 82 shows like this:
Actual reading from device looks like this:
It seems that there is a bias of 1 byte in offsets.
Update status (0x04) should be at offset #2 but actually is located at offset # 1.
Any ideas?
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TPS23756: want to check what's the purpose of the D17、R18、C26 of the TPS23756
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UCC5310: UCC5310
Part Number:UCC5310
Hi,
Kindly suggest Single-Channel Isolated Gate Driver IC to drive Low side MOSFET with following specifications:
1. Minimum 3KV isolation
2. Automotive/RoHS
3. Temp (-40 to 105/125 degree)
Thanks,
Priyanka
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LM5060-Q1: Higher Input Voltage
Part Number:LM5060-Q1
Dear Team,
I am looking for hotswap controller up to 100V and AEC Q-100.
The customer may use LTC4380, even it is not AEC Q-100 device.
Please help on suggest suitable solution.
BR
Kevin
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BQ28Z610: How to recover a gauge that has failed an update
Part Number:BQ28Z610
Hello, guys!
I managed to flash a bq.fs image from Linux to BQ28Z610 by using these components:
- A modified bqz file that enables Golden Image generation for v0.20 (sent to me in a PM)
- i2c-flashstream Perl script to transform bqfs to a C header file
- tibms Github repo with the bq28z610 driver
I had conducted a series of experiments w/o bumping into any issues until, well, I did. This was due to some I2C noise on the line.This led to the gauge responding on ROM mode address (0x0b).
It NAK's all reads and writes on this address, though. bqStudio also cannot help in this situation. On a Logic analyser log I see a series of NAKs from 0x16 (0x0b << 1).
I'm wondering how can I recover the device from this state.
Sending 0x0x 0x11 to 0x0b to exit the ROM mode doesn't work as I said above. SMBUS recovery using a bq24xxx.bqz and "Advanced SMBUS communication tab" described in another post on this forum also fails.
As the device still responds on 0x0b I think that there's something left to try before admitting that this is a lost cause and soldering a new gauge.
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BQ24259: how to configure PSEL and OTG?
Part Number:BQ24259
Hi, BQ24259 will decide the input current limit by PSEL and OTG pin.
Take USB 2.0 as an example, it has only 4 signal, VCC, D+, D- and GND. I guess non of them is to be connected to PSEL or OTG.
When I draw the schematic BQ24259, how should I set PSEL and OTG so that the input current limit can change with different things I insert?
For example if I insert an adaptor source with 3A, how will the adaptor set PSEL low? Will every adaptor follow the rule that it will pull PSEL low?
And what's the name of the rule?
Datasheet example connect PSEL to PHY, but I don't understand what it means.
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LM5176: LM5176
Part Number:LM5176
I am using IC LM5176 for constant current application. Please give your suggestions about my layout consideration. Will there be any effect of bootstrapping capacitance? I have attached the file of my PCB layout.(Please visit the site to view this file)
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LMZM33606: Issue with under voltage lockout on the DCDC weird buzzing noise and leaking voltage/current when it suppose to stop
Part Number:LMZM33606
Hello,
I have been having some issues with the under voltage lockout to immediately stop with when it reaches 15V using a battery.
To quicken up my testing process I used a PSU to simulate a battery Voltage and amps.
The issue happens when it reaches a close to 15V, when it reaches 15.4V the DCDC trickles power through (on the other end I have a 12V DC Pump)
But raising the voltage up after 15.4V still does the same until I reach 15.8V. During the time when it is trickling the DCDC is making a weird buzzing noise.
Please can I have help for making the DCDC to stop at 15V approx. without any of the other issues
I have attached the schematic.
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about BQ76PL455A question
I want to get 16 cell voltage and two temperature. I configure in the follow sentence:
nSent = WriteReg(0, 13, 0x10, 1, FRMWRT_SGL_NR); // set number of cells to 16
nSent = WriteReg(0, 3, 0xFFFF0300, 4, FRMWRT_SGL_NR); // select all cell, AUX channels 0 and 1
nSent = WriteReg(0, 2, 0x01, 1, FRMWRT_SGL_NR); // send sync sample command
nSent = WaitRespFrame(bFrame, 39, 0); // 36 bytes data + packet header + CRC, 0ms timeout
in the reponse message bFrame,i find that the 16 cell voltage data is right,but the aux 0 is not right.
why does this happen?can you tell me the reason? I test the voltage of aux0 is 3.5v. aux 1 is disconnect.
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LMG1205: Automotive qualification of GaN drivers
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UCC2897A: QFN Layout for PGND and GND
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