Part Number:BQ24610
Hi Sir
I saw TI have a high cell reference design call "bq24610EVM-603>7-Cell, Li-Ion Battery Charger"
May I know what's the function of R3 and R27 ,have any equation could be referenced ?
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BQ24610: bq24610EVM-603 >7-Cell, Li-Ion Battery Charger
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TPS799: TPS79915 load transient response curve
Part Number:TPS799
Hi,
my customer would like to use the TPS799 (TPS79915 variant) in their new project and would like to know what the load transient response is going to look like under the following conditions: Vin = 5V, Vout = 1.5V and load varies between 1 - 5mA.
Some datasheets usually have a curve that describes this behaviour. but in this case the load transient response curve is not present in the datasheet. Could you please share this information if you have it internally.
Regards,
Stani
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LM5117: Output voltage drops after load connection
Part Number:LM5117
(Please visit the site to view this file)Hello,
We have designed a buck converter using LM5117. Below are the specs:
Input voltage : 35V to 48V
Output voltage: 12V/ 3.5A
During testing I found that output voltage is at 12V under no load condition. But when load of 4 ohm is connected it drops down below 1V. Please find attached schematic. Can you please let me know the reason and what modification shall I do in current design?
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BQ27742-G1: TS measurement and protection.
Part Number:BQ27742-G1
The capacity reported by the gauge becomes incorrect. This appears to be the result of the thermistor temperature reading of -39.1 deg C. The initial reason for the negative reading was an open circuit on the battery thermistor connector. After confirming connection, the voltage on the TS pin stays at 0.8V, whereas a working unit with correct temperature pulses between 2.5V and a value dependent upon the thermistor resistance.
This is not the first time we have experienced this problem. Using the default .srec firmware confirms that it is more likely to be a damaged sampling switch on the TS input. Failed open means TS goes to zero, which we have seen before. Failed short goes to 0.8.
Has anyone else had failures like this? Solutions?
TIA
John
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BQ20Z655-R1: BQ20Z655-R1 unchangable register values
Part Number:BQ20Z655-R1
Hi,
In the above thread TI person has said that Flash update OK cell voltage can be set as low as 4500mV. But when I try to change this value it is not letting to set value below 6000mV. How can I set the value lower than 6000mV.
For learning cycle we have to discharge battery till termination voltage. So can termination voltage be less than Flash update OK voltage? Or it has to be greater than Flash update OK voltage?
If we cannot set termination voltage less than flash update ok voltage then for 2 cell application termination voltage will be 3V per cell, will this give proper capacity indication?
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LP8728C-Q1: Current Output
Part Number:LP8728C-Q1
Regarding the output current, is the maximum 1A for each output or all total 4 outputs is 1A Max?
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TPS54560: SMPS Randomly not Regulating
Part Number:TPS54560
The question is, what are the factors that would cause the SMPS not to regulate.
We have a SMPS based on the TPS54560 designed to regulate 26 to 46 VDC to 24 VDC. The system is generally supplied by a 35 VDC wall wart. Recently we have seen a random, but frequent occurrence of what appears to be the SMPS passing the 35 VDC thru with no regulation. We are suspecting the change in level on the 24 VDC bus due to the motors randomly running at 40% faster than normal. We are in the process of setting up systems to monitor the 24 VDC bus to confirm the suspected situation.
Notes:
The 24 VDC bus feeds a 2nd SMPS with a 5 VDC output and is the main driving power for a bank of 24 VDC motors. The 5 VDC SMPS feeds a 3rd 3.3 VDC and supplies charging current to up to 2 smart devices.
Current Draw on the 3.3 VDC: < 100 mA
Current Draw on 5.0 VDC: Generally < 500 mA, max is 3 A
Current Draw on 24 VDC: Generally <150 mA, worst case (motor running/5 VDC max'ed) 1 A
Schematic attached
Any insights are welcome
KS(Please visit the site to view this file)
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LMZ21700: Dropout voltage of LMZ21700 with Vout = 6V
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Packaging Label Barcode Information
I am looking to decipher the information in a 2D barcode. I thought it would be easiest to attach the picture and see if someone can help be figure it out. I can't seem to match everything on the barcode to text on the label. And there was some text information that didn't match what was in the barcode.
START []>06P
SEPARATOR 29
PN 1P TPS78233DDCR
SEPARATOR P
??? 6P
SEPARATOR 29
REV 2P B
QUANTITY Q 3000
V V 0033317
1T 1T 8759540RFC
SEPARATOR P
4W 4W TKY
SEPARATOR 29
DOM D 1807+5
31T 31T 5741052TFG
SEPARATOR P
CSO 20L DLN
SEPARATOR 29
CCO 21L USA
SEPARATOR 29
ASO 22L HNT
SEPARATOR P
ACO 23L THA
SEPARATOR 29
SYMBOLS E G4
SEPARATOR 29
MSL 3Z 1A260CAUNLIM
SEAL DATE ;//;050812
TO L1520
END 7K
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BQ24074: The PIN CHG oscillate at the end of charge.
Part Number:BQ24074
Hi,
I use the BQ24074 for charging a PACK BATTERIE with a Li-ION 3.6V 6500 mAh and a BQ27541.
When the battery is around 80% and higher in charge with USB charger (5V-2A) the pin CHG oscillate with around 1 secondes but is very random.
I have no idea why, someone could help me about this ?
Yours faithfully,
Romain PENOT.
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LM5008: The LM5008 Can't output
Part Number:LM5008
Dear All:
I use the LM5008 to design DC-DC Vin = 60---84V Vout= 12V ，when my system into the sleep mode， the system supply power come from the TPS7A4001，once the sleep mode shutdown, the system power supply come from LM5008，the issue is when I connect the the BAT to LM5008 Vin Pin in active mode， the output voltage is 0 , the LM5008 can't startup, but i cut the FB resistor R65 R66，from 20K,5.1K to 10K , 2.5K the output voltage is normal that is 12V. why cause the result? Can you help to resolve the issue? Thanks~
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LMG1020: october datasheet change, die change?
Part Number:LMG1020
Re the latest datasheet change in October - the NAND gate was changed to AND. Is this correct? Did the die change? The true table suggests not. ie in+ = 1, in- = 0, NAND output would be 0, PMOS on NMOS off. AND gate would mean N/Pmos on/off state would be swapped.
Is the logic the same as the preproduction dies?
Thanks
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BQ27GDK000EVM: GDK - I2C lines
Part Number:BQ27GDK000EVM
Hello,
I am planning to perform a battery characterization using the following EVMs: GDK and BQ27520EVM. After looking at the recommendations of the i2c connections in the GDK and due to the GDK's schematics appear blurred, I have the following questions:
- The BQ27520EVM has pull-up resistors but no jumpers to disable them. Should I desolder them then?
- Do both i2c lines in these boards use the same voltage? I can not tell this from the schematic.
Thanks for your help!
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BQ78350: FW configuration
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BQ25121: LSCTRL PIN and PMIC init.
Part Number:BQ25121
Hi ,
When working with no battery connected to device, only external 5V power.
On Boot, when PMIC is in default state.
If LSCTRL pin connected to PMIC is LOW then i can't configure the PMIC registers, get some I2C error.
if LSCTRL is pin is high all is good.
This happens when there is no battery attached at all to device.
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EV2400: BQstudio and EV2400 Programming script
Part Number:EV2400
Hello all.
I am trying to do a integration using the BQ studio, but i wan tot know if exist a way for execute the BQstudio from an external application or running a script just for execute the programming in an gauge.
Also i found some training videos that mentioned that exist some kind a API for gauge, but i didn't found this API. If someone knows where is this API, I will appreciate it
In advance, thank you for you help and attention.
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UCC2897A: detail turn off process of UCC2897A
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TPS22941: where is TPS22941DCKR producted or assembed？
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BQ25504: Schematic with MPPT to micro controller.
Part Number:BQ25504
I tried with a series PFET (CSD23381F4T) with its source connected to VREF_SAMP, but as soon as the FET turns off, VREF_SAMP drops quickly to zero, probably because of the leakage through the FET. So then I tried with the ADG701 switch which advertises only 10 pA leakage current, but still could not hold the VREF_SAMP voltage constant (leaking slowly). Do you have any suggestion for a sample-and-hold with large hold time (5 seconds) for this situation? The key is probably extremely low leakage components.
Also, the bq25504 datasheet specifies a maximum limit of 11 nF for C_REF. Can you please tell me the reason?
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BQ24232H: Power-up before battery charging commences
Part Number:BQ24232H
Due to startup current to my circuit, is it possible to power up the device's output before commencing battery charging (without external control)?
I thought perhaps connect !CE input pin (charge enable = low) to !PG output (power good = low) - so when the power good pin goes low, charge commences (perhaps using a low pass filter to slow down charge turn-on)?
Also, how much current can the device supply to OUT without battery support?
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