Hi Team,
Why can't find TPS53312 datasheet on TI web side?
Can you tell me where I can download it? Thanks.
Best regards,
Ronnie Lin
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can't find TPS53312 datasheet
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AC-DC power supply mosfet mounting clarification
Hi There,
I could see many power supply design from TI having mosfet in this kind of orientation (image attached below). I hope this is for better clearance routing. My Question is if it going for production how they will solder this thing in the fast manner. Whether any factory custom available for the kind of solution or this need be done from our side like manual soldering. Please advise
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BQ24610: BQ24610 have the function of monitoring the battery voltage and controlling the output current of the battery port of the main board?
Part Number:BQ24610
1. Does the charging management chip have the function of monitoring the battery voltage and controlling the output current of the battery port of the main board? If so, what is the monitored voltage?
2. When the battery is under 12.7v in the over-discharge state, connect it to the external power supply, charge it for a while, then the motherboard will not charge the battery, and the charging current drops to 0, so that it cannot be charged.
Any sugguestion？many thanks；
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LM2766: LM2766 : Recommend smaller diode than MBR0520LT1 ?
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REF3130: Question of REF3130 Output voltage ?
Part Number:REF3130
Dear Pro，
The output voltage of some chips is inaccurate.See the figure below for the outsourcing circuit of the voltage reference chip: 3.3VDC input, and the voltage of 3.0VDC is generated as the reference voltage of the single-chip ADC.
The input voltage of 3.3v is also stable and there is no problem in the power supply voltage for chips such as SCM /SDRAM.But the output reference of some chip is not accurate.(at present, 40 boards have been tested, and 3 output benchmarks are inaccurate)
I conducted a separate electrification test on the abnormal REF3130AIDBZR chip and found that its output voltage changed with the input voltage.
When the power supply is 3.3v, the no-load output voltage is about 1.9v.If connected to the MCU, the output voltage becomes about 1.5v;
As the supply voltage increases, so does the output.
Please help me analyze what causes this kind of problem.I checked the screen printing of the device, and the specification is correct.
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TPS54116-Q1: Blockwise Transfer function to find the stability of device
Part Number:TPS54116-Q1
Hi,
For TPS54116-Q1 stability TI gave some excel sheet to find the gain and phase margin. But to cross check that we need to do bode plots. For that we need openloop Transfer function of the compensation network. Few questions for TI
1. What Transfer function did you used to plot the curves in excel sheet?
2. Can we get the decoded transfer function block wise? For example, Error Amplifier Transfer function, Voltage divider TF and so on.
Regards,
Soumya
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TPS54622: negative voltage on PH during start up. TPS54622
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BQ76PL455A: Design for EMI and EMC noise
Part Number:BQ76PL455A
There is an app note "SLUA776" on your web.
And it explains about X and Y capacitor and EMI suppression filters.
Where should we put these components? Is it on the differential communication line? X and Y capacitor are put on PACK +/- on the app note.
If it is communication line, should we put near the device both lower and higher?
Best Regards,
Kohei Sasaki
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BQ34Z100-G1: Voltage calibration "Cell Voltage correction is beyond allowed range"
Part Number:BQ34Z100-G1
Hi,
I'm trying to use a 12V 2.3Ah Lead-acid battery with the BQ34z100EVM and EV2400.
Following the Step-by-Step Design Procedure in the BQ34Z100-G1 datasheet on page 50.
Step 1:
- Design Capacity: 2300mAh
- Design Energy: 2300mAh * 12V = 27600 mWh
- Cell Charge Voltage Tx-Ty: 2300mV
Step 2:
- LED_Comm Configuration: default
- Alert Configuration: default
- Number of Series Cells: 6
- Pack Configuration: VOLSEL bit set
On the BQ34z100EVM the following jumpers are set:
- J5: >5V
- J2: 16V
- J3: A
- J6: EXT
- I2C: connected
Step 3:
- Voltage Divider: 16000mV
- Flash Update OK Cell Volt: 2800mV * 6 * 5000 / 16000 = 5250 mV ("Value is beyond maximum value defined for parameter")
Then it says "Use the Evaluation Software to calibrate to the applied nominal voltage; for example, 24000 mV."
In bqStudio v1.3.90 I go to Calibration
Tick the Calibrate Voltage box
Fill in 12890mV (measured at BAT+ and BAT-)
Calibrate Gas Gauge
"Calibration - Cell Voltage correction is beyond allowed range."
What am I doing wrong?
Thanks,
Remko
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BQ50002A: Improve efficiency for low power requirements
Part Number:BQ50002A
Hi,
We are using the bq50002A together with the bq500511A as the TX unit in a wireless charging system. On the RX side, we use a bq51003 in combination with a bq25101 to charge a small battery of 60mAh. We noticed that the battery can become quite hot, possibly destroying the battery, if we charge at 1C. We limited the charging current to 0.5C, 30mA, to decrease the power received and minimize heating of the battery. When I did some efficiency measurements, I noticed that the overall system efficiency (USB to battery) is very poor, only around 11%. I noticed in the datasheet of the bq50002A a small graph indicating that the efficiency is indeed very poor at low power.
Are there ways to improve the efficiency significantly for low power, or would you suggest another part that can perform more optimally for such low power requirements?
Thanks!
Wout
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BQ25601: What is the value of VQON?
Part Number:BQ25601
Hi TI,
/QON has been pulled up internally. But I cannot find how much the pull up voltage is. Does this voltage change between with charger and without charger? Also looks like it is pulled up by a diode and a resistor. How much voltage drop it will be? Thanks!
cheers
Fan
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TPS92630-Q1: Using TPS92630-Q1 for indoor Lighting Application
Part Number:TPS92630-Q1
Hi.
My idea is using TPS92630-Q1 for downlight product. I will connect 9 series LED per channel, current each channel is 65mA. The Vled is 2.95V, so I will need ~27V power supply (2.95V x 9).
So please let me know, Does is TPS92630-Q1 compatible for my application?
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UCD3138HSFBEVM-029: how to achieve short-circuit hiccup protection of UCD3138-based full-bridge hard switching power supply
Part Number:UCD3138HSFBEVM-029
Hello，
I recently made a power supply based on the UCD3138's full-bridge hard-switch development board.
I want to achieve snoring protection when the output is shorted. After the short circuit is removed, the power supply automatically starts up normally.
How to design software and hardware?
Is there a corresponding reference document?
Thank you.
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LM36011: IR mode and Flash mode
Part Number:LM36011
Dear all
I have two questions about LM36011 device, please help me to resolve them, thanks a lot.
1. What is difference between IR mode and Flash mode ? I check IR mode use the current value stored in the LED Flash Brightness Register, so I don't know what is the difference between them.
2. As below picture from the datasheet, it said the pulse width must be set greater than 1ms, so I want to know it will be effect the IR mode ? Because the IR mode is " all timing of the IR pulse is externally controlled"
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LM3671: LM3670 / LM3671: Increased quiescent current if EN = (VIN - 1.1V)?
Part Number:LM3671
Hi everyone!
I want to know if the input stage of EN (enable pin) will exhibit an increase in quiescent current consumption if it's voltage is significantly lower than VIN. I have performed an experiment with VIN = 3.6V and EN = 1.5V and this was the threshold where the no-load quiescent current started to get higher. Here is the relevant extract from the datasheet:
This is what I'm actually trying to do:
I am trying to implement a low cost & low power on/off circuit (suggestions for a better circuit most welcome!). If +5V from USB is connected, regulator must be on. If the button is pressed, regulator must also switch on. In both cases, microcontroller must hold the regulator enabled via a GPIO output pin connected to net "+3V3_HOLD". When the microcontroller wants to switch off, it takes +3V3_HOLD low.
+VBAT is connected to a LiPo battery (+3.6V to +4.2V). So when the circuit runs from battery, U5-1 (VIN) = ~4.2V, but U5-3 (EN) = ~3.1V (schottky diode drop over D10). This is a difference of ~1.1V. The datasheet specifies EN Vih threshold for VIN=3.6V, but not for VIN=4.2V and this raises my question regarding the EN pin input stage:
Is the EN pin a regular complementary PMOS - NMOS pair with higher shootthrough current if the gate voltages are in the middle of the supply voltage? Or is it a special circuit that exhibits very low leakage current?
Will my circuit perform well with minimum quiescent current or is there a better alternative?
Thanks in advance,
Pieter
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TPS65218: How to identify Good and Bad TPS65218B1 on assembly board
Part Number:TPS65218
Hello TI
We have assembled around 400 units using TPS65218B1 series PMIC
almost 300+ boards work fine with no problem at all,
On all board, we have the same PMIC TPS65218B1 series
Few PMIC does not work as desired and we measured the temperature around PMIC is 20-25 deg.
Few PMIC board works fine even at 50- 65 Deg.
Now we would like to measure some checkpoints on PMIC, please suggest how to and what to check so that we can identify the bad/abnormal PMIC vs Good PMIC.
We have both PMIC boards (Good and BAD PMIC) but unable to find differences or unable to figure out bad points in bad PMIC,
Our end customer is asking to tell us waveform or impedance or other points in BAD PMIC which is different from Good PMIC.
IN below image Yellow color is VIN_DCDC4 and Green color is output which is Zero
1,2,3 Column we are getting 3.3V output but the last column (4th) is NG means failed, PMIC failed to output 3.3V
IN below
please suggest any clue or checkpoint by which we can figure out the differences
Please reply to my every point mentioned above
Thank you in advance
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TPS2378EVM-105: emi
Part Number:TPS2378EVM-105
team,
any advice the output circuit to reach 2 or 3 kv EMI?
can you provide circuit and EMI testing report?
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TPS2546: STATUS behavior under DCP_AUTO
Part Number:TPS2546
Hi,
I have two questions about STATUS pin under DCP_AUTO mode.
- When CTL1/2/3/ILIM_SEL is configured as "0011" (DCP_AUTO/Power WAKE LIMIT), if a current > IOS_PW (55mA typ) is detected, STATUS should be asserted low. Is there any debounce timing for STATUS to change from high to low at this moment? (For low-to-high scenario, there's a15 sec timing defined.)
- When CTL1/2/3/ILIM_SEL is configured as "0111" (DCP_AUTO/Non Power WAKE LIMIT), ILD is defined as a much higher threshold at 700mA/typ. May we know what kind of application scenario could need such setting? I didn't find an application example in the datasheet.
Thanks!
Antony
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TPS92515HVEVM-749: About IADJ pin
Part Number:TPS92515HVEVM-749
Hello E2E,
I seted the Vadj to 0-V(GND) for stop the ILED completely. However LEDs are lighting.
Please let me know how to stop the ILED. (without shunt-FET using)
Regards,
ACGUY
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TPS54201: Blinking LED
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