Part Number: TPS61240
Hi Experts,
We are doing an output short test. When shorted voltage output to GND, the output current continues to flow about 80mA.
VIN : 24V
VOUT : 5V
Is this a expected behavior?
Regards,
Uchikoshi
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TPS61240: Output Current under short condition
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TPS560430: Limited current , measured value vs calculated value
Part Number: TPS560430
Hi Experts,
We are measuring the limited current for TPS560430X3FDBR.
When input voltage is below 5V, the measured limited current is larger than calculated value.
When input voltage is above 5V, the measured limited current is smaller than calculated value.
We use below quotation when calculate the limited current.
Could you please provide the information why the measured value is larger than calculated value at Vin < 5V?
Regards,
Uchikoshi
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TPS62510: Min and Max of soft start time and delay from enable to switching
Part Number: TPS62510
Hello,
I have two question about soft start.
Q1
Datasheet shows only typ number of Tss (soft start time) as 750us.
Could you tell me the min and max Tss?
Q2
In 7.4.1 Soft Start description,
“There is a short delay of typically 120 μs between the converter being enabled and switching activity actually starting.”
Could you tell me the min and max of the delay time?
Thanks and best regards,
KM
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TPS2557-Q1: High frequency noise on input pin
Part Number: TPS2557-Q1
Hello,
In case bypass capacitor close to IN pin is open,
will the high frequency noise damage the IC?
if not, what is the effect if High frequency noise is not filtered going to IN pin of the IC?
Thank you and best regards,
Billy
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LMR23630: About LMR23630 Block Diagram
Part Number: LMR23630
Hello,
Could you explain me what the "Precision Enable" and "Zero Cross" are, and how they work functionally?
Also, Could you explain the value of the Rc and Cc in the compensation filter?
How are they calculated and affected for the internal compensation system?
Thank you
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TPS23753A: Passiv POE
Part Number: TPS23753A
Hello!
In our products, we use POE chips from another manufacturer.
When customers connect our products to the Passive POE adapter, it often burns out.
We plan to remake the design on your chip.
Please advise the microcircuit that enabled the Passiv POE adapter. Output voltage 5 V, 10 W.TPS23753A or any other.
Sincerely, Serg.
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LMZ31710: Schematic Verification for power modules of LMZ family
Part Number: LMZ31710
Hi TI team,
I'm using the following regulators of LMZ family in our upcoming board.
LMZ family:
LMZ31710: 1V@10A
LMZ31710: 3.3V@10A
LMZ31710: 3.9V@10A
LMZ21701: 1.8V@1A
LMZ21701: 2.5V@1A
LMZ21701: 1V@1A
LMZ21701: 1.5V@1A
Kindly verify the attached schematics for the above circuits.
Thanks and Regards,
Binayak(Please visit the site to view this file)
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TPSM84A22: Schematic Verification for power modules of TPSM family
Part Number: TPSM84A22
Hi TI team,
I'm using the following regulators of TPSM family in our upcoming board.
TPSM family:
TPSM84A22: 1.9V@10A
TPSM84A22: 1.5V@10A
TPSM84424: 1.8V@4A
TPSM84424: 3.3V@4A
TPSM84424: 1V@4A
TPSM84424: 1.2V@4A
TPSM84424: 2.5V@4A
Kindly verify the attached schematics for the above circuits.
Thanks and Regards,
Binayak
(Please visit the site to view this file)
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TPS7A85: Schematic Verification for regulators of TPS family
Part Number: TPS7A85
Hi TI team,
I'm using the following regulators of TPS family in our upcoming board.
TPS family:
TPS7A85: 1.2V@4A
TPS7A85: 1V@4A
TPS7A91: 1.8V@50mA
TPS51200: 0.75V VTT Termination and Vref
TPS82140: 1.5V@2A
TPS82140: 2.8V@2A
TPS7A89: 3.3V@2A
TPS7A89: 2.5V@2A
TPS82130: 3.3V@3A
Kindly verify the attached schematics for the above circuits.
Thanks and Regards,
Binayak
(Please visit the site to view this file)
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TPS62745: reverse polarity external circuit
Part Number: TPS62745
Hello,
In my circuit, I have two 3V batteries in series as input to my TPS6274. I want to protect it against reverse polarity. Do you have any solution (BOM included) you would suggest for a portable BLE application?
Do you think this one would be suitable for my case?
Antonio
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CSD95490Q5MC: CSD95490Q5MC_VSON12
Part Number: CSD95490Q5MC
How to calculate the value of resistor which should be connected between LSEL and PGND?
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UCC2805: PSICE model uccx813-5 model in altium not working
Part Number: UCC2805
Hi,
I have to simulate UCC2805 in Altium Designer. I begine with unencripted model that I found at TI web page.
Due to syntax issues I modified an simmulation do not retur any error anymore, component is not working.
Below I am sending circuit and spice model.
(Please visit the site to view this file)
Regards, Klemen
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WEBENCH® Tools/TPS5401: TPS5401
Part Number: TPS5401
Tool/software: WEBENCH® Design Tools
Hello,
I'am using the TPS5401DGQR DC/DC converter with the following working ranges:
VIN_min = 4,5V
VIN_max = 30V
The WEBENCH® tool suggests to use the following voltage divider for the ENABLE pin:
RenT = 105kohm
RenB = 46.4Kohm
By doing this the maximum voltage drop on ENABLE pin would be arround 9V when Vin is 30V, but in the datasheet it is written that the maximum voltage on ENABLE pin should be 5V
How is it possible should I trust in the simulator?
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LM137: Certificate of origin for LM137H
Part Number: LM137
Hi TIer,
Could you provide a certificate of origin for LM137H? My customer would like to know LM137H made in which country, thank you.
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LM237: Certificate of origin for LM237KCSE3
Part Number: LM237
Hi TIer,
Could you provide a certificate of origin for LM237KCSE3? My customer would like to know LM237KCSE3 made in which country, thank you.
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BQ24070: bq24070 how to skip short circuit protection mode
Part Number: BQ24070
Hi,
I have trouble with the charger. I'm testing with the BQ24070
Schematic:
* I have 5V at the Input
* 25 ohm resistor Load at the output.
* No battery Connected.
Problem:
When I power the BQ24070, led PG is on and other are off. At the output it should be 4.4V, but instead there is just 0.25V
So my conclusion is that the device is on Short-Circuit protection mode.
I add a 10nF capacitor to DPPM pin, but the problem still there (when i add battery to circuit, it's work fine but not work when battery is not connected.
How can I skip from short circuit protection, when i have not battery in circuit and i can not disconnect the load from circuit.
thanks for your reply.
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UCC28600: Unencrypted SPICE model
Part Number: UCC28600
Hello,
Would it be possible to receive an unencrypted SPICE model of this part. We're having some issues with audible switching noise due to the burst frequency, but we also need to assure operation over the load range. It would me most efficient to simulate ourselves.
As far as I'm aware, my company does not have an NDA with TI, but I can arrange this if I can receive the necessary documents!
Kind regards,
Jef
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BQ24610: HIDRV and LODRV don't work in CHARGE state
Part Number: BQ24610
I developed a circuit board with reference to 10.2 Typical Application in BQ24610 datasheet. Charging function worked a few times, so I think the circuit is correct.
However, charging can't work now and I can not understand what occurs.
If you could have some idea, please give an advice.
<Behavior>
1. VBAT(16V, 4cells) is supplied. BATFET is turned on.
2. ADAPTER voltage is supplied. BATFET is turned off. #PG=LOW and #STAT1=LOW.
3. HIDRV and LODRV does not make any pulse. (When charging working, HIDRV and LODRV make pulse.)
Is the BQ24610 in some fault state or is it broken?
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BQ40Z50-R1: are they still able for SMUBS communication when they are in shutdown mode?
Part Number: BQ40Z50-R1
Hi Team,
For BQ20Z75, BQ20Z95, BQ40Z50, are they still able for SMUBS communication when they are in shutdown mode?
Thanks.
Hongjia
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TPS50601A-SP: Control Loop Stability / Phase margin / rising Phase at low load condition
Part Number: TPS50601A-SP
At low load condition (Vin=3.3V, Vout=1V, Iout only about 100mA) in our circuit the measured Bode Plot phase at 1kHz is at -180 degrees, then rises (!) and crosses zero degrees (!!) at about 22kHz where loop gain still is about 10dB. Unity Gain is at 54kHz, +30 degrees ("Phase margin"). Peak phase of +45° is at 200kHz where loop gain is about -15dB.
This shape of Loop Phase is unexpected and not in line with the simulation result using the TPS50601A-SP_AVG PSpice model
downloaded from the TI website.
Contrary to that weird shape of the Loop Phase, the shape of the Loop gain basically looks healthy; at 5.4kHz, it is about +23dB, and falls very linearly (well, in the log-log bode plot) at 23dB/decade. However, the 0dB point at 54kHz is much higher in frequency compared to simulation, and it is a bit close to the 367kHz switching frequency (fsw).
With "medium" load (Iout about 1A), that strange "rising phase / 0 degree crossing" appearance is gone; the measured loop gain slope is about -30dB/decade around the 0dB point at 29kHz; phase is pretty constant at about +45 degrees above that frequency almost up to 300kHz.
With "high" load (Iout about 2A), the 0dB point is at 23kHz; the shape of gain and phase is almost identical to the "medium" load condition (the loop gain just is some 3dB lower).
This marked dependency of the bode plot on load condition is not in line with the circuit simulation.
We use an LC input filter L=350nH, C=(33uF+0.1ohm)||1uF; output L is 2.2uH, fsw is 367kHz, output C is 330uF.
Time domain 50mA load change from the "low load" condition does show a single 0.6mV regulation loop overshoot (underdamped response, Zout about 0.01 ohms) with about 10us half-width. This measurement also reveals the output capacitor ESR of (also) about 0.01ohm.
In obtaining the Bode plots, the network analyzer output amplitude was set to minimum; a 10dB increase did not cause any significant change in Loop Gain/Phase (aside from noise, which of course increases with decreasing stimulus amplitude).
Q1:
Can you help me understand what that "low load" bode plot phase bahavior is telling me? Could that have to do with the output inductor current ripple "going negative", causing the HI-side FET to briefly in each switch cycle source current into the INPUT filter capacitor in the low-load condition? I can see that this "current reversal" is indeed happening when I measure across the 0.1ohms damping resistor which is in series with the input filter capacitor.
Q2:
What could be the reason for the difference between Bode Plot measurement and simulation?
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