Part Number: TPS25200 I have used TPS25200 for the purpose of the current limitation in my circuit. I have used 60.4Kohm for Rlim, and using equation 1 of the datasheet, Ios nominal will be approximately 1.5A. For testing, I used the potentiometer to reduce the load and thus increasing the current. But after testing the circuit I found out that for the value of 60.4k, TPS25200 limited the current in the range of 500mA. Then I tried to reduce the resistance of Rlim and found that for the value of Rlim in between 15k to 20k, threshold current changes drastically from 500mA to 5A. And the above tested has been done on different TPS25200 IC. Also as per the datasheet Rlim value should be between 33kohm and 1100kohm with the maximum current threshold of 3.1A. Concluding, TPS25200 is limiting the current but not with the desired value calculated through the equation from the datasheet. What should I do to get the desirable threshold current?
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Forum post: TPS25200: TPS25200
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Forum post: TPS54202: Quiscent Current
Part Number: TPS54202 Hi team, In datasheet, the non switching quiescent current is 45uA. But in actual application, customers care more about switching quiescent current. I have two questions as below: 1. How to test the non switching quiescent current? In other words, what's the test condition of 45uA? 2. I think 45uA makes no sense. Why don't we test switching quiescent current and write the result on datasheet? Best regards, Nison
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Forum post: RE: BQ20Z655-R1: BQ20Z655-R1
Kevin, TI battery chargers like BQ24725A or BQ24780S have the charging current and battery voltage registers as the standard address of 0x14H and 0x15H defined by Smart Battery Charger Specification. The SMBus chargers can receive the smart battery’s broadcast of Vbat and Ichg, but the chargers are not compliant to the full requirements of level 2 slave chargers.
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Forum post: RE: BQ34Z100: BQ34Z100 programing issue
Hello Yangbo. My message is not the answer to your question, but it will probably be interesting to you. I recently did an experiment to replace the version of the FW in the bq34z100 chip. So, the initial state is the chip bq34z100 FW=0016. I wrote the SENC file with version 0006 to the chip. After exiting the programming mode (Boot mode), to my surprise, I saw a cyclic reset chip. The chip is not working properly. When I try to read any data, I see garbage. Switching the chip into programming mode is not possible. Output: Probably the version of chip FW=0016 is not compatible with version FW=0006. It is very interesting to hear the comment of TI specialists. P.S. The procedure for reading and writing new data (SENC) is correct, without errors and stops. It is checked several times on different chips.
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Forum post: RE: TPS54202: Quiscent Current
Nison, I do not directly support TPS54202, but I can answer your questions: 1. The quiescent current is measured using the ATE in an open loop configuration. EN is high to 5 V and the FB pin is forced to 1 V, which is above the 0.596 V reference. Forcing VFB high causes the device not to switch and the current is measured. 2. The measurement you are interested in would require a closed loop test. The switching no load current is the non switching quiescent current plus the switching current. The switching current is application dependent. It will vary with Vin, Vout and the output inductor value. It is not practical to test that in ATE.
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Forum post: RE: BQ40Z80: BQ40Z80 automatically shutdown FETs when error occurs
Hello Caner, Thanks for clarifying. Unfortunately, it is not possible for selective protection. For example, if you disable the FETs for CUV, you end up disabling it for COV, and every other individual protection. I will notify our systems team for the next catalog release to consider this feature. Sorry about that.
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Forum post: RE: BQ40Z80: BQ40Z80 How to do manual cell balancing ?
Hello Caner, I see! In other words, you want to send commands to manually control the balance FETs for VC7 through VC1 right? I don't think the bq40z80 can achieve this, again I will notify the systems team. Why are you using the bq40z80 as an equivalent monitor if I may ask? Is it because you also need the gauging feature in a one chip solution?
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Forum post: RE: BQ40Z80: BQ40Z80 how to create a golden image ?
Hello Caner, I see... For some reason the golden image plug-in does not show up for me either. Let me check. In the mean time, you can only read out an srec file. That is under the "firmware tab". Let me check with the tools team on enabling this functionality. Are you able to program srec files in your system? Normally, the bq40z80 is a pack side gauge, so this is done by pack makers. I checked and the bq40z50 also does not have this functionality.
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Forum post: RE: BQ35100: Sense Resistor Placement
Hello Sepeedah, Nope, it uses an older platform that can only support low side. The high side sense resistor option is useful for customers that want a uniform ground. For example, if you have 5 amps flowing through 10 mOhm sense, that's a 50 mV delta between the cell ground and your system ground.
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Forum post: RE: BQ34Z100-G1: Calibration and golden image
Hello Paddy, I think the ground plane needs to be checked. Did you check if the device responds in ROM mode?
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Forum post: RE: BQ27750: without button WakeUp
Hello Andrew, The bq275xx series such as the bq27542 or bq27546. The bq27520-G4, bq27z561 are all good options.
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Forum post: RE: WEBENCH® Tools/BQ35100EVM-795:
http://www.ti.com/lit/an/slua801/slua801.pdf
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Forum post: RE: BQ40Z80: BQ40Z80 missing CHEMID
Could you double check? I can see the ChemID 2554 in my bqStudio. Andy
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Forum post: BQ40Z50-R3-DEVICE-FW: BqStudio does not recognize firmwareR3
Part Number: BQ40Z50-R3-DEVICE-FW I have Down loaded the new and the latest test files for BQstudio. It appears that maybe the nw file SLUC525V which gets downloaded is not really the latest (V 1.3.96) . Version R3 does not show up in the program or in the CONFIG directory.
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Forum post: LM117: rad-hard LDO with an Enable pin
Part Number: LM117 Hi, Does TI have a rad-hard LDO with an Enable pin? I need three different voltages and of course could use three of the same part number adjustable LDO's. 1. Input voltage 5V, output voltage 3.3 volts, max output current 100 mA. 2. Input voltage 5V, output voltage 1.8 volts, max output current 100 mA. 3. Input voltage 5V, output voltage 1.25 volts, max output current 100 mA.
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Forum post: RE: BQ40Z50-R3-DEVICE-FW: BqStudio does not recognize firmwareR3
Hello Mike, We started releasing bqzs as part of the FW release on the products page. Go to the bq40z50-R3 products page and download the FW package. You will find the bqz file there. Place it in the config folder in the bqStudio directory.
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Forum post: RE: TPS720: VBIAS connection
Thank you! Best regards, KM
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Forum post: CSD13385F5: MOSFET basics: how come this FET only has unidirectional gate-source diode?
Part Number: CSD13385F5 Hi, I am rather used to seeing bi-directional diodes (like two Zeners facing each other) between gate and source in MOSFETs. However, this part has a uni-directional diode. 1) How come? 2) In what way would you say I should take this into consideration when selecting whether to use this part? In this case I am planning to use this nFET to switch on/off a high-side pFET (grounding/not grounding its gate) acting as a load switch. Thanks!
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Forum post: RE: TPIC7218-Q1: Gate voltage drive on the GPR pins is NOT sufficient to provide a strong V GS
Hi, Thank you for your question. I will assign it to the engineer who supports this device. Please expect a response by 12/19/19 Kind Regards, Shinya
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Forum post: CSD13385F5: Would need unencrypted SPICE models
Part Number: CSD13385F5 Hi, We are considering to use CSD13385F5 in combination with CSD22204W. However, we would need unencrypted SPICE models to first verify that the design idea works in detail. Could you please instruct us on how get a hold of these two models? Thanks!
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