https://e2e.ti.com/support/power-management-group/power-management/<p style="display:none;">blank</p>en-USTelligent Community 13https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1673267/ucc28063a-the-design-issue-for-ucc28063aFri, 14 Aug 2026 07:01:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:c2e511b8-1908-44bb-827b-8d7c4d2e7418Zhang LiangPart Number: UCC28063A Hi, We use UCC28063A for the PFC control, and the MOSFET and diodes are destroyed when we ageing test, there are about 20 boards / 5000 boards, this below is our analyze and test waveforms: The main current problem is that the inductor current has not crossed zero, but the MOSFET driver is outputting, causing it to enter the CCM working mode. This solution was designed based on the selection of FPC diodes for the DCM working mode. This situation will result in reverse recovery current of the diode, causing failure of the MOSFET and the diode. Blue represents the forward current of the PFC diode, red represents the signal from the ZCD detection pin of the chip, and green represents the MOS driver. It can be seen that when the ZCD signal pin does not drop below the zero-crossing detection threshold, the driving situation is triggered, causing the CCM working mode to be entered. At this time, a large reverse recovery current occurs in the PFC diode. The test revealed that during rapid power on/off cycles, the reverse recovery time of the current-limiting diode increased, and the reverse current also increased. The time when the current spike occurred corresponded to the maximum value of the MOS driver. By replacing the silicon carbide diode with one that has no reverse recovery time, the current spike disappeared. The below is our schematic for your evaluate:Industrial AutomationUCC28063Ahttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1673228/lm74910-q1-remove-current-detect-function/6450800Fri, 14 Aug 2026 07:00:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:2d4da4b6-f3e9-4518-99bd-a1416ed12458Haiwen HuangShiven: Can we remove RSET and RISCP resistors? I think once Rsense is short , IC can&#39;t detect voltage and do protect function. Thanks .https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1670387/ucc25661x-calc-confusion-about-ucc25661-simplis-simetrix-simulation/6450795Fri, 14 Aug 2026 06:55:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:8e89a6b6-d322-4ef2-8d27-81ffcc780875Pritam BanerjeeHi Edmund, Great if you solved the earlier issue. Was it a power limiting issue? May I know how you got this SIMPLIS model, as the fsw input should be a 5 bit input but in your sim model the implementation is something else? If you are using option #5 then put 00101 in that field and simulate. Regards, Pritamhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1672217/lm66100-lm66100-comparator-not-working/6450793Fri, 14 Aug 2026 06:55:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:3de47141-dd36-489c-9420-d1664839f87dShiven DhirHi Tangku, Can you try putting higher load say 2/3k Regards, Shiven Dhirhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1673261/bq40z80-bq40z80---random-cell-connection-supportFri, 14 Aug 2026 06:49:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7ac94a15-ccac-4bd9-9a60-80992c3e3eeeTom TsaoPart Number: BQ40Z80 Hello Sir: We want to know does BQ40Z80 has random cell connection support? Or do you have some guide line on it? Please kindly provide your recommendations for us. Thank you!Appliancesbq40z80https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1673257/bq76907-q1-charge-integration-in-sleep-modeFri, 14 Aug 2026 06:45:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7519dd66-5191-4aa9-995e-907ea2e21642Ankit KumarPart Number: BQ76907-Q1 I am using BQ76907-Q1 for my 12V Li-ion battery used in SLI application. I am putting the AFE in SLEEP mode based on certain conditions. In my application, there is possibility of current drain from battery when it is low power mode. By low power mode I mean the AFE and MCU are in low power mode. I would like to understand if the charge integration which uses CC1 current works in AFE SLEEP mode. I have tested the PASSQ() while the AFE is in sleep mode and have below observations : Given that the AFE is in sleep mode and battery is charging, the charge integration works in SLEEP mode as well. For e.g. if PASSQ() value was X before sleep and during sleep Y amount of charge was accummulated by the battery during sleep, then upon wakeup AFE started accummulation from the value X + Y. Given that the AFE is in sleep mode and battery is discharging, the charge integration does not work in SLEEP mode. For e.g. if PASSQ() value was X before sleep and during sleep Y amount of charge was accumulated by the battery during sleep, then upon wakeup AFE started accummulationfrom the value X only, Y was not considered in the accummulation. The above observation is contradicting the below statement in BQ76907-Q1 TRM : Needed support on this. Kindly help.BQ76907-Q1https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1672217/lm66100-lm66100-comparator-not-working/6450766Fri, 14 Aug 2026 06:33:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:d1f7577c-d3bf-4d2d-9c7f-07ea9320e770Tengku Abdul HavasHi Shiven, I did put a 12k preload resistor at Vin but it still didn&#39;t work. when I took out VCHARGE, VBATT immediatelly backfeeding to VCHARGE as seen in the below waveformhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1672804/lm51772evm-hp-lm51772-i2c-current-limiter-not-working/6450762Fri, 14 Aug 2026 06:31:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:d4b256d4-ec7b-44d5-938b-f76a2a4b9b21Stefan SchauerHi Chetan, thanks for tests and the update here. So most looks good and as expected. But please check case 2 again. This this with I Limiter disabled via I2C with IMON_LIMITER_EN = 0 It should behave identical to Case 1 - if not something with your I2C communication is not OK. Best regards, Stefanhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1673242/tps922053-simplis-simulation-model-for-tps922053-tps922055/6450758Fri, 14 Aug 2026 06:27:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:69dd1881-d8c8-44c6-9397-3609b06de3aaLucia GaoHi Sundar, Pls find here: Thanks! BRs Luciahttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1671584/ucc28950-ucc2895x-psfb-output-rectifier/6450757Fri, 14 Aug 2026 06:27:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:16f7e2d3-c1e8-449b-b984-9543d826b840Anil KumarHi Isaac, Yes, the center tap configuration yields lower conduction losses because current passes through only one diode forward voltage drop instead of two, however, a full bridge configuration is highly suitable for high output voltage, low current applications where conduction losses are not significant. In your application where output voltage varies from 15V to 220V, with lower voltages, losses can be higher with full bridge, so considering the whole range of operation you can consider going with center tap configuration. Regards, Anilhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1671943/tps274c65-rcb-failure/6450755Fri, 14 Aug 2026 06:25:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:0fd2a55d-69f1-492c-a3c3-176d5eabfc8cJoyce ChenHi Patrick, I am a little bit confused about the question you use, the LM74700&#39;s schematic is as below. [quote userid=&quot;566586&quot; url=&quot;~/support/power-management-group/power-management/f/power-management-forum/1671943/tps274c65-rcb-failure/6446677&quot;] Below is the VS power circuit (LM74700) in customers&#39; board: [/quote] External power: lab power. Same external power is used to test on EVM and customers&#39; board, both work normally. Customers&#39; system power design: VS through LM74700 as the Anti-Inverting function, then power for TPS274C65. Also short LM74700 part circuit, that means customers&#39; system power Vs not through LM74700 but directly connect to TPS274C65, and EVM and customers&#39; board RCB work normally. So, this is related to LM74700&#39;s design part. But this is necessary for customers&#39; projects. So want to search your help on solutions. Thanks. Joycehttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1672583/bq41z50-bq41z50-exporting-complete-flash-files-for-production/6450746Fri, 14 Aug 2026 06:15:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:6664a09f-afcf-4893-a5e2-4a3f12718015SImon Carlssonok yes this worked a treat. I always assumed that the &quot;Path for encrypted bq.fs&quot; referred to the destination path not a source. thank you!https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1673135/tps25942a-difference-with-tps25944/6450747Fri, 14 Aug 2026 06:15:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:23fe7f3a-5ca0-4fd2-b739-60b5a777f6bfSailendra KumarHi Adam, TPS25944 TPS25942 the internal circuitry inside the die have the above differences Best Regards, Sailendrahttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1671943/tps274c65-rcb-failure/6450740Fri, 14 Aug 2026 06:11:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:c2c1de77-bfad-4864-811f-e8e4ac7c314aPatrick ShaltonHi Joyce, What power supply does the system board power/LM74700 use? Is it the same external supply that was used to test without the LM74700? And is it the same supply that will be used in the field? Thanks, Patrickhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1672016/lmr38020-how-to-decrease-the-output-ripple/6450737Fri, 14 Aug 2026 06:10:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:c41fdf2e-2c68-489e-810e-cae19a07c606s sunHi,dear. The amplitude of ripple is the highest priority in this project. As to the DCR of the inductor&#39;s inherent parameter, does it have a significant impact on the ripple? If the value of parameter is not important, I can select an inductor between 10uH to 15uH randomly. Thank you!https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1671943/tps274c65-rcb-failure/6450736Fri, 14 Aug 2026 06:08:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:e64cd268-c2cf-471b-870e-2efe3e0370f9Joyce ChenHi Patrick, [quote userid=&quot;525149&quot; url=&quot;~/support/power-management-group/power-management/f/power-management-forum/1671943/tps274c65-rcb-failure/6450702&quot;] 1. This is likely because there is not enough capacitance on the input to sure the VS net can sink a full 0.5A from VOUT. Many power supplies have a small output capacitance on them and can only sink current, so if an external voltage is placed on the supply output, the supply will be pulled up to that voltage and TPS274C65 cannot detect a voltage difference between VS and VOUT. In the field, most systems are powered by a battery, so we will need to see what the power supply will be in the product&#39;s end application. Did the customer use the same supply when testing with their board and the EVM? [/quote] There are two power types during the tests: one is external power; one is system board power using LM74700. When using external power, customers&#39; board and EVM work normally. When using system board power (LM74700), both customers&#39; board&#39;s and EVM&#39;s RCB don&#39;t work. So, the issue is located to power design and the conclusion is as below. anti-inverting circuit of VS and TPS274C65&#39;s output RCB are necessary for customers. So, it is critical to give workarounds of this. [quote userid=&quot;566586&quot; url=&quot;~/support/power-management-group/power-management/f/power-management-forum/1671943/tps274c65-rcb-failure/6446677&quot;] So, we find out that in VS path, when there is a LM74700 designed for input Anti-Inverting Circuit, RCB function will not work. In customers&#39; system, input Anti-Inverting Circuit and output RCB feature are needed. So, could you kindly check why input Anti-Inverting Circuit occurs, TPS274C65&#39;s RCB doesn&#39;t work? If any solutions or workarounds to help achieve input Anti-Inverting Circuit and TPS274C65&#39;s RCB feature? [/quote] Thanks. Joycehttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1672219/tps65994ae-intel-adl-p-tbt4-host-can-t-detect-tbt5-dock-with-tbt5-cable/6450732Fri, 14 Aug 2026 06:05:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:caf5a641-439c-4a1e-b8c8-df3c6ff9a2edLogane2e.ti.com/.../TBT-can_2700_t-detect_5F00_TPS65994AE-I2C2-log.tarhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1672219/tps65994ae-intel-adl-p-tbt4-host-can-t-detect-tbt5-dock-with-tbt5-cable/6450729Fri, 14 Aug 2026 06:04:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:1d7036ac-de32-42ff-8ff0-df03acec17e6Logane2e.ti.com/.../TBT-can-detect-with-Ellisys-connected.tarhttps://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1673251/tpsm33625-msl-levelFri, 14 Aug 2026 05:57:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:35ac7eba-4587-4ac1-a6e3-91ac8978bf70Kengo.YPart Number: TPSM33625 Hi team, TPSM33625RDNR TPSM828211SILR I can&#39;t find the MSL level for these devices. In your web site, the MSL level is blank. Could you tell me what is the MSL level? And, why are these blank? BR, Kengo.TPSM33625https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1671701/tps25946-tps25946---en-pin-in-drp-configuration/6450703Fri, 14 Aug 2026 05:42:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:a34a298a-2196-4448-a6d0-50dd28ae31e2Sailendra KumarHi Tomasz Yes the schematic looks fine Best Regards, Sailendra