Forum Post: RE: TPS5450 instability & outright failure @ certain Vin voltages
Really fast transients will require more output capacitance to support small voltage deviation. As a general rule of thumb, 1 A/usec is considered a "fast" transient. For my reference designs I...
View ArticleForum Post: RE: Overheating Voltage regulators, UA7805C, 78m33.
Amazing how much more things make sense once I see the math, thank you for the answers and help all of you, hopefully be solved as soon as I get the parts in.
View ArticleForum Post: RE: TPS2511 – Does TPS2511 not have Forced Vividre1 function such...
Please refer to TPS2511 datasheet page 20, Table 2 and Figure35, 36, 37 and 38. If DP/DM with D+/D- connection like Figure 35, TPS2511 support divider 2, if DP/DM with D+/D- connection like Figure 37,...
View ArticleForum Post: VFB voltage range of TPS51218
Datasheet says that VFB regulation voltage is typ0.7V and it is "Ensured by design, not production tested".But, customer hope to know it the VFB voltage range at CCM condition.Do you have any...
View ArticleForum Post: RE: LM2623 Voltage Ripple
First of all, while Ryan Tuck's comments were a little bit 'snarky', at least they elicited a response. So thanks!I do realize that my original question was vague. I'm not looking for someone to...
View ArticleForum Post: RE: LM5046 Used in Current Fed Phase Shift Full Bridge DC Dc...
1-The 10 ohms resistors are in the circuit in case a customer wanst to do remote output voltage sensing.Normally you don't need to use resistors with a lower tolerance than 1%, it really deepens on...
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Forum Post: TPS51200 malfunctioning
We are using TPS51200 in a board for DDR2 termination power. We are expecting a voltage of 0.9V at the Vout (VTT) rail and REF_OUT rail. But we are getting 0.3V only. Also after enabling the LDO, It is...
View ArticleForum Post: RE: boost converter in DCM
Hi Afiq,I can provide a much better solution now that I understand your need to breadboard. Please send your contact information to [a*n*s*t*o*n [at] ti.com] (remove * and spaces).Thanks,Anston
View ArticleForum Post: RE: BQ76PL536 EVM : false measurement result
Good.I am glad you found the problem.Yes, that will do it.
View ArticleForum Post: RE: TPS2350 transient limits and handling
Kim,I need to know your polarity. It makes a huge difference. Your wording is unclear.Is it RTN - SOURCE = 110V during the transient or SOURCE - RTN = 110V ? Please double check and specify.-Artem
View ArticleForum Post: RE: LM5119
HiTotal power is 25W. Assuming about 92% efficiency, the loss is 2W. In general, you don't need a heat-sink to cover this 2W. Regards,
View ArticleForum Post: RE: bq34z100 minimum sense resistor
Tom,Based on our measurements which we performed a variety of methods(multimeter, shunt,etc), the current is quite accurate and stable. This is only occurring with one chip at the moment, 3 other chips...
View ArticleForum Post: UCC27201
What are the output pull-up and pull-down resistances for the UCC27201? These are not specified on the datasheet.
View ArticleForum Post: RE: Linear power supply regulator 5V 2A with 7805
You need to dissipate 14Watts, so yes, this is inefficient and it is going to get hot. The point of adding the parallel transitor is to reduce the power dissipation in the LM7805 down to an acceptable...
View ArticleForum Post: RE: Opto-coupler usage in TL3844 flyback SMPS
Alejandro,Here are some papers to read that apply to your question:1./ http://www.designworldonline.com/feedback-loops-using-integrated-circuit-error-amplifiers/2./...
View ArticleForum Post: RE: Fullbridge converter build using LM5035B
Yes, we don't have a reference design to share with you but LM5035 can be used in a full bridge configuration as you described. The LM5045/46 simplified the full bridge implementation by integrating...
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Forum Post: Problems Regarding to Switching Regulator Output
Dear TI,We are using TPS62090RGTT regulator.We are design the circuit using the Web bench design referred by your TI.We are giving 3.4 to 5V as a input.We need 3.3 V , 1.3A as a output. But we are...
View ArticleForum Post: Minimum drive current out of the BQ29330 n-channel FET driver...
What is the minimum drive current rating out of the n-channel FET drivers (chg,dsg) in the BQ29330?My interpretation of datasheet spec for max rise time to ≥18V of ≤ 1000µs into 4700pF. By calculation...
View ArticleForum Post: RE: LM5112 GATE DRIVER
Hello Eli,The schematic which you have included looks correct with the VEE pin connected to the SW node. The boot diode and the boot cap has been rightly placed between the VCC and VEE pins. You can...
View ArticleForum Post: RE: LM2623 Voltage Ripple
Hi Daniel,A fellow engineer spotted this post had not received a TI'er reply and I wanted to jump in right away and apologize for not getting back to you sooner! The reason for the mix-up was...
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