SMPS in Linear Regulators
In a project of adjustable power supply that uses linear regulators (LM317, LM 350), it would be better to use as power source a conventional transformer or a SMPS?
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Re: SMPS in Linear Regulators
Welcome, Tiloeco!
It depends on the application. Some audio and/or video equipment may have electrical noise issues when used with switching supplies.My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics. -
Re: SMPS in Linear Regulators
If it is a general purpose bench supply i would use a switcher, if it's for sensitive equipment (anything at the levels of a microphone or lower), it should be 100% linear. But using a SMPS then heating up a linear reg doesn't sound right IMO, why not an adjustable SMPS?A working TV? How boring!Originally posted by PeteS in CAComment
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Re: SMPS in Linear Regulators
i did stuff like that back in school days, we used the reg trans and worked fine, but i guess implementing the SMPS has got to work... it may just not work properly on what you need, like japlytic mentioned.
peace.We don't have a great war in our generation, or a great depression, but we do, we have a great war of the spirit. We have a great revolution against the culture. The great depression is our lives. We have a spiritual depression.Comment
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hello ,for diy voltage injector for short killer/finder -- is it possible to use something like this - LM317 DC Linear Regulator, DC-DC 4.5~40V Turn 1.2~37V, Step Down Power Module, Adjustable
and ampere controller along (to make it zero amps ) with some addons(transistors diodes etc.) for it -- and use some 5v adaptor or 3.3v volt rail of my smps power supply as input and finally get 1v and zero amps for injecting voltage to find out short circuit component ? ..
for source input -- can we use 3.3 -4 volt 18550 battery ?( i have some of those ) and then adding ampere regulator... -
The RT8205L RT8205M is a dual step-down, switch mode power supply controller generating logic-supply voltages in battery powered systems. It includes two Pulse-Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and also features fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the PWM outputs. An optional external charge pump can be monitored through SECFB (RT8205M). The RT8205L/M includes on-board power up sequencing, a power good output, internal soft-start, and internal soft-discharge output...10-23-2024, 03:58 AM
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The RT8205A RT8205B RT8205C dual step-down, switch-mode power supply controller generates logic-supply voltages in battery-powered systems. The RT8205A/B/C includes two pulse-width modulation (PWM) controllers fixed at 5V/3.3V or adjustable from 2V to 5.5V. An alternative LGATE1 output LG1_CP can be used for external charge pump (RT8205B). And an optional external charge pump can be monitored through SECFB (RT8205C). This device also features 2 linear regulators providing fixed 5V and 3.3V outputs. The linear regulator each provides up to 70mA output current with automatic linear-regulator bootstrapping...10-23-2024, 03:37 AM
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Hello
I've got two W530 boards, one with K1000M and one with K2000M graphics card. The first one had an issue of turning off under heavy CPU load after about 30 minutes or in idle. GPU load wasn't causing it to shut down. Trying to turn it back on would only make the power LED to come up for about 2 seconds without fan spin or thinklight flash, and that's it. It also wasn't charging the battery after it died.
Gently pressing the laptop in left upper corner would fix this problem for a couple of days.
The latter is completely dead and has the same 2-second power blink, nevermind... -
The TPS51427A TPS51427ARHBT TPS51427ARHBR are dual synchronous step-down controllers designed for laptop and mobile communications applications. This device is part of a low-cost suite of notebook power bus regulators that enables system designs with low external component counts.
The TPS51427A includes two pulse-width-modulation (PWM) controllers, SMPS1 and SMPS2. The output of SMPS1 can be adjusted from 0.7V to 5.9V, while the output of SMPS2 can be adjusted from 0.5V to 2.5V. This device also features a low-dropout (LDO) regulator that provides a 5-V/3.3-V output, or adjustable...10-23-2024, 02:37 AM
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