Excellent video.

Great

❤❤

Hi, i'm sorry for the noob question: does this charger IC has any sort of overcharge, overdischarge and short-circuit protection? Thanks! Amazing content!

@ForceTronics

10 ай бұрын

It has some protection features but not very robust. It does not have the ability to electrically isolate the battery if an issue such as over discharge is discovered

How can I design a lithium charger with both an LCD screen and Temperature Sensor for AA and AAA batteries

Hello! Great tutorial. Could you please also show schema for 3.3V output? The battery is 4.2V-2.5V and this is right between therefore sometimes step down and sometimes step up. Thank you.

@ForceTronics

Жыл бұрын

Great Question! If you look at the TPS61202 that I used with a fixed 5V output you can see that it is actually spec'd for a max input voltage of 5.5V so these ICs do have "buck" capability built-in even though they are advertised as boost converters. If you go to TI's product page for the TPS61201 (3.3V output) you can see it has the same max voltage input of 5.5V so TI is telling us it can support input voltage higher than 3.3V. For selecting an inductor for the design, I suggest you select an input voltage (within the range of a Li-ion cell) that gives you the largest inductor value and an input voltage value that gives you the largest peak inductor current. Form there you can always go to TI's support forums and post the components values you choose and why and ask for feedback to ensure you made the best choices. I have always gotten good advice using their support forums. Please share what you come up with.

@davepompea

Жыл бұрын

The battery cannot go down to 2.5 volts. Below 3.5v the energy left is small and the risk to damage it is great. Typically only under high load do you allow So to answer your question, just use a 3.3v ldo regulator. If your entire load is 3.3v, no need to boost the battery to 5v, any of the many TP4056 based boards will do just fine to charge / protect the battery. If your supply voltage is not 5v then a LM7805 regulator to feed it will take up to a 25v input.

@PetrKoc

Жыл бұрын

@@davepompea That is only partial answer as for fixed installations you better go with LiFePO4 as it is much safer than Li-On. And that type has lot of energy below 3.3V.

@davepompea

Жыл бұрын

@@PetrKoc No doubt, but the video series is about Li-Ion battery.

@PetrKoc

Жыл бұрын

@@davepompea Well... yes and no. What if I wanted 3.6V output for any reason? Then it would be necessary to take care of this situation even with Li-Ion.

And circuit diagram please

I would caution anyone building this to take great consideration to the hash/noise radiated by a switcher that is on the same pcb or very near the circuit that is being powered. Something like this can easily disrupt I2C / SPI signals.

@ForceTronics

Жыл бұрын

I love commenters like this 🙂 Any commercial device on the market where battery life is critical, whether it is an electric car, cell phone, or a VR headset, the main power conversion that is used at the battery is always a switch based converter because they are so much more efficient then linear regulators. There maybe a linear regulator further downstream for noise sensitive circuits in a battery powered design but the converter closet to the battery is always switched based. At least that is my experience for the battery powered projects I have been a part of. Noise is always a concern with switched based power conversion but somehow cell phone designers are able to use them in tightly compact designs with various sensitive digital, audio, and RF signals. Tune in for part 4 where we talk about PCB layout techniques for handling noisy switch based voltage converters.

@gd2329j

Жыл бұрын

@@ForceTronics Linear regulators are not noise filters !

@ForceTronics

Жыл бұрын

@@gd2329j Actually yes and no. The main purpose of linear regulator is to regulate a constant voltage or current output. But filtering noise is a secondary feature of a lot of linear regulators on the market (especially LDOs). If you look at a linear regulator datasheet, like the NCP164CSN330T1G, you will notice a spec called "PSRR" which stands Power Supply Rejection Ratio. This spec communicates the linear regulator's ability to reject or attenuate noise on its input from its resulting output. PSRR is a spec I pay attention to when selecting a linear regulator to create a voltage bus to power a noise sensitive circuit, such as a thermocouple measurement circuit or a load cell measurement circuit