The OVP option on Lamba power supplies was essentially an SCR across the output with a Zener diode that would trigger the SCR and blow the fuse or circuit breaker if an over voltage event occurred. They were often referred to as a crowbar.
Thank you for doing the video about this module, great video! I'm the one that originally requested it ;). The original reason that got this module my side, was to maybe, if suitable for the purpose, use it to protect my Commodore 64 (C64) retro computer, as apparently the original 5V (at 1.5-1.7A from what have found online) power supply bricks can fail and put out around 9V(?) and anything 5.5V or over, damages RAM and other chips in the C64.
LED between input and output, though it also needs extra protection against reverse voltage as well, because it very likely will be fried then, and probably go short between input and output, along with the internal mosfet body diode conducting with reverse voltage.
you could set it up to drive a voltage sensitve relay to add a 2nd battery in your 4WD for when you are driving and disconnect when alternator isn't charging
Was not able to find what chip this module was using myself and that's it, you correctly identified the exact same part used on this module: AWINIC (Shanghai Awinic Tech) AW33905FCR.
An interesting video and a useful part. Without re-watching the video it doesn't give over-current protection - perhaps it simply goes open circuit with smoke indicator. 😀
Yes, I think he misspoke. That is an N-channel MOSFET, which is why it needs a charge pump to generate a voltage _above_ the source voltage to work. (N-channel you need to pull the gate up to turn it on, P-channel you need to pull it down)
Wot, OVP that does not trigger a SCR that short-circuits the supply line and burn the tracks if the incorrect fuse was fitted???? Sacrilege I tell you…😂😂😂
Not a bad idea, much simpler than changing the whole device. Some of the power supply devices can haw nasty spikes, esp if they are pluged in the consumer and than in the wall socket. TVS diodes can go south wery easy, how much more reliable is this we shall see
Seems like it’s protection intended for placing at the input of your device using a lithium ion cell supply which might be hooked up to a charging circuit 😊
looks a little parasitic... I hate to see voltage dividers. I guess on a 'dc in' plug/socket combo its not a great load to worry about and i very much doubt this would be ever needed on a battery powered device .
You need to test the overvoltage range to failure. It is useless if you don't know the max input voltage it can protect against and if it fails shorted to output or ground.
The exact part shown in the video was correctly identified in a comment by @InkNoid-o4u - It is: AWINIC (Shanghai Awinic Tech) AW33905FCR. It's available from LCSC and they also have datasheet there.
The OVP option on Lamba power supplies was essentially an SCR across the output with a Zener diode that would trigger the SCR and blow the fuse or circuit breaker if an over voltage event occurred. They were often referred to as a crowbar.
And on some early colour tv receivers here in the uk, i still have some of those trip switches!.
The problem with crowbars is your device catches fire if the fuse fails and doesn't pop or someone replaced it with a paperclip.
Thank you for doing the video about this module, great video!
I'm the one that originally requested it ;).
The original reason that got this module my side, was to maybe, if suitable for the purpose, use it to protect my Commodore 64 (C64) retro computer, as apparently the original 5V (at 1.5-1.7A from what have found online) power supply bricks can fail and put out around 9V(?) and anything 5.5V or over, damages RAM and other chips in the C64.
LED between input and output, though it also needs extra protection against reverse voltage as well, because it very likely will be fried then, and probably go short between input and output, along with the internal mosfet body diode conducting with reverse voltage.
you could set it up to drive a voltage sensitve relay to add a 2nd battery in your 4WD for when you are driving and disconnect when alternator isn't charging
This looks like a must-have for unreliable power sources like wind and solar.
This module seems use an AW3390x series over-voltage protection load switch.
Was not able to find what chip this module was using myself and that's it, you correctly identified the exact same part used on this module: AWINIC (Shanghai Awinic Tech) AW33905FCR.
An interesting video and a useful part. Without re-watching the video it doesn't give over-current protection - perhaps it simply goes open circuit with smoke indicator. 😀
it has thermal shutdown
The magic smoke indicator is more fun though😂
4:50 My leader told me this is N-Ch MosFet
Yes, I think he misspoke. That is an N-channel MOSFET, which is why it needs a charge pump to generate a voltage _above_ the source voltage to work. (N-channel you need to pull the gate up to turn it on, P-channel you need to pull it down)
Would be very easy to control very high currents with this by using it to control a relay or monster size IGBT.
Wot, OVP that does not trigger a SCR that short-circuits the supply line and burn the tracks if the incorrect fuse was fitted???? Sacrilege I tell you…😂😂😂
LT4366 to the rescue for more demanding applications.
Not a bad idea, much simpler than changing the whole device.
Some of the power supply devices can haw nasty spikes, esp if they are pluged in the consumer and than in the wall socket.
TVS diodes can go south wery easy, how much more reliable is this we shall see
So how does it know what the system voltage is supposed to be? ie it cuts off at X volts above and below a voltage Y. Where is voltage Y set?
(Ah, used your new template!) !!
looks nice, right?
Neat device.
It's so teeny tiny - the whole module compares to PC817 in size!
Seems like it’s protection intended for placing at the input of your device using a lithium ion cell supply which might be hooked up to a charging circuit 😊
looks a little parasitic... I hate to see voltage dividers.
I guess on a 'dc in' plug/socket combo its not a great load to worry about and i very much doubt this would be ever needed on a battery powered device
.
By parasitic do you mean the power drawn by the voltage divider?
You need to test the overvoltage range to failure. It is useless if you don't know the max input voltage it can protect against and if it fails shorted to output or ground.
read the datasheet. 28V
@IMSAIGuy but the datasheet was for a different part or did you find the correct datasheet after all.
someone claims it is a AW33901. that datasheet says 32V. I gave you a conservative number.
The exact part shown in the video was correctly identified in a comment by @InkNoid-o4u - It is: AWINIC (Shanghai Awinic Tech) AW33905FCR. It's available from LCSC and they also have datasheet there.
It's a pity that it consumes so much power; 85μA is quite a lot, especially if I wanted to use this circuit to protect a cell from excessive discharge