8205A PDF

A are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for A. 28 Apr This manual contains new product information. Fortune Semiconductor Corporation reserves the rights to modify the product specification. A Transistor Datasheet, A Equivalent, PDF Data Sheets. MOSFET. Parameters and Characteristics. Electronic Component Catalog.

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Atmega i think you confusion is that the active and saturation regions for a mosfet and bjt are opposite. Alex 3 6.

A MOSFET Datasheet pdf – Equivalent. Cross Reference Search

Sign up or log in Sign up using Google. Here’s the example where M1 is reversed over-discharge protection fails.

Suggested to correct the 8025a for simulation. The drain voltage is only important when either. However, M1’s intrinsic diode would still be conducting! Now that we’ve gotten some background info out of the way we can get to answering your question.

Atmega 1 8 To answer your question about what the drain voltage will be relative to ground the battery’s negative terminalthere are a few cases:. As a few others have mentioned, the drains of that dual MOSFET will be pretty close to the same potential as the negative battery terminal. 2805a Your Answer Discard By clicking 8025a Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


Sign up using Facebook. This is assuming you measure in a “forward” direction from the BATT- terminal to the drains.

If you flipped M2, a similar situation exists where the protection circuit loses its ability to protect against over-charging. Normally, the drain of a mosfet is connected to the positive.

FS8205A 8205A MOSFET SMD Lithium Battery Protection 8 Pin TSSOP IC

In this we may get wrong results. You need to read the datasheet of DWP: With an increasing Vgs the mosfet turns 8205z and as it turns on Vds decreases. Over current protection for a 1-cell battery and Remove over-current protection of battery protection circuit. Dual mosfet A – lithium battery protection circuit Ask Question. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Home Questions Tags Users Unanswered. So the voltage at the combined drains will be a resistor-divider’s-worth above ground, say perhaps 0. Post as a guest Name. Note that M2 cannot disconnect the battery during normal operation due to it’s internal parasitic body diode, and this is the reason why M1 is required in this orientation to block “forward” flow when off. I still don’t understand it.

Power MOSFETs have body diodes present within their structure, this is a by-product of how they bare designed and it not always a desired feature this being one of those times.


FSA A MOSFET SMD Lithium Battery Protection 8 Pin TSSOP IC

The circuit given by Alex to 8250a appears to be wrong as it 825a drain to source, while the device A under discussion has both drains shorted. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


Because both source terminals of the two back-to-back MOSFETs are connected together, it’s really easy to put a positive bias on the gates as we can tie both gates together and drive them as one.

This is a basic lithium battery protection circuit, but looking at the dual mos-fet part of the circuit, It doesn’t make sense to me. To ensure that the battery can be completely isolated i.

8205A MOSFET. Datasheet pdf. Equivalent

Another thing to understand is that when Vgs rises Vds falls. The reason we use two back-to-back MOSFETs in this situation is because we want to make 8205s that we can completely block power from flowing in either direction when necessary which is a bit tricky with those pesky body diodes. When Vgs gets high enough Vds will drop below Vgs-Vth and the mosfet will go into the linear region.

Even if both MOSFETs were turned off, there is still a current path and the battery would continue discharging well past its safe discharge voltage.