FDMF5820DC Smart Power Stage

Have you done creating high current power stage circuit diagram using the FDMF5820DC? Recently, I decided to create one by following the diagram below with instruction of course.  It is the next generation family of Fairchild with fully optimized, ultra-compact, integrated MOSFET plus driver power stage solution for high-current, high frequency, synchronous buck, DC-DC applications.

Check some features of FDMF5820DC.

• Ultra-Compact 5 mm x 5 mm PQFN Copper-Clip Package with Flip Chip Low-Side MOSFET and Dual Cool Architecture

• High Current Handling: 60 A

• 3-State 3.3 V PWM Input Gate Driver

• Dynamic Resistance Mode for Low-Side Drive (LDRV) Slows Low-Side MOSFET during Negative Inductor Current Switching

• Auto DCM (Low-Side Gate Turn Off) Using ZCD# Input

• Thermal Monitor for Module Temperature Reporting

• Programmable Thermal Shutdown (P_THDN)

• HS-Short Detect Fault# / Shutdown

• Dual Mode Enable / Fault# Pin

• Internal Pull-Up and Pull-Down for ZCD# and EN Inputs, respectively

• Fairchild PowerTrench® MOSFETs for Clean Voltage Waveforms and Reduced Ringing

• Fairchild SyncFETTM Technology (Integrated Schottky Diode) in Low-Side MOSFET

• Integrated Bootstrap Schottky Diode

Encapsulated MicroVerter

I’m doing some research about the advantages of Encapsulated MicroVerter to be use in my circuit diagram project but upon doing my research I found out that there are many of them to choose from. 

I choose to use Encapsulated MicroVerter because of the auto recovery from OTP / OCP / OVP Circuits features that perfectly used in myproject. I choose this as well because I’m looking a second generation that high efficiency electrical power design and proprietary advanced thermal management. For more feature please read Encapsulated MicroVerter.

Solar Circuit Diagram

Just this morning a gleam idea that was pop up to my mind to create a solar circuit diagram and I want it simple and easy to understand to the newbies. After my coffee I went to my laptop table and start my research about this solar circuit diagram and after 2-3 hour of doing some research I found this cool site that maybe can help me. 

 You can see below the very basic small solar installation with connection for adding additional solar panels. 

The 20 Amp main fuse used can vary depending on the load from your whole system and whether or not an inverter and AC circuitry is added. After specification of the wiring I generally try to start with a lower fuse than is really needed, switch everything on for a few minutes then if the fuse is OK stay with that, but keep a spare correct higher value one handy just in case, changing it only after a thorough inspection of the system. It is just the way I am, if I am supposed to use a 2 Amp fuse I will probably be trying a 1 Amp fuse first on the principal stated above. 

 Always remember - The fuse should always be rated less than the wire/run it is protecting, the fuse must always be the weakest link! 

The small fuse without a value is determined by the nominal output from the solar panel(s) and the wire gauge used, for example a 27w panel has a nominal output of around 1.5 Amps so it would be best to fit a 2 to 3 Amp fuse after first using the correct wire run. This is worked out by Ohms law i.e. watts (27 w) ÷ volts (approx panel voltage 17.5 v) = Amps (1.5) hence the 2 to 3 Amp fuse.

If you have time you can check also my design of a battery charger schematics.

Problem Encounter in RS485 Circuit

I had designed a little board to interface USART to RS485 circuit that has two types of connection: one row of the DIP MAX232, or the ISP header for ATmega64-128-1281-2561 family. 

But after few hours of design, I had decided to improve the circuit, by adding automatic capabilities to the T/R signal, instead of using SCK from the ISP header.

After 2 hours of using Google doing some search for circuits that automatically switch T/R signal, I didn't find anything interesting about the problem I have. Only one circuit that uses a simple transistor and few resistors, but that doesn't satisfy me, since I'm not sure if I do switches off the transceiver too early after the last bit had been sent.

I must say that I have a little being lazy guy, since I'm asking for suggestions about that which I think it’s a good idea to ask some help from you guys because I know some of you may encounter same problem as I encounter right now.

My first bet would be to add a capacitor between T/R pins and ground or VCC to add some delay.

Has someone experience with this kind of circuits? Can you share your idea and thoughts about it or someone that can give advice about this?

Bass-Treble Circuit Using Op-Amp 741

Will make this bassamplifier circuit quick and easy. I’m creating a bass-treble circuit using the Op-Amp741. Yes it is simple but don’t under estimate because it is also a powerful bass, treble, volume control is made by General Op-Amp IC LM741.  The maximum voltage that you can input in this powerful bass is 12V, but don’t worry because this circuit also works in 9v and 6 Volts. The circuit has inbuilt pre-amplifier also.

Parts:

IC LM741 x1
T/C 10k,22k,100k   All x1
Triansistor BC148/548   x1
220uF/25V   x2                 
4.7uF/25V  x2
2.2uF/10V x1
10uF/25V x1
Small resistances x12p
Small PF    x5p

Automotive QVGA Time of Flight Sensor

I was searching about the MLX75 automotive sensor that suits to my project, which I planned to make and as well suitable for LED or lase illumination. I planned to use this MLX75 because it has up to 40 MHz sensor modulations and high ambient light robustness.

So after doing long day research about the project that I planned to make, I finally found this site which I think it can help me a lot when it comes to MLX75 because they explain it well and the function of it. I also understand that aside on automotive QVGA Time of Flight sensor of MLX75 it has also response range 800-900 nm.  You can check the details about automotive QVGA Time of Flight sensor, for you to read and understand the function of it as well as the additional features of the MLX75023 sensor.

MLX71120 and MLX71121

Few days ago I was created a circuit diagram using the 315MHz ASK transmitter IC (integrated circuit). This time I would like to study or doing some research about the RF receiver with a use of MLX71120 and MLX71121 RF receiver applications in a balanced loop antenna.

The good news is, after doing plenty of research about RF receiver using MLX71120 and MLX71121 I found this site of Melexis that explain well on the function and where to use this RF receiver. Upon reading and exploring the site I found out that using this MLX71120 and MLX71121 will need exact computation.

Check this RF receiver MLX71120and MLX71121 for your reference.