need help with desiging a 16v to 9v step down regulator

[o0tsubasa0o]

Im new to electronics , i currently have a project that needs me to design a step regulator circuit diagram .

Originally there is a 4 cell battery conntect to a motor for a sumo robot and there is also a 2 cell battery which connects to the micro controller card .

I was given a task to remove the 2 cell battery and use the 4 cell battery to power the motor and the micro controller card .

So i need to design a step down regulator ciruit . 4 cell battery (16V ) that connects to the motor and also to the micro controler card (9 V) by a Traco tsr-1 step down regulator .

**broken link removed**


the top part is the orginal one , while the 2nd part is the one i was ask to design

link for the regulator -> https://www.tracopower.com/fileadmin/medien/dokumente/pdf/datasheets/tsr1.pdf

can anyone help me with the disiging of the circuit and also what diode and capcitor to use ? tthx

 

[Hero999]

Microcontrollers normally require about 5V, so running one at 9V will either kill it, make it unreliable or drastically shorten its life.

The microcontroler card almost certainly has an on-board regulator, check the datasheet for its maximum power supply voltage. If it's under 16V then you need a regulator, but the current consumption will be low so it's probably not worth using an efficient switching regulator, the LM7808 will probably do.

 

[Reloadron]

According to the data sheet these units are direct replacements for 78xx series regulators. There is no need for a diode in the circuit, why do you mention a diode?

The data sheet shows a few circuit examples. Since you are working off a battery I would use maybe a 100 uF cap across the input and a .1 uF across the output. Looking up LM78xx circuits should give you some ideas. You really don't need much unless motors on the robot create a large amount of noise.

Ron

<EDIT> Morning Hero </EDIT>

 

[o0tsubasa0o]

thx for both of ur help i will read up on the LM7808 circuits and continue working on my project.

 

[Chippie]

Just buy a Ubec...designed for things like this...