[SOLVED] Switching ic required isntead of transistors

[anum_pirkani]

Switching IC required instead of transistors

HELLO...!!!

I am designing a circuit with +5V, -5V and 50V input analog voltages. Along with this, i have two switch control signals.
When one of the switch control signals is high, the 2 output ports should have approximately 5V and 50V respectively and when the other switch control signal is high, the output voltages should be reverted as in 50V and 5V respectively.

i have designed this circuit but it is using 10 transistors (NPN AND PNP) occupying large space. I was looking for an IC or so that can compact my circuit, but i am not sure which IC can fulfill my purpose.

Any help would be appreciated.

Thanks a lot
Regards.

 

[Vengateswaran]

what is the purpose of those 10 tranistors.. 2 transistor is required for switching control signals.. What for the remaining transistor have been used..??
can u please post your circuit.

 

[mathespbe]

Post your circuit...

 

[Venkadesh_M]

for replacing NPNs you can use ULN 2803, refer the current ratings...........

 

[anum_pirkani]

i am unable to post proteus design file, so i have uploaded the image.

 

[Vengateswaran]

Actually, reverting the output voltage is the only application or this circuit is used for any other applications....???

 

[Venkadesh_M]

Hi may I propose a design with 4 PNP and 4 diodes???

 

[embpic]

you can use TIP122 which is npn darlington pair transistor and you can switch that much voltage without problem or any IC. Because ULN2803 also don't have that much current rating.

 

[anum_pirkani]

Hi may I propose a design with 4 PNP and 4 diodes???

yeah definitely, i'll be really thankful to you...!!!

- - - Updated - - -

Actually, reverting the output voltage is the only application or this circuit is used for any other applications....???

this circuit is basically a small module attached with TxRx module.
when one of the switch control signal is high, transmitter portion of the main module is activated and when other control signal is high, receiver module is activated. So it basically directs the circulator.

- - - Updated - - -

you can use TIP122 which is npn darlington pair transistor and you can switch that much voltage without problem or any IC. Because ULN2803 also don't have that much current rating.

thankx a lot, i'll try to do this..!!!

 

[Venkadesh_M]

Hi here is it

And here is the proteus file make sure the power of transistor available

 

[anum_pirkani]

Hi here is it

And here is the proteus file make sure the power of transistor available

thnkx a lot for the design, it is perfectly switching.
i needed a switching topology in which, when one of the switch control signal is high, 1st voltmeter should read around 5v and other around 50v and when 2nd switch control signal is high, 1st voltmeter would give 50v and 2nd 5v.
these voltages furthur provide power to the next module, therefore it is important that i get both 5v and 50v for each control signal but in opposite order.

in case of the design you provided, i am getting 5v on both voltmeters for one signal and 50v on both voltmeters for other control signal...!!!

is there some way i can amend your design to get the desired output voltages as this design is much compact and economical than mine....

 

[Venkadesh_M]

Hi i cant get you these are the snap shots........

 

[anum_pirkani]

Hi i cant get you these are the snap shots........

greattt, i got the desired results...!!!
i interchanged q2 and q3 previously by mistake.

thanks a loads...

Regards

 

[Venkadesh_M]

Good but don forget to use the proper power transistor as per your requirement......

 

[keith1200rs]

A base-emitter resistor is always a good idea to ensure the transistors turn off.

Keith