h bridge - please clear my doubts

[newbie111]

h bridge

http://www.pyroelectro.com/tutorials/l298_control/hardware.html


1001 = forward

(A)=1 a pnp transitor is connected there

shouldn't we apply a "o" to the base of transitor a to make it work then current will flow from the emitter to the collector?

I am confused.

Please clear my doubts

Thanks[http://www.pyroelectro.com/tutorials/l298_control/hardware.html
]

 

[hameeds01]

Re: h bridge

the diagram that is made on the given link is fake the actual internal circuit of L298 should look like this

 

[nashwan]

Re: h bridge

hi

in truth table
1 mean transistor on
0 mean transistor off

but in control side for transistor

0v----> for (A) or (b) mean pnp transistor on
12v---> for (A) or (b) mean pnp transistor off

12v---> for (c) or (d) mean npn transistor on
0v-----> for (c) or (d) mean npn transistor off

 

[hameeds01]

Re: h bridge

but infact there is no PNP transistors as shown in the Datasheet

 

[nashwan]

Re: h bridge

i think he ask about pnp transistor in that circuit

 

[nashwan]

Re: h bridge

i think he ask about pnp transistor in that circuit

 

[newbie111]

Re: h bridge

0v----> for (A) or (b) mean pnp transistor on
12v---> for (A) or (b) mean pnp transistor off

12v---> for (c) or (d) mean npn transistor on
0v-----> for (c) or (d) mean npn transistor off

YES this is what i want to know

thanks for helping, folks