Le L293


The Motor Driver 



 1.3.UnitÚs ; Formules

Notes on Pulse Width Modulation


Click Here For Data Sheet.
Right click on the PDF Icon for the L293B and select 'save target as'


The L293 Dual Bridge Motor Driver IC Pinouts.

Vss = Logic Supply  = 4.5V to 36V 

Vs = Motor Driver Supply = Vss to 36V

Although Vs is recommended to be equal or greater than Vss I've had no adverse affects using Vss = 5V and Vs = 3.6V to 4V. Well not to date anyways. ;)

Total Power Dissipation at Tground-pins =80 o C = 5 W

From this the maximum current can be derived: 

If V = 3.6 Volts and P = 5 Watts

So from    P = VI (Power = Volts x Current)

                  I = P / V  = 5 / 3.6 = 1.4 Amps

As the motor draws approx 0.8 Amps at maximum efficiency, this leaves 0.6 Amps for overhead.












1.6. Utilisations


Examples of use:

Note: BugBot uses the bi-directional mode as shown on the left hand side of the IC.
The right hand side show methods for mono-directional connection. Top right shows active high and bottom right shows active low.




The selected mode of operation for BugBot bi-directional Bridge Driver with control line info. Or if you prefer the Truth Table:










2.2.Formules +









Suite vers LT