Can I run the L293D with another VCC1 as source ?

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1

Hello falks. I am running the L293D with an ESP8266-12E (3.3V).

The datasheet though, says that the VCC1 Pin require at least 4.5V. But the ESP has 3.3V. But it still works with a 3.3V VCC1.

The problem is: maybe it will be broken if I power it up for a longer time. Therfore, I wanna ask you:

Can I use the main power source to reach the 4.5V ?

To understand my question, you have to look the the two shematics here

Shematic 1
Shematic 1969×790 10.7 KB

Shematic 2
Shematic 2969×790 10.8 KB

2

The relevant parameters in the L293D datasheet are VIH and VIL.

Assuming that the VOH of the ESP8266 is greater than the minimum VIH (2.3V) of the L293D and the VOL of the ESP8266 is less than the maximum VIL (1.5V) of the L293D, it will work.

I think that your second schematic will work and you can easily check the output voltages of the ESP8266 with a multimeter.

1 Like
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Thank you my friend. Indeed, it works for months now without any issues. Thanks.

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