# 12v battery charger circuit

#### Aplicant

Nov 16, 2016
18
Hi to all
My car battery is 55A lead acid battery.I want to charge my battery with smps battery charger with tl494
Battery charger can only outputs 10a, 14.4v
But i want 4a to charge battery
Have you got any battery charger circuits based on tl494
Please share them if you have

#### Harald Kapp

##### Moderator
Moderator
Nov 17, 2011
13,763
The current limit is typically set up by a sense resistor, cf. figure 9 in the TL494 datasheet. By changing the value of the sense resistor you can adjust the current limit (higher resistance, lower current and vice versa).

#### Aplicant

Nov 16, 2016
18
In figure 9 5v/10a=0.5ohm
If we put a load with 0.3ohm to this circuit,what happens? 5v/0.3ohm=16.66a
Can This circuit always give 10a to this load and does circuit work fine?

Last edited:

#### Aplicant

Nov 16, 2016
18

It can handle 200watt
For current limit i put 0.1 Rsense resistor for 10amper
Rsense drop voltage to pin 16 pin of tl494 and from ref 4k to 1 k to gnd for 1v to 15pin
Problem is that when i pul a load whose
resistance reach up to 9a my circuit works fine but when i put a load whose resistance reach up to 15a-16a,
My circuit doesnt work fine . It sounds chrrrrrrrrrr
I want 10a to both lower load and higher load i want to reduce noise

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