Truly speaking it is a complete standalone voltage regulator. We only need to use two capacitors, one on the input and second one on the output of in order to achieve clean voltage output and even these capacitors are optional to use. To achieve 12V 1A current, should be mounted on a good heatsink plate. Thanks to the transistor like shape of which makes it easy to mount on a heatsink plate. In electronics markets, is sold under various names such as a, act, t and lm
|Published (Last):||11 September 2018|
|PDF File Size:||15.3 Mb|
|ePub File Size:||7.84 Mb|
|Price:||Free* [*Free Regsitration Required]|
Truly speaking it is a complete standalone voltage regulator. We only need to use two capacitors, one on the input and second one on the output of in order to achieve clean voltage output and even these capacitors are optional to use.
To achieve 12V 1A current, should be mounted on a good heatsink plate. Thanks to the transistor like shape of which makes it easy to mount on a heatsink plate. In electronics markets, is sold under various names such as a, act, t and lm All of them are almost identical with a little to no differences at all.
Exceeding the voltage range may damage the IC. Given bellow is pin diagram to make the pinout connections clear in case you want to do some experiments. If you hold upside down pins up and the IC number is facing you then the left pin will be the voltage regulator output, the center pin will be ground and the right pin will be the voltage input pin. Under my experience, the maximum safe current you can get from one IC is 1A. If you need more power then there are a few ways to do so.
More than one can be used in parallel in order to achieve more than 1A current but output voltage of each can slightly vary resulting in unbalanced load on all of them. This can result in load balancing issues and can damage the IC carrying most current. However there is a way to overcome this problem.
I have given bellow a schematic diagram in which two ICs are attached together and both of them are carrying almost equal load. At least the current difference is not too much to damage any IC. Both resistors should be minimum 15 Watt or above. This parallel circuit will provide 12V and approximately 2A current. You can increase number of but each additional will require a resistor on its output.
Following is the link to a simple but complete power supply circuit diagram developed using
Regulador de Tensão 7812 12V 1A para Projetos
In this post we learn how to boost current from these ICs using an outboard transistor circuit with a 78XX circuit. There are several options of pulling extra current from a 78XX type voltage regulator lC than it was original rating, however the majority of techniques have their down sides, In case, for example, a power transistor is attached in parallel with the IC, the supply voltage may not be safeguarded from short-circuits. That may, naturally, be dealt with with the addition of a current sensor in the form of an additional transistor that, while in overload situations, cuts off the base current for the power transistor. Nevertheless this particular remedy can experience great power loss in the course of short-circuit situations, that is not truly suitable either. The current booster circuit for , ICs offered in this article demonstrates that a less complicated solution might be achievable: the power transistor, T1, is presented with an emitter resistor! This successfully handles the problem, due to the fact the current via T1 is then proportionate to the current delivered through the voltage regulator. In case the 78XX regulator and T1 are attached onto the same heatsink, the transistor is additionally thermally guarded!
IC 7812 Voltage regulator Pin and Circuit Explained