Skip to main content

7805电压调节器IC

The7805电压调节器ICis a commonly used voltage regulator that finds its application in most of the electronics projects. It provides a constant +5V output voltage for a variable input voltage supply.

LM7805 Pinout Configuration

Pin Number

Pin Name

Description

1

Input (V+)

Unregulated Input Voltage

2

Ground (Gnd)

Connected to Ground

3

Output (Vo)

Outputs Regulated +5V

7805 Regulator Features

  • 5V Positive Voltage Regulator
  • Minimum Input Voltage is 7V
  • Maximum Input Voltage is 25V
  • Operating current(IQ) is 5mA
  • Internal Thermal Overload and Short circuit current limiting protection is available.
  • 结温最大125摄氏度
  • Available in TO-220 and KTE package

Note:Complete Technical Details can be found at the7805 datasheetgiven at the end of this page.

Other Voltage Regulators

LM7806,LM7809, LM7812,LM317,LM7905,LM7912,LM117V33,XC6206P332MR..

Brief Description of 7805 Voltage Regulator IC

Voltage regulators are very common in electronic circuits. They provide a constant output voltage for a varied input voltage. In our case the 7805 IC is an iconic regulator IC that finds its application in most of the projects. The name 7805 signifies two meaning, “78” means that it is a positive voltage regulator and “05” means that it provides 5V as output. So our 7805 will provide a +5V output voltage.

The output current of this IC can go up to 1.5A. But, the IC suffers from heavy heat loss hence a Heat sink is recommended for projects that consume more current. For example if the input voltage is 12V and you are consuming 1A, then (12-5) * 1 = 7W. This 7 Watts will be dissipated as heat.

7805 as +5V Voltage Regulator

This is a typical application circuit of the 7805 IC. We just need two capacitors of vale 33uf and 0.1uf to get this IC working.

7805 Voltage Regulator Circuit Diagram

输入电容器0.33UF是陶瓷电容器,可处理输入电感问题,输出电容器0.1UF也是电容器的陶瓷电容器。这些电容器应靠近终端放置,为它们有效地工作。它们也应该是陶瓷型,因为陶瓷电容器比电解更快。

7805作为可调输出稳压器

This IC can also act as an adjustable output voltage regulator, meaning you can also control the output voltage for your desired value using the below circuit.

7805作为输出稳压器电路图

Here, the input voltage can be anywhere between 9V-25V, and the output voltage can be adjusted using the value of resistance R1 and R2. The value can be calculated using the below formulae.

7805 voltage formulae

Where, Vxx=5, IQ = 5*10-3

7805应用程序

  • 恒定+ 5V输出稳压器到电源微控制器和传感器在大多数项目中188金宝搏官方网站
  • Adjustable Output Regulator
  • Current Limiter for certain applications
  • Regulated Dual Supply
  • Output Polarity-Reversal-Protection Circuit

2D model

7805 Voltage Regulator 2D Model

Related Post



加入20K +订阅者

We will never spam you.

*indicates required

成为我们不断增长的社区的一部分。