Hello, readers welcome to the new post. Today we will discuss Introduction to L4940V5. It is a less voltage operating regulator that normally operates at five volts created by ST Microelectronics. its dropout volts is about four fifty millivolts for the one-ampere load. It is used for battery operation and enhances its operating life.
Its structure lies in TO-220 packaging and with that comes inner current and power dissipation limitation. In this post, we will cover its different parameters and functions. So let’s get started.
Introduction to L4940V5
- The L4940 V5 is a three-pin device that is called a positive regulator and comes in T0-220 packaging.
- It has many voltage ranges so used for different voltage applications.
- It is used for battery systems since has fewer power losses at input and output and increases the battery’s operating life. This module also has an inner current limiting circuit, anti-saturation circuit safe area protection, and thermal shutdown
L4940V5 Pinout
- It has three pins described here
- Input: Here input supply is provided
- GND: the ground is linked here
- Output: Output volts are getting from this point
L4940V5 Features
- The main features are discussed here
- Its quiescent current is five milliamperes
- The Peak current is about 2.25 ampers with two volts of differential
- It comes with overcurrent thermal and reverses volts protection circuits
- It has fewer dropout volts about four fifty millivolts
- Its output volts are five volts with ±10mV
L4940V5 Block diagram
Working of L4940V5
- It is fewer volts consuming about five-volt voltage regulator. Some voltage regulations require that their input must be larger than the output volts to get accurate regulation as output depends on the NPN configuration.
- In this voltage regulator, the output configuration is PNP which denotes that voltage drops from input to output so less volt loss can occur.
- It shows that the regulation device can work if input volts are high from the output. It is used for battery operations.
- These regulators can be unstable so output decoupling connects carefully.
L4940V5 Applications
- Its common applications are discussed here
- It used for battery power systems
- Used for voltage regulation
- Employed for linear output stage for SMPS
L4940V5 Absolute maximum ratings
Symbolic Representation | Features | Parameters |
Vi | Input VOlts | 30V |
VIR | Reverse Input volts | -15V |
Io | Output current | Limited at the inner side |
pD | Power Dissipation | Limited at inner side |
Tstg | The range for temperature storage | -40 to +150 C |
Top | Operating junction temperature range | -40 to +150 C |
Working of L4940V5
- L4940V5 is a low dropout voltage regulator that provides five-volt outputs. Since output is configured on the NPN stage most regulators get input voltage higher as compared to output voltage for providing accurate regulation results.
- The output stage of the low dropout regulator is PNP, which defines that VBE losses occur from input to output and helps to reduce dropout voltages.
- It means regulators operate if the input voltage is some hundred millivolts larger as compared to the output voltage.
- It is good to use for battery power devices since higher dropout voltages will waste high battery capacity.
- It is noted that low dropout regulators can be unstable, so output decoupling is done with accurate precaution. The regulators can oscillator if there is no decoupling
How does a 5V regulator work?
- Voltage regulators work with the use of negative feedback controls and come with a feed-forwarding design. The output voltage is stable and less than the input voltage produced with regulators. With that, it works as protection from voltage surges that can affect the circuit.
How does a 12V voltage regulator work?
- The voltage regulator is a circuit that makes and maintains fixed output voltage irrespective of changes to input voltage or load conditions. Voltage regulators keep the voltage of the power source in a range that is supported by different electrical components.
Are voltage regulators AC or DC?
- The voltage regulators do not transform AC to DC. The voltage regulator’s basic function is to make stale output voltage irrespective of variations in input voltage or load conditions. Voltage regulators work on DC inputs.
What are the four main parts of the voltage regulator?
- AC automatic voltage regulators come comeswith 4 parts, a power transformer, rectifier circuits, filter circuits, and voltage regulator circuits.
How to connect a voltage regulator?
- The positive of battery must connected with the VIn on a regulator, and the VOUT from the regulator must connected with power input on the controller and all 3 devices come with a shared ground connection.
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That is all about the L4940V5 all details has explained if you have a question ask it here