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LM358 Circuit: Linear DC Regulated Power Supply (With Example)

Author: Irene Date: 20 Feb 2021  1547

LM358 circuit

Introduction

In today's society, people enjoy the great convenience brought by electronic equipment. And everyone knows that electronic equipment has a common circuit - power circuit. The requirement of electronic equipment for power supply circuit is to be able to provide continuous and stable electric energy to meet the load requirements. And it is usually required to provide stable DC power. The power supply that provides this kind of stable DC power is the DC stabilized power supply. At the same time, protection is also an important part. Therefore, leakage protection device is also an inevitable circuit demand. Leakage protection device is a kind of grounding protection device which is used to prevent accidents caused by electric shock and electric leakage. When the leakage current of the circuit or electrical equipment is greater than the set value of the device, or people and animals get electric shock, it can quickly cut off the accident power supply. It can avoid the expansion of the accident scope, and ensure the safety of people and equipment. Therefore, this article uses LM358, field-effect transistor, and operational amplifier to design and produce a low dropout, wide range linear DC power supply.

Catalog

Introduction

I Design Scheme

1.1 Regulated Power Supply Circuit

1.2 Leakage Detection Circuit

1.3 Protective Shut-off Circuit

II System Analysis and Test

2.1 How to test regulated power supply circuit?

2.2 How to test Leakage protection circuit?

III Results and Analysis

IV Conclusion

Component Datasheet

FAQ

Ordering & Quantity

I Design Scheme

This system is mainly composed of DC voltage regulator module, leakage detection module, turn off protection module, etc.

1.1 Regulated Power Supply Circuit

As shown in Figure 1, this circuit module uses LM358 as a stable amplifier, and uses P-channel MOS tube. LM358 consists of two independent, high gain, internally frequency compensated operational amplifiers, which can stabilize the output at 5 ± 0.05 v when the input voltage changes from 5.5 V to 25 V.

Figure 1. circuit of regulated power supply

1.2 Leakage Detection Circuit

The device of leakage protection requires that when the input voltage is 5V, the output voltage is not less than 4.6V. The maximum voltage at both ends of resistor R1 is 0.4V. The current of the leakage protection circuit works at 250mV. It is calculated that R1 resistance should not be greater than 1.6Ω, so we choose 1Ω resistance as the detection resistance. As Figure 2 shows, connect a 1 Ω resistor in the circuit. The current can be calculated by detecting the voltage change at both ends of the resistor. A subtraction circuit is used to amplify the voltage because it is too small. The amplified signal is much larger than the input offset voltage. Then use a voltage comparator to determine the leakage current. This circuit is stable and reliable. After testing, it has reached a high accuracy of voltage detection.

Figure 2. circuit of Leakage Detection

1.3 Protective Shut-off Circuit

R1 is the detection resistance and adjust its value slightly. When the leakage current of the circuit is 30mA, the voltage difference between the two ends of R1 is amplified and sent to the base of triode. The triode is turned on; the relay K1 is closed, the load supply is disconnected. When the leakage fault is eliminated, press the reset button S1, and the circuit will return to the initial state.

Figure 3. Protective Shut-off Circuit

II System Analysis and Test

2.1 How to test regulated power supply circuit?

Load R is 5Ω. When the input voltage changes from 5.5 to 25V, record and measure the output voltage, and observe whether the result changes in the range of 5± 0.05V. Calculate the voltage regulation rate. Su=|Uo2一Uo1|/Uo2×100 (Uo1 is the output voltage when the input voltage is 5.5V, and Uo2 is the output voltage when the input voltage is 25V)

2.2 How to test Leakage protection circuit?

The regulated power supply removes the 5Ω load and switches to the leakage protection file. At this time, the working voltage is 5V. Then connect a 20Ω load and connect a 330Ω adjustable resistor in the analog branch. To observe the reliability and sensitivity of the leakage protection circuit, connect a digital multimeter in series to monitor the analog leakage branch current.

III Results and Analysis

The test results of voltage regulation rate are shown in the table below.

Test results of voltage regulation rate

Input voltage (V)

Load resistance (Ω)

Output voltage (V)

5.5

5

5.002

7

5

5.001

10

5

5.001

15

5

5.001

25

5

4.998

Result Analysis:

According to the test, when the branch current reaches 29.6 mA, the relay will pull in and self lock, and disconnect the load. Adjust the branch current to 26mA, then press the reset button, and the circuit will return to normal detection state. After repeated tests, the circuit is reliable and stable, and meets the requirements of safe use. The error absolute value of action current = | 30-29.6l/30 × 100% = 1.3%.

IV Conclusion

This article summarizes the design of a DC stabilized power supply and leakage protection system based on LM358. After repeated debugging, the experimental results show that the data error is within ±0.002v, which is far less than the allowable error of other regulated power supply on the market, and meets the design requirements. The system is stable and reliable, which can meet the various needs of users.


Component Datasheet

LM358 Datasheet


FAQ

  • What is lm358 op amp?

LM358 is a dual op-amp IC integrated with two op-amps powered by a common power supply. It can be considered as one half of LM324 Quad op-amp which contains four op-amps with common power supply. The differential input voltage range can be equal to that of power supply voltage.

  • What is lm358 used for?

LM358 can be used as transducer amplifier, DC gain block etc. It has large dc voltage gain of 100dB. This IC can be operated on wide range of power supply from 3V to 32V for single power supply or from ±1.5V to ±16V for dual power supply and it also support large output voltage swing.

  • Why lm358 is used in IR sensor?

IC Lm358 is used as a comparator when IR receiver senses IR radiations. When the o/p of lm358 goes high, then LED connected at the o/p turns ON. The output pin of the IC LM358 is used to interface with PIC microcontroller.

  • How does an lm358 work?

IC LM358– LM358 consists of two independent, high gain operational amplifiers in one package. Important feature of this IC is that we do not require independent power supply for working of each comparator for wide range of power supply. LM358 can be used as transducer amplifier, DC gain block etc.

  • What is the difference between lm358n and lm358p?

The suffix denotes the manufacturer's packaging code. The 'N' is used by most manufacturers for the plastic 8-pin package. The 'P' is used by a few manufacturers for the plastic 8-pin package. Raven Luni is right, there is NO difference between the two devices, just the mfgrs.

  • How do I know if my lm358 op amp is broken?

Measure the DC voltage at the +input. then measure the DC voltage at the output. if the results are significantly different, the opamp is most likely shot. if they are the same, the opamp is most likely ok and the problem is something else.

  • What is the difference between lm386 and lm358?

The LM386 is a complete audio power amplifier, the LM358 is a dual operational amplifier. When using the LM358 e.g. as a pre-amplifier, you will have to supply a separate power amplifier.

  • What is a dual op amp?

With a dual supply op amp, the V+ terminal of the op receives a positive voltage and the V- terminal connects to negative voltage. Therefore, any input signal fed into the op amp can swing from the positive voltage supply to the negative voltage supply.

  • What is LM series?

The following is a list of LM-series integrated circuits. ... The LM series originated with integrated circuits made by National Semiconductor. The prefix LM stands for linear monolithic, referring to the analog components integrated onto a single piece of silicon.

  • How to import lm358 into LTspice?

1. Download model file and unzip.
2. Place .cir file in same folder as schematic.
3. Place "opamp2" symbol on schematic.
4. Change "opamp2" value to LMX58_LM2904.
5. Place directive on schematic ". lib LMx58_LM2904. CIR" without quotes.

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
LM358ADR LM358ADR Company:Texas Instruments Remark:IC OPAMP GP 2 CIRCUIT 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:52500
Inquiry
Price:
2500+: $0.09540
5000+: $0.09010
12500+: $0.08215
25000+: $0.07685
62500+: $0.06890
Inquiry
LM358ADR2G LM358ADR2G Company:ON Semiconductor Remark:General Purpose Amplifier 2 Circuit 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $0.40000
10+: $0.30000
25+: $0.27080
100+: $0.14760
250+: $0.14268
500+: $0.12792
1000+: $0.09840
2500+: $0.08856
5000+: $0.08364
12500+: $0.07626
25000+: $0.07134
62500+: $0.06642
Inquiry
LM358ADT LM358ADT Company:STMicroelectronics Remark:IC OPAMP GP 2 CIRCUIT 8SO Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:7500
Inquiry
Price:
2500+: $0.11082
5000+: $0.10368
12500+: $0.09510
25000+: $0.09152
62500+: $0.08938
125000+: $0.08580
Inquiry
LM358AMX-NOPB LM358AMX-NOPB Company:Texas Instruments Remark:IC OPAMP GP 2 CIRCUIT 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:25000
Inquiry
Price:
2500+: $0.32940
5000+: $0.31720
12500+: $0.30500
25000+: $0.30012
62500+: $0.29280
Inquiry
LM358AN-NOPB LM358AN-NOPB Company:Texas Instruments Remark:IC OPAMP GP 2 CIRCUIT 8DIP Package:8-DIP (0.300", 7.62mm)
DataSheet
In Stock:3661
Inquiry
Price:
1+: $0.90000
10+: $0.80800
25+: $0.76720
100+: $0.58910
250+: $0.52060
500+: $0.49320
1000+: $0.38360
2500+: $0.36442
5000+: $0.35072
Inquiry
LM358D LM358D Company:Texas Instruments Remark:Operational Amplifiers - Op Amps Dual Linear Package:N/A
N/A
In Stock:On Order
Inquiry
Price:
1+: $0.41000
10+: $0.30100
100+: $0.16800
500+: $0.15400
1000+: $0.11600
2500+: $0.10900
5000+: $0.10200
10000+: $0.09400
25000+: $0.09000
Inquiry
LM358DR LM358DR Company:Texas Instruments Remark:IC OPAMP GP 2 CIRCUIT 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:52500
Inquiry
Price:
2500+: $0.08100
5000+: $0.07650
12500+: $0.06975
25000+: $0.06525
62500+: $0.05850
Inquiry
LM358DR2G LM358DR2G Company:ON Semiconductor Remark:IC OPAMP GP 2 CIRCUIT 8SOIC Package:8-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:37500
Inquiry
Price:
2500+: $0.08120
5000+: $0.07308
12500+: $0.06496
25000+: $0.06090
62500+: $0.05481
Inquiry
LM358DT LM358DT Company:STMicroelectronics Remark:IC OPAMP GP 2 CIRCUIT 8SO Package:SOIC8
DataSheet
In Stock:92500
Inquiry
Price:
2500+: $0.10296
5000+: $0.09724
12500+: $0.08866
25000+: $0.08294
62500+: $0.07436
125000+: $0.07150
Inquiry
LM358M LM358M Company:Texas Instruments Remark:General Purpose Amplifier 2 Circuit 8-SOIC Package:8-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $1.23000
10+: $1.10300
25+: $1.04720
100+: $0.80410
250+: $0.71060
500+: $0.67320
1000+: $0.52360
2500+: $0.49742
5000+: $0.47872
Inquiry

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