Adjustable Voltage Regulator

Posted by Janell A. Bueno in Adjustable
Adjustable Voltage Regulator - l7912cv as well as 2 together with rpi 5v psu construction in addition 3a adjustable power supply furthermore confusion about lm431 adjustable precision zener shunt regulator furthermore 5a power supply 12v 25v adjustable with moreover 7805 furthermore high power supply regulater 0 30v 20a by lm338 further regulator 0 30v 1a by transistor c1061 further adjustable 1 3 22v regulated power supply furthermore 481322278906502063 also crowbar circuit further switching power supply electronic together with e car2 3 together with 12 volt adjustable power supply circuit lifier as well as creating a high current lm317 regulator moreover lm337 resistor and voltage calculator. moreover
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Adjustable Voltage Regulator

Adjustable Voltage Regulator, moreover l7912cv as well as 2 together with rpi 5v psu construction in addition 3a adjustable power supply furthermore confusion about lm431 adjustable precision zener shunt regulator furthermore 5a power supply 12v 25v adjustable with moreover 7805 furthermore high power supply regulater 0 30v 20a by lm338 further regulator 0 30v 1a by transistor c1061 further adjustable 1 3 22v regulated power supply furthermore 481322278906502063 also crowbar circuit further switching power supply electronic together with e car2 3 together with 12 volt adjustable power supply circuit lifier as well as creating a high current lm317 regulator moreover lm337 resistor and voltage calculator. Switching Power Supply Electronic furthermore Creating A High Current Lm317 Regulator additionally 5a Power Supply 12v 25v Adjustable With besides E car2 3 further Confusion About Lm431 Adjustable Precision Zener Shunt Regulator.
Adjustable Voltage Regulator, Switching Power Supply Electronic furthermore Creating A High Current Lm317 Regulator additionally 5a Power Supply 12v 25v Adjustable With besides E car2 3 further Confusion About Lm431 Adjustable Precision Zener Shunt Regulator. moreover l7912cv as well as 2 together with rpi 5v psu construction in addition 3a adjustable power supply furthermore confusion about lm431 adjustable precision zener shunt regulator furthermore 5a power supply 12v 25v adjustable with moreover 7805 furthermore high power supply regulater 0 30v 20a by lm338 further regulator 0 30v 1a by transistor c1061 further adjustable 1 3 22v regulated power supply furthermore 481322278906502063 also crowbar circuit further switching power supply electronic together with e car2 3 together with 12 volt adjustable power supply circuit lifier as well as creating a high current lm317 regulator moreover lm337 resistor and voltage calculator.
9.4.5 Temperature Stability Factor (St) 95 9.4.6 Ripple Rejection 96 9.5 Basic Voltage Regulator 9 6 9.6 Types of Voltage Regulators 9 6 9.6.1 Shunt Voltage Regulator 97 9.6.2 Series Voltage Regulator 97 9.7 Comparison of Shunt and Series Regulators 9 8 9.8 Voltage Follower Regulator using Opamp 9 9 9.8.1 Performance Parameters 910 9.9 Adjustable Output Regulator 9 12 9.9.1 Performance Parameters 913 9.10 Precision Voltage Regulator 9 16 9.10.1 Satisfying 3) Improved reliability for the power supply using these regulators. Thus, adjustable voltage regulators have become more popular because of their versatility, performance, and reliability. The LM317 is the most widely used adjustable voltage regulator series. 10.13.1 Connection

Diagram.of LM317 Regulator The typical connection diagram of LM317 regulator is shown in the Fig. 10.23. The LM317 requires only two external resistances Rj and R2, to set the required output voltage.5.8 Series Regulator using Opamp 511 5.9 Limitations of Discrete Regulators 512 5.10 Advantages of IC Voltage Regulators 513 5.11 Classification of IC Voltage Regulators 5 13 5.12 Three Terminal Fixed Voltage Regulators 513 of IC Linear Regulators 515 5.12.3 IC Series of Three Terminal Fixed Voltage Regulators 516 5.12.4 Typical Connection of IC 7805 Regulator 517 5.12.5 Positive 5 V Power Supply using IC 7805 517 5.12.6 Adjustable Regulator using 78XX The original IC to employ this concept was the LM317, a positive regulator. The

device.produces a fixed reference voltage of 1.25 V, appearing between the VOUT and ADJ pins of the IC. External scaling resistors set up the desired output voltage, adjustable in the range of 1.25 V–30 V. A complementary device, the LM337, operates in similar fashion, regulating negative voltages. An application example using standard adjustable three terminal regulators to implement a ±15 V linear 6.33 Three Terminal Adjustable Regulator : LM 317 Besides fixed voltage regulators, IC voltage regulators are available which allow the adjustment of the output voltage. The output voltage can be adjusted from 1.2 V to as high as 57 V with the help of such regulators. In such regulator ICs the common terminal plays the role of control

input.and hence called as ADJUSTMENT (ADJ) terminal. The LM317 series is the most commonly used three terminal adjustable regulators.Then I attached that to an LM1117T ADJ variablevoltage regulator circuit with a potentiometer to output any voltage from 11 V down to 1.25 V. I then fed the output of the LM1117 to the voltage regulator circuit being tested. I used two multimeters (see Figure 78). One multimeter displayed the output voltage of the LM1117 variable regulator to guide the precise adjustment of the “unregulated input voltage” being supplied to the voltage regulator under test. The second multimeter The maximum current that can be obtained by using a 7805 regulator is 1A. Assuming VEB (ON) = 0.7V and ft 12 for the

transistor,.IL = 1 (12 + 1) 12 x — = 11.8A Example 8.3 Referring to Fig. 8.11, assume VEB fon) = 0.7V and ft = 50. Determine the output current 10 and lc for a load of (a)100 £2 , (b) 2 ft in a regulator circuit using 1C 7805. Solution 5V (a) Load Current 1L = = 50mA Voltage across Rj = 50 mA x 7Q = 350m V. Since a minimum of 0.7V is required to switch a transistor 724 Simple 5V fixed regulator 725 Simple 5V adjustable regulator 726 Improved linearcurrent regulator 727 Highstability linear regulator 728 3A positive fixedvoltage regulator 729 Positive adjustablevoltage regulator 730 3A positive fixedcurrent regulator 731 3A positive adjustablecurrent regulator 732 1.5 A positive fixedvoltage regulator 733 1.5A positive

adjustablevoltage.regulator 734 1.5A positive fixedcurrent regulator 735 1.5A positive adjustablecurrent VREG ~> + o V|N POSITIVE REGULATOR COM OUT < GND "= 'L O VOUT IV,N MUST FLOAT) Figure 3.2. Positive Regulator in Negative Configuration (V^ Must Float) IV|M MUST FLOATI + o O+ VquT V|N o VREG Figure 3.3. Negative Regulator in Positive Configuration (Vjpj Must Float) 3.2 FIXED VERSUS ADJUSTABLE REGULATORS A proliferation of fixed threeterminal voltage regulators offered in various current ranges are currently available from most major integrated LINEAR REGULATOR S Positive Voltage Regi lators LM105 H Adjustable Voltage Regulator 883/SMD 596289588 LM109 H 5V Regulator, l0 = 20 mA 883/JAN /10701BXA LM109 K 5V

Regulator,.l0 = 1A 883/JAN /10701BYA LM117 H,E,K Adjustable Regulator 883/JAN /11703./11704 LM117HV H Adjustable Regulator, l0 = 0.5A 883/SMD 7703402XA LM117HV K Adjustable Regulator, l0 = 1.5A 883/SMD 7703402YA LM123 K 3A Voltage Regulator 883 — LM138 K 5A Adjustable 

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