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LM323T Arkusz danych(PDF) 6 Page - ON Semiconductor |
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LM323T Arkusz danych(HTML) 6 Page - ON Semiconductor |
6 / 8 page LM323, A 6 MOTOROLA ANALOG IC DEVICE DATA Figure 13. Current Regulator Figure 14. Adjustable Output Regulator Figure 15. Current Boost Regulator Figure 16. Current Boost with Short Circuit Protection 5.0 V R Input 0.33 µF LM323, A R IO The LM323,A regulator can also be used as a current source when connected as above. Resistor R determines the current as follows: IO = + IB ∆IB ^ 0.7 mA over line, load and temperature changes IB ^ 3.5 mA For example, a 2.0 A current source would require R to be a 2.5 Ω, 15 W resistor and the output voltage compliance would be the input voltage less 7.5 V. Constant Current to Grounded Load Input Output 1.0k 4 6 7 2 3 – + 0.1 µF 10k MC1741 VO, 8.0 V to 20 V The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The minimum voltage obtainable with this arrangement is 3.0 V greater than the regulator voltage. LM323, A 0.33 µF R 0.1 µF Output 1.0 µF The LM323, A series can be current boosted with a PNP transistor. The 2N4398 provides current to 15 A. Resistor R in conjuction with the VBE of the PNP determines when the pass transistor begins conducting; this circuit is not short circuit proof. Input–output differential voltage minimum is increased by the VBE of the pass transistor. 2N4398 or Equiv LM323, A LM323, A Input Rsc 2N4398 or Equiv. Output R MJ2955 or Equiv. 1.0 µF The circuit of Figure 16 can be modified to provide supply protection against short circuits by adding a short circuit sense resistor, RSC, and an additional PNP transistor. The current sensing PNP must be able to handle the short circuit current of the three–terminal regulator. Therefore, an 8.0 A power transistor is specified. Vin – VO ≥ 2.5 V |
Podobny numer części - LM323T |
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Podobny opis - LM323T |
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