The relay coil energizes, closing the N/O contacts, which in turn latches and sticks to the position even after the push button is released. Now when the shown push button is momentarily pushed, the N/O contacts are bypassed allowing the current to flow across the relay coil. N/O means normally open, that means the contacts are open initially, which in turn keeps the output disconnected from the positive of the power supply. These contacts are also terminated as the output of the unit. Referring the circuit diagram, we see that a relay is connected directly to the output of the power supply DC output, however the connection is made through the N/O contacts of the relay. A single relay is used for sensing as well as tripping the output from the involved malfunction. There are various electronic circuits that might be employed with a power supply unit for checking this problem, however these circuits sometimes themselves are at risk of getting damaged due to the limitations with many electrical parameters.Ī very innovative way of rectifying this problem has been shown in this article. The biggest enemy of all power supply units is a possible short circuit that might occur at its output terminals due to an accidental connection or due to the fault with the connected load. Though today all of us use hi-tech power supply units having built-in protection, there are folks who still rely on ordinary types of power supply units with no protection facility. NPN and PNP transistors are interchangeable if you remember one simple rule: A bipolar transistor is essentially two back-to-back diodes with the base being the common connection. On the left is an NPN (negative-positive-negative) transistor and on the right is a PNP (positive-negative-positive) transistor.A power supply unit is an indispensable unit for every electronic enthusiast and engineers working in the relevant field. ③ Are NPN and PNP transistors interchangeable? ② What is the DC current gain in TIP3055?ĭC Current Gain – hFE = 20-70 IC = 4.0 Adc Its corresponding PNP transistor is TIP2955.
#2n3055 transistor t220 series
It is the best device for power swapping circuits, parallel and series controllers (regulators), output phases and high power amplifiers. TIP3055 is a silicon epitaxial-ignoble NPN transistor, which is assembled in TO-218 malleable parcels. Note: Please check their parameters and pin configuration before replacing them in your circuit. On the process side ST is leading the way with advanced FD-SOI (Fully Depleted Silicon-on-Insulator) technology. STMicroelectronics is the result of the 1987 marriage between famed semiconductor companies SGS Microelettronica of Italy and Thomson-CSF Semiconductor of France. In an application such as power supplies, the metal are the most recommended. Heavy envelope are better because dissipate more heat as well. Also note that there are 2N3055 in lightweight aluminum housings and heavy metal casing. Thus, an assembly in which the transistor will work at the limit, the metallic type is also as indicated. The electrical characteristics of the two transistors are the same, however, by its casing, the metal 2N3055 has a slightly greater ability to dissipate heat. The TIP2955 is a complementary PNP transistor for the TIP3055. It is related to the load.įollowings are TIP3055 Symbol, Footprint, and 3D Model. The collector is for the current inside drive. The base administers the biasing of the transistor. The emitter is for an external drive of current. These are the main pinout TIP3055 which are well-defined beneath. For low distortion complementary designs.Video: High current DC voltage regulator (TIP3055+LM317T)