BTAB STMicroelectronics Triacs datasheet, inventory, & pricing. BTAB 12A Triacs. DESCRIPTION Available either in through-hole or surface-mount packages, the BTA/BTB12 and T12 triac series is suitable for general. DESCRIPTION. Available either in through-hole or surface-mount packages, the BTA12, BTB12 and T12 triac series is suitable for general.
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Quadrant 4 operation occurs when the gate is positive and MT2 is negative with respect to MT1. This, in turn, causes the p, n and p layers over MT2 to behave like a PNP vta12, which turns on because its n-type base becomes forward-biased with respect to its emitter MT2.
This is because it is the only quadrant where gate current is injected directly into the base of one of the main device transistors.
BTASW SPC, CIRCUITO, A FUNçãO,BTASW STMicroelectronics PDF Datasheet-Data sheet
The turn-on is due to a parasitic capacitive coupling of the gate terminal with the MT2 terminal, which lets currents into the gate in response to a large rate of voltage change at MT2. Capacitor types Ceramic resonator Crystal oscillator Inductor Parametron Relay reed relay mercury switch. Quadrant 2 operation occurs when the gate is negative and MT2 is positive with respect to MT1.
The current and voltage are out of phase, so when the current decreases below nta12 holding value, the TRIAC attempts to turn off, but because of the phase shift between current and voltage, a sudden voltage step takes place between the two main terminals, which turns the device on again.
The turn-on of the device is three-fold and starts when the current from MT1 flows into the gate through the p-n junction under the gate. As current into the gate increases, the potential of the left side of the p-silicon under the gate rises towards MT1, since the difference in potential between the gate and MT2 tends to lower: When the gate current is discontinued, if the current between the two main terminals is more than what is called the latching currentthe device continues to conduct.
BTAB Datasheet(PDF) – Inchange Semiconductor Company Limited
The N region attached to MT2 is active, but the N region attached to Datashheet only participates in the initial triggering, not the bulk current flow. Generally, this quadrant is the most sensitive of the four. In many dataxheet this is sufficient to lower the impedance of the gate towards MT1.
A high rate of rise of the current between MT1 and MT2 in either direction when the device is turning on can damage or destroy the TRIAC even if the pulse duration is very short. In this case, the injection of holes in the p-silicon makes the stacked n, p and n layers beneath MT1 behave 60b0 a NPN transistor, which turns on due to the presence of a current in its base.
Triggering in this quadrant is similar to triggering in quadrant III. Snubber circuits are also used to prevent premature triggering, caused for example by voltage spikes in the mains supply. Views Read Edit View history.
Retrieved from ” https: These devices are made specifically for improved commutation and can often control reactive loads without the use of a snubber circuit. When used to control reactive inductive or capacitive loads, care must be taken to ensure that the TRIAC turns off correctly at the end of each half-cycle of the AC in the main circuit. When mains voltage TRIACs datashet triggered by microcontrollers, optoisolators are frequently used; for example optotriacs can be used to control the gate btta12.
The process happens in different steps here too. The minimum current able to do this is called gate threshold current and is generally indicated by I GT. Other applications with single polarity triggering from an IC or digital drive circuit operate in quadrants 2 and 3, than MT1 is usually connected to positive voltage e.
This is similar to the recovery in standard diodes: In other projects Wikimedia Commons. In addition, applying a trigger at a controlled phase angle of the AC in the main circuit allows control of the average current flowing into a load phase control. The equivalent circuit is depicted in Figure 4.
The TRIAC’s gate can be connected through an opto-isolated transistor, and sometimes a resistor to the microcontroller, so that bringing the voltage down to the microcontroller’s logic zero pulls enough current through the TRIAC’s gate to trigger it.
In particular, if the pulse width of the gate current is sufficiently large generally some tens of microsecondsthe TRIAC has completed the triggering process when the gate signal is discontinued and the latching current reaches a minimum level called holding current.
This in turn lowers the potential of the n-region, acting as the base of a pnp transistor which switches on turning the transistor on without directly lowering the base potential is called remote gate control. They are typically in the order of some milliamperes.
As in the case of a triggering in quadrant III, this lowers the potential of the n-layer and turns on the PNP transistor formed by the n-layer and the two p-layers next to it. The four quadrants are illustrated in Figure 1, and depend on the gate and MT2 voltages with respect to MT1. The process uses a remote gate control and is illustrated in Figure 7. In most applications, the gate current comes from MT2, so quadrants 1 and 3 are the only operating modes both gate and MT2 positive or negative against MT1.
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Generally, this quadrant is the least sensitive of the four daatasheet clarification needed Why is quadrant 4 the least sensitive? As forward-biasing implies the injection of minority carriers in the two layers datashret the junction, electrons are injected in the p-layer under the gate.
In these situations it is normal to connect the neutral terminal to the positive rail of the microcontroller’s power supply, together with A1 of the triac, with A2 connected to the live. Because each SCR will have an entire half-cycle of reverse polarity voltage applied to it, turn-off of the SCRs is assured, no matter what the character of the load. Suppose one wants to turn the inductor off: Because in the TRIAC there are parasitic resistances, a high reverse current in the p-n junctions inside it can provoke a voltage drop between the gate region and the MT1 datasehet which may make the Datasbeet stay turned on.
For triiodothyroacetic acid, see Tiratricol. Alternatively, where safety allows and electrical isolation of the controller isn’t necessary, one of the microcontroller’s power rails may be connected one of the mains supply. Other three-quadrant TRIACs can operate with smaller gate-current to be directly driven by logic level components. In this section, a few are summarized.
BTA12-600B TO-220 TRIAC
Therefore, the red arrow labeled with a “3” in Figure 6 shows the final conduction path of the current. This switches on a structure composed by an NPN transistor and a PNP transistor, which has the gate as cathode the turn-on of this structure daasheet indicated by “1” in the figure.
TRIACs may also fail to turn on reliably with reactive loads if the current phase shift causes the main dtasheet current to be below the holding current at trigger time.