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MBRB30H60CTT4G Datasheet(PDF) 5 Page - ON Semiconductor |
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MBRB30H60CTT4G Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 10 page MBRB30H60CT−1G, MBR30H60CTG, MBRF30H60CTG, MBRB30H60CTT4G, NRVBB30H60CTT4G, MBRJ30H60CTG http://onsemi.com 5 MERCURY SWITCH VD ID DUT 10 mH COIL +VDD IL S1 BVDUT IL ID VDD t0 t1 t2 t Figure 11. Test Circuit Figure 12. Current−Voltage Waveforms The unclamped inductive switching circuit shown in Figure 11 was used to demonstrate the controlled avalanche capability of this device. A mercury switch was used instead of an electronic switch to simulate a noisy environment when the switch was being opened. When S1 is closed at t0 the current in the inductor IL ramps up linearly; and energy is stored in the coil. At t1 the switch is opened and the voltage across the diode under test begins to rise rapidly, due to di/dt effects, when this induced voltage reaches the breakdown voltage of the diode, it is clamped at BVDUT and the diode begins to conduct the full load current which now starts to decay linearly through the diode, and goes to zero at t2. By solving the loop equation at the point in time when S1 is opened; and calculating the energy that is transferred to the diode it can be shown that the total energy transferred is equal to the energy stored in the inductor plus a finite amount of energy from the VDD power supply while the diode is in breakdown (from t1 to t2) minus any losses due to finite component resistances. Assuming the component resistive elements are small Equation (1) approximates the total energy transferred to the diode. It can be seen from this equation that if the VDD voltage is low compared to the breakdown voltage of the device, the amount of energy contributed by the supply during breakdown is small and the total energy can be assumed to be nearly equal to the energy stored in the coil during the time when S1 was closed, Equation (2). WAVAL [ 1 2 LI 2 LPK BVDUT BVDUTVDD WAVAL [ 1 2 LI 2 LPK EQUATION (1): EQUATION (2): |
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