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TCM1060D Datasheet(PDF) 7 Page - Power Innovations Ltd |
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TCM1060D Datasheet(HTML) 7 Page - Power Innovations Ltd |
7 / 14 page 7 SEPTEMBER 1995 - REVISED SEPTEMBER 1997 TISP61060D, TISP61060P DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS PRODUCT INFORMATION thyristor to switch into the low-voltage on-state condition. At the end of the negative half cycle, the thyristor switches off when the current falls below the holding current value (300 mA). Switch-off and re-clipping at -52 V causes a second pulse of gate current. The wire current drawn by the protector is quasi-sinusoidal During the positive a.c. voltage period (diode clipping) there is no gate current. During the negative a.c. voltage period there are two triangular pulses of gate current, which peak at about 80 mA. This is current which flows into the gate terminal as indicated by the IG current arrow in Figure 2. This direction of current charges the VBAT supply. This would not be a problem if the VBAT supply was a rechargeable battery. However, often the supply is generated from a switching mode power supply or the SLIC supply feed has a series diode which blocks reverse (charging) current flow to the battery. In these cases the supply can only sink current in the direction shown by the IBAT arrow in Figure 2. Unless the SLIC current, ISLIC, is equal or greater than IG the value of VBAT will increase, possibly to a level which causes destruction of the SLIC. The maximum average value of IG occurs when the thyristor only clips the voltage and the peak cathode current is just beginning to approach the switching (IS) value, see Figure 4. The average current is maximised under high source impedance conditions (e.g. 600 Ω). In the case of the LB1201AB, it is recommended that the supply should be able to absorb 700 mA of “wrong way” current. If the supply cannot absorb the current then a shunt breakdown diode is recommended to provided a path for the gate current to ground (D2 in Figure 2). High power diodes are expensive, so diode D2 is usually low power, purposely selected to fail under this a.c. condition and protect the SLIC. Figure 3. IC PROTECTOR POWER CROSS WAVE FORMS Time - ms 0 5 10 15 20 -750 -500 -250 0 250 500 750 -100 -75 -50 -25 0 25 50 75 100 Time - ms 0 5 10 15 20 -60 -50 -40 -30 -20 -10 0 10 V G V K I K I G AI6XAG |
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