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TISP61089A Datasheet(PDF) 6 Page - Power Innovations Ltd |
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TISP61089A Datasheet(HTML) 6 Page - Power Innovations Ltd |
6 / 17 page TISP61089A DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS 6 JUNE 1999 P R OD U C T INF O RMA T ION operation of gated protectors Figures 4. and 5. show how the TISP61089A limits negative and positive overvoltages. Positive overvoltages (Figure 5) are clipped by the antiparallel diodes in the TISP61089A and the resulting current is diverted to ground. Negative overvoltages (Figure 4.) are initially clipped close to the SLIC negative supply rail value (VBAT). If sufficient current is available from the overvoltage, then the protector (Th5) will crowbar into a low voltage on-state condition. As the overvoltage subsides the high holding current of the crowbar prevents d.c. latchup. The protection voltage will be the sum of the gate supply (VBAT) and the peak gate-cathode voltage (VGK(BO)). The protection voltage will be increased if there is a long connection between the gate decoupling capacitor, C1, and the gate terminal. During the initial rise of a fast impulse, the gate current (IG) is the same as the cathode current (IK). Rates of 70 A/µs can cause inductive voltages of 0.7 V in 2.5 cm of printed wiring track. To minimise this inductive voltage increase of protection voltage, the length of the capacitor to gate terminal tracking should be minimised. Inductive voltages in the protector cathode wiring will also increase the protection voltage. These voltages can be minimised by routing the SLIC connection through the protector as shown in Figure 3. Figure 3. TISP61089A BUFFERED GATE PROTECTOR (SECTION 4.5.12 TESTING CONDITION) Figure 4. NEGATIVE OVERVOLTAGE CONDITION Figure 5. POSITIVE OVERVOLTAGE CONDITION R1 50 Ω Ω Ω Ω RING WIRE TIP WIRE SLIC TISP61089A V BAT C1 220 nF AI6XAGA 600 Ω Ω Ω Ω 600 Ω Ω Ω Ω A.C. GENERATOR 0 - 600 Vrms SWITCHING MODE POWER SUPPLY GENERATOR SOURCE RESISTANCE I BAT I G I SLIC C2 D1 Tx R2 50 Ω Ω Ω Ω Th4 Th5 C1 220 nF I G Th5 SLIC V BAT SLIC PROTECTOR TISP 61089A I K AI6XAHA Th5 SLIC V BAT SLIC PROTECTOR TISP 61089A C1 220 nF I F AI6XAIA |
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