TCM1060D 查看數據表（PDF） - Power Innovations Ltd

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TCM1060D

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS

Power Innovations Ltd 

TISP61060D, TISP61060P

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS

PROGRAMMABLE OVERVOLTAGE PROTECTORS

SEPTEMBER 1995 - REVISED SEPTEMBER 1997

TIP

WIRE

IC BASED

SLIC

PROTECTOR

SLIC

600 Ω

GENERATOR

SOURCE

RESISTANCE

600 Ω

R1

50 Ω

R2

50 Ω

RING

WIRE

A.C.

GENERATOR

0 - 600 Vrms

Th4

Th5

C1

IG

100 nF

ISLIC

IBAT

SWITCHING MODE

POWER SUPPLY

Tx

D2 C2

VBAT

D1

AI6XAD

Figure 2. SIMPLIFIED IC BASED SLIC PROTECTOR CIRCUIT

ic based protectors

In 1986, an IC based gated protector was proposed (A 90 V Switching Regulator and Lightning Protection

Chip Set, Robert K. Chen, Thomas H. Lerch, Johnathan S. Radovsky, D. Alan Spires, IEEE Solid-State

Circuits Conference, February 20, 1986, pp 178/9 and pp 340/1). Commercially, this resulted in the AT&T

Microelectronics LB1201AB device and the higher current Texas Instruments Inc. TCM1060 device

This implementation consisted of four diodes and two high holding current thyristors. Positive overvoltages on

the line wires are clipped to ground by forward conduction of the wire to ground diodes. Negative

overvoltages are initially clipped close to the SLIC negative supply rail, VBAT, by conduction of the thyristor

cathode-gate and gate series diode. This means that the protection voltage level for slow wave forms will be

about 1.5 V lower than the SLIC supply voltage. If sufficient current is available from the overvoltage, then the

thyristor will switch into a low voltage on-state condition. When the thyristor crowbars, the two series gate

diodes prevent the SLIC supply from being shorted to ground via the thyristor gate. As the overvoltage

subsides the high holding current of the crowbar prevents d.c. latchup (see Figure 1).

impulse protection performance

The impulse protection voltage will be the sum of the gate supply (VBAT) and the impulse peak gate-cathode

voltage (VGK(BO)). Capacitor C1 provides the pulse of gate current that occurs during fast rising impulses.

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 (e.g. 2/10), 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 can increase the

protection voltage. These voltages can be minimised by routing the SLIC connection through the protector as

shown in Figure 2.

a.c. protection performance

Figure 2 shows a typical a.c. power cross test circuit. A variable voltage a.c. source is applied to the line card

via 600 Ω series resistors. On the line card there are further series resistors R1 and R2. These resistors

provide over-current protection by fusing or going high resistance under high current a.c. conditions.

Figure 3 shows the gate and cathode a.c. power line cross voltage and current wave forms of the IC based

protector. Positive voltages are clipped at about +1 V by diode conduction. Negative voltages are clipped to

about -52 V as the SLIC supply voltage was -50 V. Sufficient current (200 mA) was available to cause the

PRODUCT INFORMATION

6

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