TISP61089SDR View Datasheet(PDF) - Power Innovations

Part Name

Description

MFG CO.

TISP61089SDR

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS

Power Innovations 

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TISP61089S

DUAL FORWARD-CONDUCTING P-GATE THYRISTORS

PROGRAMMABLE OVERVOLTAGE PROTECTORS

JULY 1999

TIP

WIRE

600 Ω

GENERATOR

SOURCE

RESISTANCE

600 Ω

R1

50 Ω

R2

50 Ω

RING

WIRE

A.C.

GENERATOR

0 - 600 Vrms

TISP61089S

Th4

SLIC

Th5

IG

C1

220 nF

ISLIC

IBAT

SWITCHING MODE

POWER SUPPLY

Tx

C2

VBAT

D1

AI6XAZ

Figure 3. TISP61089S BUFFERED GATE PROTECTOR (SECTION 4.5.12 TESTING CONDITION)

operation of gated protectors

Figures 4. and 5. show how the TISP61089S limits negative and positive overvoltages. Positive overvoltages

(Figure 5) are clipped by the antiparallel diodes in the TISP61089S 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 line to SLIC connection via the protector.

SLIC

PROTECTOR

SLIC

SLIC

PROTECTOR

SLIC

IK

Th5

AI6XBZ

TISP

IG

61089S

C1

220 nF

VBAT

Figure 4. NEGATIVE OVERVOLTAGE CONDITION

IF

Th5

TISP

61089S

C1

VBAT

220 nF

AI6XCA

Figure 5. POSITIVE OVERVOLTAGE CONDITION

PRODUCT INFORMATION

6

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