TPD4113K

2006-11-01

11

Description of Protection Function

(1)

Over-current protection

This product incorporates the over-current protection circuit to protect itself against over-current at

startup or when a motor is locked. This protection function detects voltage generated in the current

output, which is on, temporarily shuts down after a dead time , preventing any additional current

from flowing to this product. The next all “L” signal releases the shutdown state.

(2)

Under-voltage protection

This product incorporates an under-voltage protection circuit to prevent the IGBT from operating in

outputs shut down regardless of the input. This protection function has hysteresis. When the

automatically restored and the IGBT is turned on/off again by the input.

turned on/off again by the input signal.

(3)

Thermal shutdown

This product incorporates a thermal shutdown circuit to protect itself against excessive rise in

temperature.When the temperature of this chip rises to the internal setting TSD due to external

causes or internal heat generation all IGBT outputs shut down regardless of the input. This

protection function has hysteresis (

ΔTSD = 50°C typ.). When the chip temperature falls to TSD −

ΔTSD, the chip is automatically restored and the IGBT is turned on/off again by the input.

Because the chip contains just one temperature-detection location, when the chip heats up due to the

IGBT, for example, the differences in distance between the detection location and the IGBT (the

source of the heat) can cause differences in the time taken for shutdown to occur. Therefore, the

temperature of the chip may rise higher than the initial thermal shutdown temperature.

Safe Operating Area

Note 1: The above safe operating areas are at Tj

= 135°C (Figure 1) and Tc = 95°C (Figure 2). If the temperature

exceeds these, the safe operation areas are reduced.

Note 2: The above safe operating areas include the over-current protection operation area.

0.83

Figure 1 SOA at Tj

= 135°C

Figure 2 SOA at Tc

= 95°C

0

450

0

0.9

0

450

0

400

0.9

400

1.0