BTS7970B データシートの表示（PDF） - Infineon Technologies

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BTS7970B

High Current PN Half Bridge NovalithIC™

Infineon Technologies 

High Current PN Half Bridge

BTS 7970B

Block Description and Characteristics

High Side Switch

80

A

75

I CLH

70

Tj = -40°C

Tj = 25°C

T j = 150°C

65

Low Side Switch

80

A

75

I CLL

70

65

Tj = -40°C

Tj = 25°C

Tj = 150°C

60

6

8 10 12 14 16 18 V 20

VS

60

6

8 10 12 14 16 18 V 20

VS

Figure 11 Typical Current Limitation Detection Levels vs. Supply Voltage

In combination with a typical inductive load, such as a motor, this results in a switched

mode current limitation. That way of limiting the current has the advantage that the power

dissipation in the BTS 7970B is much smaller than by driving the MOSFETs in linear

mode. Therefore it is possible to use the current limitation for a short time without

exceeding the maximum allowed junction temperature (e.g. for limiting the inrush current

during motor start up). However, the regular use of the current limitation is allowed only

as long as the specified maximum junction temperature is not exceeded. Exceeding this

temperature can reduce the lifetime of the device.

4.3.5 Short Circuit Protection

The device is short circuit protected against

• output short circuit to ground

• output short circuit to supply voltage

• short circuit of load

The short circuit protection is realized by the previously described current limitation in

combination with the over-temperature shut down of the device.

Please note: Due to the higher priority of the overvoltage protection the short circuit

protection is inactive in overvoltage conditions.

Data Sheet

16

Rev. 2.0, 2006-05-09

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