Data Sheet

17

Rev. 1.0, 2009-03-31

High Current PN Half Bridge

BTN7975B

Block Description and Characteristics

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.This

method of limiting the current has the advantage of greatly reduced power dissipation in the BTN7975B compared

to driving the MOSFET 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 as long as the specified maximum junction

temperature is not exceeded. Exceeding this temperature can reduce the lifetime of the device.

5.3.5

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.

High Side Switch

V

60

65

70

75

80

85

90

6

8

10

12

14

16

18

20

T

T

T

60

65

70

75

80

85

90

6

8

10

12

14

16

18

20

T

T

T

Low Side Switch

V