BTN7970 Datasheet, PDF (17/28 Pages) Infineon Technologies AG – High Current PN Half Bridge NovalithIC

High Current PN Half Bridge
BTN7970
Block Description and Characteristics
High Side Switch
90
85
80
75
70
65
T_j = -40°C
T_j = 25°C
T_j = 150°C
Low Side Switch
90
85
80
75
70
65
T = -40°C
j
T_j = 25°C
T_j = 150°C
60
6
8 10 12 14 16 18 20
V_S [V]
60
6
8 10 12 14 16 18 20
V_S [V]
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 BTN7970
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.
Data Sheet
17
Rev. 1.1, 2007-11-21