btn7970 Infineon Technologies Corporation, btn7970 Datasheet - Page 17

• Manufacturer Part Number: btn7970
• Description: High Current Pn Half Bridge Novalithic?
• Manufacturer: Infineon Technologies Corporation

Figure 11
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
The device is short circuit protected against
•
•
•
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
output short circuit to ground
output short circuit to supply voltage
short circuit of load
High Side Switch
90
80
60
85
70
65
75
6
Typical Current Limitation Detection Levels vs. Supply Voltage
Short Circuit Protection
8
10
12
14
T
T
T
j
j
j
= -40°C
= 25°C
= 150°C
16
V
18
S
[V]
20
17
Low Side Switch
90
80
60
85
70
65
75
6
8
Block Description and Characteristics
High Current PN Half Bridge
10
12
14
T
T
T
j
j
j
Rev. 1.1, 2007-11-21
= -40°C
= 25°C
= 150°C
16
V
18
S
BTN7970
[V]
20