TLE7209-2R_07 Datasheet, PDF (7/32 Pages) Infineon Technologies AG – 7 A H-Bridge for DC-Motor Applications

TLE 7209-2R
Circuit Description
2.2.2 Temperature-depending Current Reduction
For T_ILR < T_j < T_SD the current limit decreases from I_L = 6.6 A ± 1.1 A to
I_L = 2.5 A ± 1.1 A as shown in Figure 4
A
6.6A
I_L
tolerance of temperature
dependent current
reduction
range of over-
temperature shut-down
2.5A
Tj
T_ILR
T_SD
°C
Figure 4 Temperature dependent current reduction
2.3
Protection
The TLE 7209-2R is protected against short circuits, overload and invalid supply voltage
by the following measures:
2.3.1 Short circuit to Ground
The high-side switches are protected against a short of the output to ground by an over
current shut-down. If a high-side switch is turned on and the current rises above the short
circuit detection current I_OUK all output transistors are turned off after a typical filter time
of 2 µs, and the error bit “Short Circuit to Ground on output 1 (2)”, SCG1 (SCG2) is stored
in the internal status register.
2.3.2 Short circuit to V_S
Due to the chopper current regulation, the low-side switches are already protected
against a short to the supply voltage. To be able to distinguish a short circuit from normal
current limit operation, the current limitation is deactivated for the blanking time t_b after
the current has exceeded the current limit threshold I_L. If the short circuit detection
current I_OUK is reached within this blanking time, a short circuit is detected (see
Figure 5). All output transistors are turned OFF and the according error bit “Short Circuit
to Battery on output 1 (2)”, SCB1 (SCB2) is set.
Data Sheet
7
Rev. 1.4, 2007-04-05