Datasheet

Application information VNH5180A-E
20/31 Doc ID 17074 Rev 6
In any case, when a fault is detected, the faulty leg of the bridge is latched off. To turn on the
respective output (OUT
X
) again, the input signal must rise from low to high level.
Figure 12. Behavior in fault condition (how a fault can be cleared)
Note: In case of the fault condition is not removed, the procedure for unlatching and sending the
device in Stby mode is:
- Clear the fault in the device (toggle: IN
A
if EN
A
= 0 or IN
B
if EN
B
=0)
- Pull low all inputs, PWM and Diag/EN pins within t
DEL
.
If the Diag/En pins are already low, PWM = 0, the fault can be cleared simply toggling the
input. The device enters in stby mode as soon as the fault is cleared.
3.1 Reverse battery protection
Three possible solutions can be considered:
– A Schottky diode D connected to V
CC
pin
– An N-channel MOSFET connected to the GND pin (see Figure 11: Typical
application circuit for DC to 20 kHz PWM operation short circuit protection)
– A P-channel MOSFET connected to the V
CC
pin
The device sustains no more than -15 A in reverse battery conditions because of the two
Body diodes of the Power MOSFETs. Additionally, in reverse battery condition the I/Os of
VNH5180A-E is pulled down to the V
CC
line (approximately -1.5 V).