Application information

VNH5050A-E

22/33

Doc ID 16009 Rev 11

In any case, when a fault is detected, the faulty leg of the bridge is latched off. To turn on the

respective output (OUTX) 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: INA if ENA = 0 or INB if ENB =0)

- Pull low all inputs, PWM and Diag/EN pins within tDEL.

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 VCC pin

–

An N-channel MOSFET connected to the GND pin (see Figure 11)

–

A P-channel MOSFET connected to the VCC pin

The device sustains no more than -25 A in reverse battery conditions because of the two

body diodes of the Power MOSFETs. Additionally, in reverse battery condition the I/Os of

VNH5050A-E is pulled down to the VCC line (approximately -1.5 V).