L6911E

8/20

Figure 3. High Side driver peak current.

Vboot-Vphase=12V (left) Vboot-Vphase=5V (right) CH1 = High Side Gate CH4 = Inductor Current

Figure 4. Low Side driver peak current.

Vcc=12V (left) Vcc=5V (right)CH1 = Low Side Gate CH4 = Inductor Current

Monitor and Protection

The output voltage is monitored by means of pin 1 (VSEN). If it is not within

±10% (typ.) of the programmed

value, the powergood output is forced low.

The device provides overvoltage protection, when the output voltage reaches a value 17% (typ.) greater than

the nominal one. If the output voltage exceed this threshold, the OVP pin is forced high (5V) and the lower driver

is turned on as long as the over-voltage is detected. The OVP pin is capable to deliver up to 60mA (min) in order

to trigger an external SCR connected to burn the input fuse. The low-side mosfet turn-on implement this function

when the SCR is not used and helps in keeping the ouput low.

To perform the overcurrent protection the device compares the drop across the high side MOS, due to its

satisfied:

I

P

I

OCS

R

OCS

⋅

R

DSON

--------------------------------

=