Protections

L6726A

14/35

Doc ID 12754 Rev 4

Figure 6.

OC threshold setting procedure timings (top) and waveforms (bottom)

7.3

Undervoltage lock out

In order to avoid anomalous behaviors of the device when the supply voltage is too low to

support its internal rails, UVLO is provided: the device will start up when VCC reaches

UVLO upper threshold and will shutdown when VCC drops below UVLO lower threshold.

The 4.1 V maximum UVLO upper threshold allows L6726A to be supplied from 5 V and 12 V

busses in or-ing diode configuration.

Figure 7.

OCP trip, default threshold, LS: STD38NH02L (left) UVLO turn off (right)

VCC

Enable Th

COMP

700mV

LGATE

PWM ramp

bottom edge

UVLO Th

R

Setting Procedure

VCC

Enable Th

COMP

700mV

LGATE

PWM ramp

bottom edge

UVLO Th

5.5ms - 6.5ms

R

Setting Procedure

t

DELAY

t

DELAY