Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

5 Device description

L6732C

14/32

If an over current is detected during the soft-start phase, the device provides a constant-

current-protection. In this way, in case of short soft-start time and/or small inductor value and/or

high output capacitors value and so, in case of high ripple current during the soft-start, the

converter can start in any case, limiting the current (see section 4.6 Monitoring and protections)

but not entering in HICCUP mode. During normal operation, if any under-voltage is detected on

one of the two supplies, the SS pin is internally shorted to GND and so the SS capacitor is

rapidly discharged.

5.7

Driver section

The high-side and low-side drivers allow using different types of power MOSFETs (also multiple

time control avoids MOSFETs cross-conduction maintaining very short dead time duration in

the range of 20ns. The control monitors the phase node in order to sense the low-side body

diode recirculation. If the phase node voltage is less than a certain threshold (-350mV typ.)

during the dead time, it will be reduced in the next PWM cycle. The predictive dead time control

doesn't work when the high-side body diode is conducting because the phase node doesn't go

negative. This situation happens when the converter is sinking current for example and, in this

case, an adaptive dead time control operates.

Obsolete

Product(s)

- Obsolete

Product(s)