L6920DB

Detailed description

9/16

Considering that current in the inductor is limited to 800mA, the maximum load current is

defined by the following relationship:

Equation 1

Where

Figure 8.

5.2

Start-up

One of the key features of L6920DB is the startup at supply voltage down to 0.8V (please

see the diagram in Figure 4).

The device leaves the startup mode of operation as soon as Vout goes over 1.4V. During

startup, the synchronous switch is off and the energy is transferred to the load through its

intrinsic body diode.

lengthened. Current limit and zero crossing detection are still available.

I

LOAD_LIM

V

in

V

out

-----------

I

LIM

T

OFF_MIN

V

out

V

in

–

2L

⋅

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

⋅

–

⎝⎠

⎛⎞

η

⋅⋅

=