Datasheet

Switching regulator controller L6460
54/139 Doc ID 17713 Rev 1
13.2 Output equivalent circuit
The switching regulator controller output driving stage can be represented with an
equivalent circuit as in the Figure 13:
Figure 13. Switching regulator controller output driving: equivalent circuit
As can be seen from the above figure, the external switch gate is charged with a current
generator I
SOURCE
and it is discharged towards ground with a current generator I
SINK
that is
applied for a T
SINK
pulse while an equivalent resistor R
SUSTAIN
is connected between gate
and source until the sink command is present.
13.3 Switching regulator controller application considerations
This controller can implement a step-down switching regulator used to provide a regulated
voltage in the range 0.8 V – 32 V. Such kind of variation could be managed by considering
some constraints in the application and particularly by choosing the correct feedback
reference voltage as indicated in the Tabl e 1 3.
V
SWDRV_gate
VPUMP
I
SOURCE
V
SWDRV_SW
R
SUSTAIN
Source command
Sink pulse command
I
SINK
Sink command
Tsink
Table 13. Switching regulator controller application: feedback reference
Output regulated voltage range Feedback voltage reference
0.8V ≤ V
out
< 5V 0.8V - 1V
5V ≤ V
out
≤ 32V 2.5V - 3V