L6460 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6460' PDF : 139 Pages View PDF
Switching regulator controller
L6460
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
VPUMP
I SOURCE
Source command
Tsink
Sink pulse command
Sink command
I SINK
RSUSTAIN
V SWDRV_gate
V SWDRV_SW
As can be seen from the above figure, the external switch gate is charged with a current
generator ISOURCE and it is discharged towards ground with a current generator ISINK that is
applied for a TSINK pulse while an equivalent resistor RSUSTAIN 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 Table 13.
Table 13. Switching regulator controller application: feedback reference
Output regulated voltage range
Feedback voltage reference
0.8V ≤ Vout < 5V
5V ≤ Vout ≤ 32V
0.8V - 1V
2.5V - 3V
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Doc ID 17713 Rev 1
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