Datasheet

L6460 Switching regulator controller
Doc ID 17713 Rev 1 53/139
Figure 12. Switching regulator controller functional blocks
13.1 Pulse skipping operation
Pulse skipping strategy has already been explained on main switching regulator section.
This regulator has 4 possible PWM duty cycles that can be changed writing in the
SelSwCtrPWM bits in the SwCtrCfg register using SPI.
V
out
La
V
suppl
y
C
Driver
Control
Logic
Current Sense
Charge pump Voltage
Volta ge
Loop Control
VFBRef
-
+
Under voltage
Threshold
Filter
R
a
R
b
From Central Logic
Regulator Freq
-
+
To Central Logic
under voltage flag
R
sense
V
SWDRV_gate
N-CH Fet
Analog Mux
Vref = 3 V
Vref=0.8V
SelFBRef[1:0]
Analog Mux
Uv Threshold 1
SelFBRef
Uv Threshold 2
Vref = 3V
Vref=0.8V
V
SWDRV FB
V
SWDRV SW
V
SWDRW_sns
Table 12. Switching regulator controller PWM specification
SwCtrCfg register Duty cycle value
Comments
SelSwCtrPWM[1:0] Typical
00 9%
01 12%
10 22.5% Default state
11 58%