STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Data Sheet
Product codes
EVAL6460
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.
SelSwCtrPWM bits in the SwCtrCfg register using SPI.
V
out
La
V
supply
C
Driver
Control
Logic
Current Sense
Charge pump Voltage
Voltage
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
An
al
og Mu
x
Vref = 3 V
Vref=0.8V
SelFBRef[1:0]
An
al
og Mu
x
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%