STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Fiche De Données
Codes de produits
EVAL6460
L6460 Main
switching
regulator
Doc ID 17713 Rev 1
51/139
Figure 11.
Main switching regulator functional blocks
In pulse skipping control the duty cycle must be chosen by the user depending on supply
voltage and output regulated voltage. Therefore the switching regulator has 4 possible duty
cycles that can be changed by writing the VmainSwSelPWM bits in the MainSwCfg register
according to following
voltage and output regulated voltage. Therefore the switching regulator has 4 possible duty
cycles that can be changed by writing the VmainSwSelPWM bits in the MainSwCfg register
according to following
.
The output current is limited to a value that can be set by means of SelIlimit bit in the
MainSwCfg register according to following
MainSwCfg register according to following
Table 10.
Main switching regulator PWM specification
MainSwCfg register
Duty cycle value
Comments
VmainSwSelPWM[1:0]
Typical
00
12%
01
15%
10
26%
Default state
11
63.5%
Table 11.
Main switching regulator current limit
SelIlimit
Current limit (min)
Comments
0
3.3A
Default state
1
2.3A
La
VSupply
C
High Side
Driver
Control
Logic
Current Sense
Charge pump Voltage
VSWmain_FB
Voltage
Loop Control
Regulator Ref
-
+
Under voltage
Threshold
Filter
R
a
R
b
From Central Logic
Regulator Freq
-
+
To Central Logic
Under voltage flag
VSWmain_SW