STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Data Sheet
Product codes
EVAL6460
L6460
Power bridges
Doc ID 17713 Rev 1
73/139
14.1.6
Synchronous buck regulator configuration (Bridge 3)
Bridge 3 can be configured to be used as 2 independent synchronous buck regulators or as
a single high current synchronous buck regulator using GPIOs pins in order to close the
voltage loop. The resulting regulator(s) will implement a non linear, pulse skipping, control
loop using an internally generated PWM signal. The voltage will be set externally with a
divider network and PWM duty cycle that can be programmed in order to ensure a proper
regulation.
a single high current synchronous buck regulator using GPIOs pins in order to close the
voltage loop. The resulting regulator(s) will implement a non linear, pulse skipping, control
loop using an internally generated PWM signal. The voltage will be set externally with a
divider network and PWM duty cycle that can be programmed in order to ensure a proper
regulation.
The regulator will be enabled/disabled using serial interface and will implement a soft start
strategy similar to that used by primary switching regulator.
strategy similar to that used by primary switching regulator.
Table 27.
Stepper fast decay
MixDecPhX[4:0]
Fast decay percentage
during off time
Unit
Typ
00000
0
%
00001
6.25
%
00010
12.5
%
00011
18.75
%
00100
25
%
00101
31.25
%
00110
37.6
%
00111
43.75
%
01000
50
%
01001
56.25
%
01010
62.5
%
01011
68.75
%
01100
75
%
01101
81.25
%
01110
87.5
%
01111
93.75
%
1xxxx
100
%