STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Data Sheet

   

   

   

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 Doc ID 17713 Rev 1

Here after are summarized the primary features of the regulator(s):

–

Synchronous rectification

–

Automatic low side disabling when current in the inductance reaches 0 to optimize 
efficiency at low load

–

Pulse skipping control

–

Internally generated PWM

–

Cycle by cycle current limiting using internal current sensor

–

Protected against load short circuit

–

Soft start circuitry

–

Under voltage signal (both continuous and latched) accessible through serial 
interface.

Depending on the load current, there could be the necessity to add a Schottky diode on 
output to reduce internal thermal dissipation. This diode must be placed near to the pin and 
must be fast recovery and low series resistance type.

For detail about pulse skipping please refer to main switching regulator 

The output voltage will be externally set by a divider network connected on feedback pin. To 
reduce as much as possible the regulation voltage error L6460 has the possibility to switch 
between four regulator feedback voltage references (and, as a consequence, four under-

 

 

V

out

 

La 

V

supply

 

 

Half Bridge OUT 

C 

High

 

Side

 

Driver 

Control 

Logic 

Current

 

Sense

 

 

Charge pump Voltage

 

 GPIO USED as FB

 

Voltage  

Loop Control 

Regulator Ref 

- 

+ 

Under voltage 

Threshold 

Filter 

R

a

 

R

b

 

Low

 

Side

 

Driver 

From Central Logic 

Regulator Freq 

- 

+ 

To Central Logic 

Obtained using spare analo

g

/di

g

ital blocks 

Bridge Sense

 

Vref= 0.8V 

N.C. 

N.C. 

Vref=3V 

SelFBRef