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

L6460 includes three internal regulators used to provide a regulated voltage to internal 
circuits.

The internal regulators are the following:

- V

SupplyInt

 regulator.

- Charge pump regulator.

- V

3v3

 regulator.

V

SupplyInt

 is the output of an internal regulator used to supply some internal circuits. This 

regulator is not intended to provide external current so it must not be used to supply external 
loads. An external capacitor must always be connected to this pin (preferably towards 
V

Supply

 pin), recommended value is in the range 80 ÷ 120 nF.

The V

SupplyInt

 pin may also be externally connected to V

Supply

 pin by means of an external 

resistor R

EXT

: this allows R

EXT

, particularly when V

Supply

 is at the max values of the 

operative supply range, to dissipate power that otherwise would be dissipated inside the 
chip. The choice of the optimal resistor depends on the application since it is strictly 
depending on both V

Supply

 and the current used inside the chip (that is changing with the 

chosen configuration).

R

EXT

 could be chosen by applying this formula: R

EXT

 = (V

Supply

 min - V

S_Int 

max)/(I

S_Int

 max). 

I

S_Int 

max is depending from the chosen configuration and represents the total current needed 

by the circuits connected to this pin.

For example, with V

Supply

 = 32 V and I

S_Int

 = 12 mA a typical resistor value is 1 k

Ω.

VsupplyInt

IS_Int_TYP

Vsupply

GND

internal
circuits

L6460 

L6460