STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Scheda Tecnica
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EVAL6460
Internal supplies
L6460
30/139
Doc ID 17713 Rev 1
4 Internal
supplies
L6460 includes three internal regulators used to provide a regulated voltage to internal
circuits.
circuits.
The internal regulators are the following:
- V
SupplyInt
regulator.
- Charge pump regulator.
- V
3v3
regulator.
4.1 V
SupplyInt
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
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.
Figure 3.
V
SupplyInt
pin
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
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
circuits
L6460
L6460