AN4355 datasheet(13/25 Pages) STMICROELECTRONICS

Part #	AN4355

Description	The L6480 and L6482 devices are motor controllers providing

PDF	25 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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13 / 25 page

DocID025240 Rev 2

13/25

AN4355

Supply management

Figure 8. Gate drivers supply circuit

The supply circuit for the device logic is shown in Figure 9. When the VREG voltage is

generated through the integrated linear regulator the VCCREG pin must be connected to

a supply voltage ranging from VREG + 3 V = 6.3 V (3 V is the dropout voltage of the linear

regulator) and VCC. VCCREG must be always lower than VCC otherwise the ESD protection

diode is turned on and the device can be damaged.

The device can be protected from this event adding an external low drop diode between the

VCCREG and VCC pins.

In order to supply directly the logic the external supply voltage must be connected to both

the VREG and VCCREG pins; this way the internal linear regulator is disabled.

Figure 9. Logic supply circuit

AN4355 Datasheet(PDF) 13 Page - STMicroelectronics