L6480 datasheet(28/73 Pages) STMICROELECTRONICS

Part #	L6480

Description	The L6480, realized in analog mixed signal technology, is an advanced fully integrated solution suitable for driving two-phase bipolar stepper motors with microstepping.

PDF	73 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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28 / 73 page

Functional description

L6480

28/73

Doc ID 023278 Rev 3

Figure 12.

Overcurrent detection-principle scheme

The overcurrent detection comparators are disabled, in order to avoid wrong voltage

measurements, in the following cases:

●

The respective half-bridge is in high impedance state (both gates forced off)

●

The respective half-bridge is commutating

●

The respective half-bridge is commutated and the programmed blanking time has not

yet elapsed

●

The respective gate is turned off.

It is possible to set if an overcurrent event causes the bridge turn-off or not through the

OC_SD bit in the CONFIG register.

When the power bridges are turned off by an overcurrent event, they cannot be turned on

until the OCD flag is released by a GetStatus command.

6.10

Undervoltage lockout (UVLO)

The L6480 provides a programmable gate driver supply voltage UVLO protection. When

one of the supply voltages of the gate driver (VCC for the low sides and VBOOT - VS for the

high sides) falls below the respective turn-off threshold, an undervoltage event occurs. In

this case, all gates are immediately turned off and the UVLO flag in the STATUS register is

forced low.

The UVLO flag is forced low and the gates are kept off until the gate driver supply voltages

return to above the respective turn-on threshold; in this case the undervoltage event expires

and the UVLO flag can be released through a GetStatus command.

The UVLO thresholds can be selected between two sets according to the UVLOVAL bit

value in the CONFIG register.

L6480 Datasheet(PDF) 28 Page - STMicroelectronics