L6482 datasheet(28/73 Pages) STMICROELECTRONICS

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Functional description

L6482

28/73

Doc ID 023768 Rev 2

Figure 13.

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 L6482 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.

HVGxx

OUTxx

LVGxx

GNDx

BLANKING

OCD_HSxx

OCD_LSxx

CURRENT

DAC

THRESHOLD

GND

LOGIC CORE

Voltage

Comparator

Voltage

Comparator

AM15043v1

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