POWERSTEP01 datasheet(31/92 Pages) STMICROELECTRONICS

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powerSTEP01

Functional description

Figure 13. Overcurrent detection - principle scheme

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

measurements, in following cases:



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



The respective half-bridge is commutating;



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

elapsed yet;



The respective gate is turned off.

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

OC_SD bit in 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.

7.10

Undervoltage lockout (UVLO)

The powerSTEP01 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 MOSFETs are immediately turned off and the UVLO flag in the

STATUS register is forced low.

The UVLO flag is forced low and the MOSFETs 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.

OUTxx

BLANKING

OCD_HSxx

OCD_LSxx

CURRENT

DAC

THRESHOLD

GND

LOGIC CORE

Voltage

Comparator

Voltage

Comparator

AM16762v1

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