L9908 datasheet(69/152 Pages) STMICROELECTRONICS

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Figure 43. Shoot-through protection on Ext. FET Vgs functional operation

Note:

VGS STD Filter integrates Vgs_LSn/Vgs_HSn timing overlap on multiple PWM periods, in this way STD Fault on

Ext. FET Vgs can be detected also in case minimum timing overlaps are spread over multiple and not adjacent

periods.

The STD diagnosis can be disabled on the single half bridge by a dedicated SPI bit as follows:

Table 63. Shoot-Through Protection on PWM inputs enable bit

STPn_PWM_DIS

Description

Shoot-through protection on PWM input enabled (Default)

Shoot-through protection on PWM input disabled

Table 64. Shoot-Through Protection on Ext. FET VGS enable bit

STPn_VGS_DIS

Description

Shoot-through protection on FET Vgs enabled (Default)

Shoot-through protection on FET Vgs disabled

The T_stp_flt configuration for the n-th pre-driver can be set by a dedicated SPI bit as follows:

Table 65. Shoot-Through Protection on PWM inputs filtering configuration bits

STPn_PWM_CFG1

STPn_PWM_CFG0

Description

0.2 μs (Defaults)

0.5 μs

1 μs

1.5 μs

Table 66. Shoot-Through Protection on Ext. FET VGS filtering configuration bits

STPn_VGS_CFG1

STPn_VGS_CFG0

Description

0.2 μs (Defaults)

0.5 μs

L9908

Functional description

DS13546 - Rev 5

page 69/152

L9908 Datenblatt(PDF) 69 Page - STMicroelectronics