L9908 datasheet(96/152 Pages) STMICROELECTRONICS

No de pièce	L9908

Description	Automotive 3-Phase motor gate driver unit

PDF	152 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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96 / 152 page

OND_BLANK2

OND_BLANK1

OND_BLANK0

Description

T_ond_blank = 3.5 μs

T_ond_blank = 5 μs

T_ond_blank = 8 μs

Note:

The PWM ON time must be longer than T_ond_blank, else way the short circuit condition cannot be detected.

In order to remove glitches and increase the detection capability of the system also at low Duty Cycles a

cascaded filtering is introduced. Filtering action is developed by a digital up/down counter, incrementing the count

at fault present and decrementing it at fault absent cumulating detections all over PWM cycles.

The T_ond_flt can be configured by dedicated SPI bits as follows:

Table 90. OND filtering time configuration bits

OND_FLT1

OND_FLT0

Description

T_ond_flt= 1 μs

T_ond_flt = 2.5 μs

T_ond_flt = 4 μs (Default)

T_ond_flt = 8 μs

Figure 71. OND blanking and filtering (VDS_LSn example), multiple fault

L9908

Functional description

DS13546 - Rev 5

page 96/152

L9908 Fiches technique(PDF) 96 Page - STMicroelectronics