L9779WD-SPI datasheet(50/141 Pages) STMICROELECTRONICS

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Functional description

L9779WD-SPI

50/141

DocID027721 Rev 2

6.8

Low-side switch function (LSa, LSb, LSd)

6.8.1

LSa function OUT 1 to 5 (Injectors)

Figure 33. LSa function OUT 1 to 5 (Injectors)

LSa functionality description

LSa are 5 protected low-side drivers with diagnosis and over current protection circuit.

They are driven by logical-AND of SPI control bit and dedicated parallel input IN1...IN5.

The maximum current for OUT1 to 4 is 2.2 A while for OUT5 is 3 A.

When Reset_L9779 signal or OUT_DIS bit is asserted OUT_LSa is switched off.

When an over current fault occurs, the driver switches off with faster slew rate in order to

reduce the power dissipation.

The turn on/off time is fixed and the slew-rate is controlled.

Max Cload = 20 nF.

Table 18. LSa electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

OUT

1 to 5

RDS-on LSa

Drain source resistance

Iload = 1.25 A

0.72



IOUTlk

Output leakage current

Vpin = 13.5 V

µA

VS/R

Voltage S/R on/off

Load: 8

, 10 nF

From 80% to 30% of VOUT

V/µs

VS/R GateKill

FAST VR/S off when an

OVC fault happens

Load: 8

, 10 nF

From 80% to 30% of VOUT

V/µs

TTurn-on_ LSa Turn-on delay time

From command to 80%

VOUT, Load: 8

, 10 nF

µs

TTurn-off_ LSa Turn-off delay time

From command to 30%

VOUT, Load: 8

, 10 nF

µs

Vcl

Output clamping voltage

Iload = 1.25 A

PWclampSP

Clamp single pulse ATE test Iload = 1.25 A single pulse

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