L9779WD datasheet(10/170 Pages) STMICROELECTRONICS

10 / 170 page

Detailed features description

L9779WD

10/170

DocID027452 Rev 5

–

LSb (OUT6, 7)

2 Ch. serial IN via MicroSecond Channel, Rdson = 0.47 Ohm @150°C, Vcl = 45 V ±5,

Imax = 5 A

–LSc (OUT19, 20)

2 Ch serial IN via MicroSecond Channel, Imax = 50 mA

Full diagnosis on MicroSecond Channel (2 bit for each channel) and voltage slew rate

control.

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

reduce the power dissipation.



Protected low side relay driver (OUT13 to 18, MRD)

–LSD

6 Ch. serial IN via MicroSecond Channel, Rdson = 1.5 Ohm @150 °C, Vcl = 48 V,

Imax = 600 mA (2 of them with low battery voltage function);

1 main relay driver Rdson = 2.4 Ohm @150 °C, Vcl = 48 V, Imax = 600 mA

With full diagnosis on MicroSecond Channel (2 bit for each channel) and voltage slew-

rate control.

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

reduce the power dissipation.



Ignition pre-drivers (IGN1 to 4)

–

4 x ignition pre-drivers with full diagnostic.



External MOS pre-drivers (OUT8 to 9)

–

2 x MOS pre-drivers with sense of the external drain voltage to perform the

diagnostic:

Open load in OFF state

Shorted load in ON state with programmable threshold voltage and programmable

filter time via MSC



Configurable power stages CPS: stepper motor driver/ high-side - low-side (OUT21 to 28)

1 x Stepper motor driver designed for a double winding coil motor, used for engine idle

speed control.

The bridge driver is made by 4 independent high-side drivers and 4 independent low-

side drivers:

–

4 high-side driver, Rdson =1.5 Ohm, Imax = 600 mA

–

4 low-side driver, Rdson = 1.5 Ohm, Imax = 600mA

The 4 high-side drivers and the 4 low-side drivers can be controlled independently

The low-side drivers could be connected in parallel (in pairs): OUT22 with OUT24 and

OUT27 with OUT28.

Low-side and high-side drivers implement voltage SR control to minimize emission.

Two high-side drivers have the low battery voltage function.



Thermal shutdown

–

1 x Thermal shutdown (Tj > 175 °C = Tsd) if Tj > Tsd: VTRK1, 2 are turned off.

–

1 x Thermal shutdown (Tj > 175 °C = Tsd) if Tj > Tsd: OUT1 to 10, OUT13 to 20,

OUT21 to 28, IGN1 to 4 are turned off.

–

1 x Thermal shutdown (Tj > 175 °C = Tsd) if Tj > Tsd: MRD is turned off (if battery

present).

L9779WD 数据表(PDF) 10 Page - STMicroelectronics

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