L9779WD-SPI datasheet(53/141 Pages) STMICROELECTRONICS

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L9779WD-SPI

Functional description

140

6.8.2

LSb function OUT6, 7 (O2 heater)

Figure 34. LSb function OUT6, 7 (O2 heater)

LSb functionality description

LSb are 2 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 IN6, IN7.

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

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 21. LSb electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

OUT 6, 7

RDS-on LSb

Drain source resistance

T = -40°C, Iload = 3 A

0.05

0.16



T = 25°C, Iload = 3 A

0.13

0.23



T = 130°C, Iload = 3 A

0.21

0.47



IOUTlk

Output leakage current

µA

VS/R

Voltage S/R on/off

R = 4.5

, C = 10 nF

From 80% to 30% of VOUT

0.5

2.5

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_ LSb

Turn-on delay time

From command to 80% VOUT

Load: 4.5

, 10 nF

7.5

µs

TTurn-off_ LSb

Turn-off delay time

From command to 20% VOUT

Load: 4.5

, 10 nF

7.5

µs

Vcl

Output clamping voltage Iload = 1.5 A

PWclampSP

Clamp single pulse ATE

test

Iload = 1.5 A; single pulse

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