TDA7476 datasheet(5/19 Pages) STMICROELECTRONICS

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TDA7476

Aol

Open load det. (voltage across

the sensing resistor. Below this

limit the Aux pin is considered in

Open Load condition)This

condition must be true for a time

higher than Tdel

High side driver ON

0.085

Anop

Normal Operation det. (Voltage

across the sensing resistor.

Within these limits the load

resistance connected to the Aux

pin is considered correct)

0.125

0.5

PERMANENT DIAGNOSTIC - ACQUISITION TIME DELAY

Tdel

Acquisition time delay - The fault

is considered true if the fault

condition are present for more

than Tdel without interruption

PERMANENT DIAGNOSTIC - WARNING PIN

Vsat

Saturation voltage on pin 5

Sink Current at Pin 5 = 1mA

ADDRESS SELECT

VADD

Voltage on pin 4

Address 0100010X

1.5

Address 0100011X

I2C BUS INTERFACE

fSCL

Clock Frequency

400

KHz

VIL

Input Low Voltage

1.5

VIH

Input High Voltage

VSAT

Sat Voltage at pin 2

Sink Current at Pin 2 = 5mA

1.5

ELECTRICAL CHARACTERISTICS (continued)

(Vs = 14.4V; Tamb = 25°, unless otherwise specified.)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

WORKING PRINCIPLES

Turn-on diagnostic - CH1, CH2, CH3, CH4, CH5 -

Shorted load/open load detection

To detect a short across the load or an open

load, a subsonic current pulse is generated. The

information related to the status of the outputs is

measured and memorized at the top of the

current pulse (tm in fig.1). The current is

sourced by the positive pins (CH1+,...CH5+)

and it is sunk by the corresponding negative

pins (CH1-,...CH5-).

Figure 1.

t(ms)

ISOURCE

ISINK

I(mA)

D97AU571

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