NCV7748 datasheet(11/30 Pages) ONSEMI

Part #	NCV7748

Description	Automotive LIN Low-Side Relay Driver

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NCV7748

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11

During normal operation, the open circuit impedance

(Roc) is zero ohms (Figure 6). This sets the voltage on

OUT4 or OUT8 to VS volts. As long as VS is above

V_th_open no open circuit fault will be recognized. The

voltage appearing on OUT4 or OUT8 is a result of VS and

the voltage drop across Roc realized by the current flow

created by I_th_open.

The NCV7748 voltage level trip points are referenced to

ground. The threshold range is between 1.0 V and 2.5 V.

With a nominal battery voltage (VS) of 14 V, the resultant

worst case thresholds of detection are as follows.

VS

* OpenLoadDetectionThresholdvoltage

OpenLoadDiagnosticSinkCurrent

+

OpenLoad

Impedance

14 V

* 2.5 V

140

mA

+ 82.1 KW

14 V

* 1.0 V

50

mA

+ 260 KW

The maximum impedance detection threshold is 260 K

W,

but may not be detected until the minimum impedance of

82.1 K

W.

Note – Electrical parameter magnitudes in the Open Load

Detection diagram are shown as typical values.

Open Load

detection

Channel x

GND

OUT4,8

Open

Load

Flag

1.75 V

VS

Roc

100

mA

Output Turn−

on Control

V_th_open

I_th_open

V_th _open = Open Load Detection Threshold Voltage

(OUT4, OUT8)

I_th _open = Open Load Diagnostic Sink Current

Open Load Detection is

active when the output

driver is off.

Figure 6. Open Load Detection

(OUT4, OUT8)

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