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L9362

Figure 10. TMPS1 vs. Temperature (4.5V

 Vcc  5.5V; 0.5A  Iout1...4  3A).

FUNCTIONAL DESCRIPTION

Introduction

The Quad Low Side Driver UF07 is built up of four identical channels (Low Side Drivers), controlled by four

CMOS input stages. Each Channel is protected against short to VBat and by a zener clamp against overvoltage.

A diagnostic logic recognizes four failure types at the output stage: overcurrent, short to GND, open-load and

overtemperature.

The failures are stored individually for each channel in one byte which can be read out via a serial interface (SPI).

Each channel has a current feedback output which sinks a current proportional to the load current of the Low

Side Switch.

Output Stage Control

Each of the four output stages is switched ON and OFF by an individual control line (NON-Input). The logic level of

the control line is CMOS compatible. The output transistors are switched off when the inputs are not connected.

Power Transistors

Each of the four output stages has its own zener clamp. This causes a voltage limitation at the power transistors

when inductive loads are switched off. Output voltage ramp occurring when the output is switched on or off, is

within defined limits. Output transistors can be connected in parallel to increase the current capability. In this

case, the associated inputs, outputs and current feedback outputs should be connected together.

Diagnostics

Following failures at the output stage are recognized:

Short circuit to VBat or overtemp................= SCB (Highest priority)

Short circuit to GND...................................=SCG

Open Load.................................................= OL (Lowest Priority)

-3

-2

-50

0

Temp./[˚C]

50

100

150

200

-1

0

1

2

3