PWM DC Motor Regulator – Data Sheet

AS8410

Rev. 1.0, December 2000

1 Key Features

The AS8410 builds up a complete PWM DC Motor current regulation loop with an external

n-channel power FET. A full diagnosis of motor failures with stand-alone failure handling

procedures is integrated.

One of the most important features of this ASSP namely in automotive applications is the

slew rate regulated switching of the external power FET. This technology enables two

features of the DC motor regulator, which was up to now impossible to realise at the same

time:

• An excellent EMC behaviour (very low RF emission in the whole frequency

range)

• A high power efficiency > 95 % (fall / rise time < 150 ns)

A short overview of the main features of the AS8410 is given here below:

Main properties:

• Complete PWM DC motor regulator with an external power FET

• Single voltage supply in the range VB = 6 V … 35 V (Vpump

• Analogue motor current regulation loop (two modes: set value as digital duty ratio of a

• High power efficiency of the whole regulator module (> 95 %)

• Low RF emission in the whole frequency range

• Fully protected, analogue / digital failure handling procedures (see below: Security

functions)

• Simple programming possibilities for different classes of DC motors and

different operating modes (set value input, over temperature-handling procedure)

• Applicable directly on the automotive board supply battery (burst and surge)

• Automatic sleep mode controlled by the set value

Security functions:

1. Extensive diagnosis of the DC motor and the power FET,

failures handling procedures and report of the failures:

1.1 Over current detection and protection

1.2 No load detection of the motor

1.3 Open wire detection (motor or power switch)

1.4 Short circuit of the power switch detection

1.5 Blocked motor detection and protection

1.6 Short-circuited motor segments detection and protection

1.7 Protection of the power FET and the ASIC, if the motor works in generator

mode

2. Over- / Under Voltage detection and protection

3. Over Temperature detection and protection in two modes