Page – 28/155 AF6ZP0CA – COMBIAC0 & ACE0 2uC – User Manual
U Please ensure that inductive loads are connected so that the paths through
the freewheeling diodes are always present; otherwise use external
freewheeling diodes.
U Use of brushless fan or other loads with built-in capacitors may lead to
high inrush currents at turn-on, which may eventually bring to open-drain
overcurrent trips. Inrush current must be below the peak current.
4.4.7 EB output
Electromechanical brake is operated through an open-drain PWM voltage-
controlled output on pin NEB A4. In order to utilize the built-in freewheeling diode,
the coil must be supplied with pin PEB A2 (see chapter 3.2).
For the 24V versions only, A2 is supplied by a smart high-side driver (see
paragraph 4.4.9). For the other versions, A2 may be supplied either by pin DI0 A1
or by pin PEV A3 depending on the hardware configuration.
In case the vehicle design does not allow the usage of the built-in free-wheeling
diode, i.e. if the return path integrity cannot be guaranteed in all situations,
external free-wheeling diodes must be applied over the inductive loads supplied
by the open drain outputs.
Output features
Up to 22 A continuous current (holding current).
Up to 3 A peak (pulling current) for a maximum of 200 ms.
Individual hardware for detection of: shorted driver, open driver, open coil.
1 kHz PWM frequencies.
Configurable output voltage, by means of separate parameters for pulling
and holding stages.
4 PWM shall only be used for inductive loads such as relays, contactors, motor
brakes or hydraulic valves.
Protection
Protected against inductive discharge with internal freewheeling diodes to pin A2
and ESD protected by suppressor device.
Not protected against reverse polarity of the battery. A way to avoid a failure
caused by the polarity inversion is to activate the contactor only when the voltage
over the DC-bus capacitors has reached the accepted pre charge level.
Built-in diagnostics:
- Overcurrent
- Driver shorted
- Driver open
- Coil open
Refer to chapter 10 for more details about alarms.
4 Overcurrent protection is featured by hardware and it is shared with MC output.
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