EASY-DRIVER – User’s Manual
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This situation can be caused by a generic AC/DC Power Converter failure that do
not provide voltage to the the DC/DC board.
The intervention of this protection disables the output stage driving signals; as in
the other cases, a FAULT condition is generated and a “DC-Undervoltage” flag is set
in the EASY-DRIVER power supply status register. The AC/DC generic failure may
be recovered by switching Off and On the Mains power switch.
MOSFETs Over-Temperature
The MOSFETs composing the power supply output stage are all connected to an
heatsink that is monitored by a high-gain temperature sensor.
The internal logic disables the H-Bridge when the temperature rises the defined
threshold value, stored in EEPROM cell #20, and sets a “MOSFET over-temperature”
flag in the status register, thus generating a FAULT condition that, as in the other cases,
needs to be reset before enabling the output again.
Shunt Resistor Over-Temperature
The temperature of the precision shunt resistor used for current sensing is directly
monitored on its case by another high-gain sensor connected to another channel of a
12-bit ADC.
The DSP disables the output stage – i.e. H-bridge – when this temperature rises
above a user-defined threshold value, stored in EEPROM cell #21, and sets a “Shunt
over-temperature” flag in the status register, thus generating a FAULT condition that
needs to be reset before enabling the output again.
