2SC0435T
Description and Application Manual
Page 12
INTELLIGENT POWER ELECTRONICS
How Do 2SC0435T SCALE-2 Drivers Work in Detail?
Power supply and electrical isolation
The driver is equipped with a DC/DC converter to provide an electrically insulated power supply to the gate
driver circuitry. All transformers (DC/DC and signal transformers) feature safe isolation to EN 50178,
protection class II between primary side and either secondary side.
Note that the driver requires a stabilized supply voltage.
Power-supply monitoring
The driver’s primary side as well as both secondary-side driver channels are equipped with a local
undervoltage monitoring circuit.
In the event of a primary-side supply undervoltage, the power semiconductors are driven with a negative gate
voltage to keep them in the off-state (the driver is blocked) and the fault is transmitted to both outputs SO1
and SO2 until the fault disappears.
In case of a secondary-side supply undervoltage, the corresponding power semiconductor is driven with a
negative gate voltage to keep it in the off-state (the channel is blocked) and a fault condition is transmitted to
the corresponding SOx output. The SOx output is automatically reset (returning to a high impedance state)
after the blocking time.
IGBT and MOSFET operation mode
The driver features two operation modes:
•
The first mode is the default IGBT setup with both a positive (regulated) turn-on voltage of 15V
(typical) and a second (non-regulated) turn-off voltage (see Fig. 6).
•
The second mode has been specifically designed for ultra-fast MOSFET switching. It incorporates a
single turn-on voltage only. The turn-off voltage is set to 0V. This MOSFET mode is activated by
connecting the secondary-side terminals COMx and VEx. If 2SC0435T drivers are to be used in the
MOSFET mode, please consult CONCEPT’s technical support service.
