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GDBD 4410
Power Supply
One power supply with a single, ground
referenced voltage V DD is required for all
four low side drivers within the driver unit
together. It shall be connected between
the terminals +2467 (plus) and M2467
(ground).
The high side drivers for transistors T1, T3
and T5 can be supplied in one of the
following ways:
? power supplies on separate potentials
- Those typically make use of additional
secondary windings of the transformer
which is used in an existing auxiliary
switched mode power supply anyway.
However only one output voltage can be
controlled in this case.
- Alternatively, DC-DC converters with high
insulation voltage might be used.
? bootstrap circuit
The circuit is exemplary shown for a phase-
leg in figure 2:
- When low side transistor T2 or diode D2 is
conducting, high side ground M1 is on
potential of low side ground M2 plus
saturation voltage U CEsat of T2 or minus
Fig. 2 Bootstrap circuit
forward voltage U F of D2. Plus of low side
driver supply +2 thus can charge the buffer
capacitor for the high side driver supply
Symbol
Definitions/Conditions
Characteristic Values
(T VJ = 25°C, V DD = 15 V unless otherwise specified)
min. typ.
max.
C V1 via high voltage diode D B and current
limiting resistor R B .
Quiescent Power Supply Current
- When low side transistor T2 and diode D2
are off, high side transistor T1 can be driven
I DD
V DD Current/V in = V DD or LG, I D = 0
20
mA
with the charge stored in C V1 . When T1 or
D1 are conducting, bootstrap diode is
blocking about DC link voltage.
It should thus be noted that
- regular turn on of T2 or D2 is mandatory for
operation of this circuit, otherwise there is
no supply for T1 driver
- T1 driver supply voltage level is quite
inaccurate, also depending on T2 U CEsat or
D2 U F respectively
- bootstrap diode D B has to be rated for
operation with DC link voltage
- bootstrap resistor R B should be sized in a
way that charging of C V1 is effectuated
within the minimum on time of T2 or D2
respectively
- bootstrap diode D B and resistor R B have to
sustain the charging current peaks.
Bootstrap circuits for the three high side drivers
can easily be placed on the printed circuit
board, the driver unit is connected to, between
pins +2467 and +1 or +3 or +5 respectively.
Generally, supply voltage levels of V DD = 15
V are recommended.
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5-6
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