Specifications

EVALPFC-3kW-IPZ65R019C7
17
Application Note AN 2014-06
V1.1 January 2015
X5
np (MOS2)
Thermal measurement connector
X6
Rg_4pin
SPC20485
X7
Rg_3pin
SPC20485
X8, X9
KL_STANDARD_2
SPC20485
X12
np
for adapter power supply
8 Boost Choke Layout
The boost choke on this evaluation board is self winded since this is not a volume production. It consists of 2
stacked “Kool Mμ” toroids cores with the partnumber 77083A7. As a result of the 64windings with 1.15mm
copper wire the inductance at 100kHz is about 600µH. As the inductance and the magnetic flux optimum is
depending on the switching frequency and the output power, it might be needed to be changed if the
evaluation board is used for changed setting in power and frequency.
Figure 7: Main inductor
9 Source connection options
The source connection for the MOSFET-Gate drive can be set to different options. It is important to make
sure that only one of the Jumper 6, 7 and 8 is closed at the same time. In Figure 8 the possibilities on top
side of the PCB are shown. For Standard trough hole packages one can put as much solder on the 2 surface
area of J6 that there is a electrical connection if a low inductive gate driving is wanted. For Standard gate
drive inductance it is possible to close J8 (see Figure 9) on bottom side of the PCB instead J6 .
To investigate the performance advantages of the 4pin solution please activate J7 on top side of the PCB.
This will totally separate the gate drive circuit from the power path and therefore result in cleanest gate drive
wave forms.