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EVAL-IMM101T
Smart IPM evaluation board application note
Schematics and Layout
5.1
DC-Link Voltage Measurement
Figure 8 provides the DC bus sense resistor details.
Figure 8
DC bus sense resistor on EVAL-IMM101T evaluation board
The DCBSENSE voltage is read by pin P2.10 of the controller. With 13.3 kΩ as pull down resistor, the DCBSENSE
voltage results in the range of 0 to 3.3 V on the pin reflecting a DC bus voltage range of 0 to 500 V.
5.2
EMI filter
Figure 9 depicts the schematic from the AC line input connector J1 to the rectified DC bus voltage.This circuitry
includes a passive EMI filter consisting of elements CX1, CX2, L1, CY1 and CY2, a 2A/600 V rectifier (BR1), a NTC
resistor RT1, two ceramic capacitances C12 and C13, a film capacitance C32 and an electrolytic capacitance C31
for buffering the rectified DC bus voltage DCP.
Figure 9
Schematic for EMI filter and AC/DC section of the EVAL-IMM101T evaluation board
5.3
Inverter section using Smart IPM
The inverter section is implemented as sketched in Figure 10. The three phase inverter consist of six MOSFETs
with the following blocking voltage and R
DS(on)
(typical value at 25°C) according to the part number:
IMM10xT-015M – output rating: 500 V/4.8 Ω R
DS(on)
IMM10xT -046M – output rating: 600 V/1.26 Ω R
DS(on)
