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User Manual

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Revision 1.4

2020-07-16

EVAL-M3-IM564 User Manual

iMOTION™ Modular Application Design Kit

Hardware description of EVAL-M3-IM564

4.3.2

Overtemperature hardware protection circuit

The VFO pin not only provides direct access to the NTC, but also indicates a module failure in case of under-

voltage at pin VDD or in case of triggered overcurrent detection at ITRIP. In these evaluation design kits EVAL-

M3-IM564 and EVAL-M3-102T, the VFO pin is directly connected to the gatekill pin for controller IC IMC102T.

But for the iMOTION™ 100 series control board, the maximum input low voltage of gatekill for IRMCF1xx is 0.8 V.

The NTC thermal resistor is about 3.0 kΩ at 120 °C. The resistors R44 and R45 for the power board EVAL-M3-

IM564 are chosen properly to make sure the voltage of VFO is 0.8 V at 120 °C. The gatekill will then “ask” the

microcontroller to stop generating PWM pulses if the temperature of NTC continues to rise.

Figure 27 Overtemperature protection circuit schematic for EVAL-M3-IM564 and EVAL-M3-102T

4.3.3

NTC shutdown value calculation and configuration

External NTC temperature shutdown value can be calculated as shown below and configured in MCEWizard as

shown in Figure 28. For pull-up resistors on the evaluation control board, please refer to the control board’s

User Manual. For example, for EVAL-M3-102T, the pull-up resistor on the control board is 4.87 kΩ. The value of

resistors R44 and R45 on EVAL-M3-IM564 are 9.1 kΩ and 10 kΩ (see Figure 27). The typical value of RNTC at 100 °C

is 5.388 kΩ for IPM IM564-X6D/IM564-X6DS, which is used in EVAL-M3-IM564.

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Equivalent circuit

VTH

VFO

Fan

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