Overtemperature Hardware Protection Circuit; Ntc Shutdown Value Calculation And Configuration - Infineon iMOTION EVAL-M3-IM564 User Manual

EVAL-M3-IM564 User Manual
iMOTION™ Modular Application Design Kit
Hardware description of EVAL-M3-IM564
The VFO pin of CIPOS™-Modules provides direct access to the NTC, which is referenced to VSS. An external pull-
up resistor connected to +3.3V ensures that the resulting voltage can be directly connected to the
microcontroller.
Figure 26 depicts the CIPOS™ internal circuit at pin VFO. An external pull-up resistor is required to bias the NTC.
14
16
Figure 26 Internal circuit at pin VFO for CIPOS™ IPM IM564-X6D/IM564-X6DS
5.3.2

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 this 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 iMOTION™ 100series control board, the maximum input low voltage of Gatekill for IRMCF1xx is 0.8V. And
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 0.8V at 120°C. And then the Gatekill will ask the
microcontroller to stop generating PWM pulses if the temperature of NTC continues to rise.
+3.3V
MCU_GK
R_pullup_control_board
4.87k,1%
MCU_NTC
Control Board EVAL-M3-102T
Figure 27 Overtemperature protection circuit schematic for EVAL-M3-IM564 and EVAL-M3-102T
5.3.3

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 resistor on 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 4.87kΩ. 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 R
is 5.388kΩ for IPM IM564-X6D/IM564-X6DS which is used in EVAL-M3-IM564.
User Manual
VDD
VFO
R
ON,FLT
VSS
Thermistor
VFO
R45
10k, 1%
VTH
R46
C42
DNI
105
from ITRIP Latch
>1
from UV detection
TM
CIPOS
+3.3V
R44
9.1k,1%
14
VFO
C41
NTC
472
16
VSS
M1
27 of 45
ITRIP detection
>1
UV detection
IM564-X6D/IM564-X6DS
at 100°C
NTC
Revision 1.0
2019-09-17