User Manual

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Revision 1.4

2019-10-11

EVAL-M3-CM615PN User Manual

iMOTION™ Modular Application Design Kit

Hardware description of EVAL-M3-CM615PN

Based on this calculation, the current input for the MADK combination of EVAL-M3-102T and EVAL-M3-CM615PN

is 27.69 mV/A. Please use same procedure to calculate the current input for other combinations of MADK boards

and enter it into MCEWizard.

5.1.4

PFC Overcurrent protection circuit and PFC Gatekill configuration

PFC protection circuit for EVAL-M3-CM615PN as shown in Figure 16, but the left side of RS1 is negative. If the

bus current Ibus is larger than the setting value, the output PFCGK of U2 will be trigger low and be active.

Figure 16 PFC protection Circuit on the EVAL-M3-CM615PN evaluation board

The PFCGK active setting current is 15.5A for EVAL-M3-CM615PN evaluation board. And the calculation formula

is as follows,

= + − + ∗

+

Please attention that for control board EVAL-M3-102T, it doesn’t use the external PFC gatekill signal PFCGK.

Note: PFC Overcurrent protection circuit just generates the signal of PFCGK, and there is no more action for EVAL-

M3-CM615PN. The power board will not turn off the PFC gate driver IC if the control board doesn’t do

anything when PFCGK is active.

RS1

0.03,1W, 1%

R8

0R

R9

0R

C6

102

+3.3V

R15

10k, 1%

+3.3V

R16

4.7K

R17

1k, 1%

R11

1k, 1%

C7

102

R13

3.92k, 1%

OC set to 465mV/15.5A

PFCGK

3

1

4

U2

LM397

VCC

C39

102

To U1 pin4

GND

Ibus