LTM4631 datasheet(94/130 Pages) AD

94 / 130 page

LTM4686B

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

Output Current

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT

UNITS

NVM

DEFAULT

VALUE

IOUT_OC_FAULT_LIMIT

0x46

Output overcurrent fault limit.

R/W Word

L11

0xE240

IOUT_OC_WARN_LIMIT

0x4A

Output overcurrent warning limit.

R/W Word

L11

20.5

0xDA90

IOUT_OC_FAULT_LIMIT

The IOUT_OC_FAULT_LIMIT command sets the value of the peak output current limit, in amperes. When the controller

is in current limit, the overcurrent detector will indicate an overcurrent fault condition. The programmed overcurrent

fault limit value is rounded up to the nearest one of the following set of discrete values:

25mV/IOUT_CAL_GAIN

Low Range (1.5x Nominal Loop Gain)

MFR_PWM_MODE [7] = 0

28.6mV/IOUT_CAL_GAIN

32.1mV/IOUT_CAL_GAIN

35.7mV/IOUT_CAL_GAIN

39.3mV/IOUT_CAL_GAIN

42.9mV/IOUT_CAL_GAIN

46.4mV/IOUT_CAL_GAIN

50mV/IOUT_CAL_GAIN

37.5mV/IOUT_CAL_GAIN

High Range (Nominal Loop Gain)

MFR_PWM_MODE [7] = 1

42.9mV/IOUT_CAL_GAIN

48.2mV/IOUT_CAL_GAIN

53.6mV/IOUT_CAL_GAIN

58.9mV/IOUT_CAL_GAIN

64.3mV/IOUT_CAL_GAIN

69.6mV/IOUT_CAL_GAIN

75mV/IOUT_CAL_GAIN

Note: This is the peak of the current waveform. The READ_IOUT command returns the average current. The peak output

current limits are adjusted with temperature based on the MFR_IOUT_CAL_GAIN_TC using the equation:

IOUT_OC_FAULT_LIMIT = IOUT_CAL_GAIN • (1 + MFR_IOUT_CAL_GAIN_TC • (READ_TEMPERTURE_1-27.0)).

The LTpowerPlay GUI automatically convert the voltages to currents.

The IOUT range is set with bit 7 of the MFR_PWM_MODE command.

The IOUT_OC_FAULT_LIMIT is ignored during TON_RISE and TOFF_FALL.

This command has two data bytes and is formatted in Linear_5s_11s format.

IOUT_OC_WARN_LIMIT

This command sets the value of the output current that causes an output overcurrent warning in amperes. The

READ_IOUT value will be used to determine if this limit has been exceeded.

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