LTC3883 Datasheet, PDF (77/112 Pages) Linear Technology – Single Phase Step-Down DC/DC Controller with Digital Power System Management

LTC3883/LTC3883-1
PMBus Command Details
37.5mV/IOUT_CAL_GAIN
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
High Range (Nominal Loop Gain)
MFR_PWM_MODE_LTC3883 [7]=1
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 I_OUT range is set with bit 7 of the MFR_PWM_MODE_LTC3883 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.
In response to the IOUT_OC_WARN_LIMIT being exceeded, the device:
• Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE
• Sets the IOUT bit in the STATUS_WORD
• Sets the IOUT Overcurrent Warning bit in the STATUS_IOUT command, and
• Notifies the host by asserting ALERT pin
This condition is detected by the ADC so the response time may be up to 120ms.
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
Input Current Calibration
COMMAND NAME
CMD
CODE DESCRIPTION
MFR_IIN_CAL_GAIN
0xE8 The resistance value of the input current sense
element in mΩ.
TYPE
R/W Word
DATA
FORMAT
L11
UNITS
mΩ
DEFAULT
NVM
VALUE
Y
5.000
0xCA80
MFR_IIN_CAL_GAIN
The IOUT_CAL_GAIN command is used to set the resistance value of the input current sense resistor in milliohms.
(see also READ_IIN).
This command has two data bytes and is formatted in Linear_5s_11s format.
3883f
77