LTM4676A_15 Datasheet, PDF (89/130 Pages) Linear Technology – Dual 13A or Single 26A Module Regulator with Digital Power System Management

LTM4676A
Appendix C: PMBus Command Details
MFR_RESET
This command provides a means by which the user can perform a reset of the LTM4676A. Identical to RESTORE_USER_ALL.
This write-only command has no data bytes.
PWM Config
COMMAND NAME
MFR_PWM_MODE
MFR_PWM_CONFIG
FREQUENCY_SWITCH
CMD CODE DESCRIPTION
0xD4 Configuration for the PWM engine of each channel.
0xF5 Set numerous parameters for the DC/DC controller
including phasing.
0x33 Switching frequency of the controller.
TYPE
R/W Byte
R/W Byte
DATA
DEFAULT
PAGED FORMAT UNITS NVM VALUE
Y
Reg
Y 0xC1
N
Reg
Y 0x10
R/W Word N
L11 kHz Y 500
0xFBE8
MFR_PWM_MODE
The MFR_PWM_MODE command allows the user to program the PWM controller to use, discontinuous (pulse-skipping
mode), or forced continuous conduction mode.
BIT MEANING
7 Range of I_LIMIT
0 – Low Current Range
1 – High Current Range
6 Enable Servo Mode
5 Reserved
4 Page 0 Only: Use of TSNS_1a-Sensed Temperature Telemetry
0 - Temperature sensed via TSNS_1a is used to temperature-correct the current-sense information digitized by Channel 1's current sense input,
ISNS_1a+/ISNS_1a–.
1 - Temperature sensed via TSNS_0a is used to temperature-correct the current-sense information digitized by Channel 1's current sense input,
ISNS_1a+/ISNS_1a–. Telemetry obtained from the thermal sensor connected to TSNS_1a can be external to the module, if desired.
3 Reserved
2 Reserved
1 Voltage Range
0 - Hi Voltage Range 5.5 volts max
1 - Lo Voltage Range 2.75 volts max
0 PWM Mode
0 - Discontinuous Mode
1 - Continuous Mode
Whenever the channel is ramping on, the PWM mode will be discontinuous, regardless of the value of this
command.
Bit [7] of this command determines if the part is in high range or low range of the IOUT_OC_FAULT_LIMIT command.
Changing this bit value changes the PWM loop gain and compensation. Changing this bit value whenever an output is
active may have detrimental system results.
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