Pwm Configuration - Analog Devices LTM4683 Manual

LTM4683
PMBus COMMAND DETAILS

PWM CONFIGURATION

COMMAND NAME CMD CODE DESCRIPTION
MFR_PWM_COMP 0xD3
MFR_PWM_MODE 0xD4
MFR_PWM_CONFIG 0xF5
FREQUENCY_SWITCH 0x33
MFR_PWM_MODE
The MFR_PWM_MODE command sets important PWM controls for each channel.
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 Use high range of I
LIMIT
0b Low current range
1b High current range
6 Enable servo mode
5 External temperature sense:
0: ∆V measurement.
BE
Now reserved, ∆V only supported.
BE
4 Page 0 Only: Use of TSNSn-Sensed Temperature Telemetry
0 – Temperature sensed through TSNS1,3 is used to temperature-correct the current-sense information digitized by Channel 1,3's power stage.
1 – Temperature sensed through TSNS0,2 is used to temperature-correct the current-sense information digitized by Channel 0,2's power stage.
3 Reserved
2 Reserved
1 V range
OUT
1b The maximum output voltage is 2.75V.
0b The maximum output voltage is 3.6V, NOT NEEDED.
Bit[0] Mode
0b Discontinuous-conduction mode
1b Forced continuous mode
Bit [7] of this command determines if the part is in the high range or low range of the IOUT_OC_FAULT_LIMIT com-
mand. Changing this bit value changes the PWM loop gain and compensation. This bit value should not be changed
when the channel output is active. Writing this bit when the channel is active will generate a CML fault.
Bit [6] The LTM4683 will not servo while the part is Off, ramping on or ramping off. When set to one, the output servo
is enabled. The output set point DAC will be slowly adjusted to minimize the difference between the READ_VOUT_ADC
and the VOUT_COMMAND (or the appropriate margined value).
The LTM4683 computes temperature in °C from ∆V
T = (G • ∆V • q/(K • ln(16))) – 273.15 + O
BE
For both equations,
88
PWM loop compensation configuration
Configuration for the PWM engine.
Set numerous parameters for the DC/DC controller,
including phasing.
Switching frequency of the controller.
measured by the ADC at the TSNSn pin as:
BE
For more information
TYPE PAGED
R/W Byte Y
R/W Byte Y
R/W Byte N
R/W N
Word
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DATA DEFAULT
FORMAT UNITS NVM VALUE
Reg Y 0x48
Reg Y 0xC7
Reg Y 0x10
L11 kHz Y 425
0xFB52
Rev. 0