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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
[4:3]
Reserved
2
Reserved, always low DCR current sense
1
V
Range
OUT
1b
The maximum output voltage is 2.75V
0b
The maximum output voltage is 5.5V
Bit[0]
Mode
0b
Discontinuous
1b
Forced Continuous
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. 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 LTM4700 will not servo while the part is OFF , ramping on or ramping off. When set to a 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 LTM4700 computes temperature in °C from ∆V
T = (G • ∆V
• q/(K • ln(16))) – 273.15 + O
BE
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
www.analog.com
LTM4700
DATA
DEFAULT
FORMAT UNITS NVM
VALUE
Reg
Y
0x28
Reg
Y
0xC7
Reg
Y
0x10
L11
kHz
Y
350
0xFABC
Rev. B
81
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