LTM4673 datasheet(88/132 Pages) AD

88 / 132 page

LTM4683

Rev. 0

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PMBus COMMAND DETAILS

PWM CONFIGURATION

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

MFR_PWM_COMP

0xD3

PWM loop compensation configuration

R/W Byte

Reg

0x48

MFR_PWM_MODE

0xD4

Configuration for the PWM engine.

R/W Byte

Reg

0xC7

MFR_PWM_CONFIG

0xF5

Set numerous parameters for the DC/DC controller,

including phasing.

R/W Byte

Reg

0x10

FREQUENCY_SWITCH

0x33

Switching frequency of the controller.

R/W

Word

L11

kHz

425

0xFB52

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

Use high range of ILIMIT

Low current range

High current range

Enable servo mode

External temperature sense:

0: ∆VBE measurement.

Now reserved, ∆VBE only supported.

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.

Reserved

VOUT range

The maximum output voltage is 2.75V.

The maximum output voltage is 3.6V, NOT NEEDED.

Bit[0]

Mode

Discontinuous-conduction mode

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 ∆VBE measured by the ADC at the TSNSn pin as:

T = (G • ∆VBE • q/(K • ln(16))) – 273.15 + O

For both equations,

LTM4673 Datasheet(PDF) 88 Page - Analog Devices

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