LTC2977 datasheet(95/138 Pages) AD

95 / 138 page

LTM4664A

Rev. 0

For more information www.analog.com

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

0x28

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

350kHz

0xFABC

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: ΔVBE measurement.

Now reserved, ΔVBE only supported.

[4:3]

Reserved

Reserved, always low DCR current sense

VOUT Range

The maximum output voltage is 2.75V

The maximum output voltage is 3.6V

Bit[0]

Mode

Discontinuous

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 LTM4664A PSM 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 LTM4664A PSM computes temperature in °C from ∆VBE measured by the ADC at the TSNSn pin as

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

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