LTM4677 datasheet(70/116 Pages) AD

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LTC3883/LTC3883-1

Rev. F

For more information www.analog.com

MFR_RESET

This command provides a means by which the user can perform a reset of the LTC3883.

This write-only command has no data bytes.

PWM CONFIGURATION

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

MFR_PWM_MODE_

LTC3883

0xD4

Configuration for the PWM engine.

R/W Byte

Reg

0xD2

MFR_PWM_CONFIG_

LTC3883

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

350

0xFABC

MFR_PWM_MODE_LTC3883

TheMFR_PWM_MODE_LTC3883commandallowstheusertoprogramthePWMcontrollertouseBurstModeoperation,

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

[5:4]

00b

01b

10b

READ_IIN Gain Setting

2x Gain, 50mV Max Input

4x Gain, 20mV Max Input

8x, Gain, 8mV Max Input

Start DCR Auto Calibration

Reserved

Bit[1:0]

00b

01b

10b

Mode

Discontinuous

Burst Mode Operation

Forced Continuous

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.

Bit [6] The LTC3883 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).

Bit[5:4] set the READ_IIN gain and range setting of the input current sense amplifier.

PMBus COMMAND DETAILS

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