LTM4677 datasheet(75/110 Pages) AD

75 / 110 page

LTC3888-1

Rev. 0

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FREQUENCY_SWITCH

The FREQUENCY_SWITCH command sets the switching frequency of all LTC3888-1 PWM channels in kilohertz. The

valid range for this command value is 250 to 1000, inclusive. At most only one IC sharing SYNC should be programmed

as clock master. See bit 4 in MFR_CONFIG_ALL. FREQUENCY_SWITCH value will determine the free-running frequency

of PWM operation if an expected external clock source is not present or the bussed SYNC line becomes stuck due an

external fault or conflict. Both master channels must be turned off by the RUN pins, OPERATION command, or their

combination to process this command. If this command is sent while either master channel is operating, the LTC3888-1

will NACK the command byte, ignore the command and its data, and assert a BUSY fault. A PLL Unlocked status may

be reported after changing the value of this command until the new frequency is established.

This command has two data bytes in Linear_5s_11s format.

PWM CONFIGURATION

COMMAND NAME

CMD

CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

FREQUENCY_SWITCH

0x33 PWM frequency control.

R/W Word

L11

kHz

500kHz

0xFBE8

MFR_CHAN_CONFIG

0xD0 General channel-specific configuration.

R/W Byte

Reg

0x1D

MFR_PWM_CONFIG_LTC3888-1

0xF5 LTC3888-1 PWM configuration common to

both master channels.

R/W Byte

Reg

0x03

MFR_PWM_MODE_LTC3888-1

0xD4 Channel-specific LTC3888-1 PWM mode

control.

R/W Byte

Reg

0x02

MFR_PWM_COMP

0xD3 Channel-specific PWM loop compensation

R/W Byte

Reg

0xAE

PMBus COMMAND DETAILS (PWM Configuration)

LTM4677 Datasheet(PDF) 75 Page - Analog Devices

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