LTC3706IGN datasheet(17/20 Pages) LINER

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LTC3706

3706fb

Figure 4. Connections for PolyPhase Operation

NDRV

UVLO

LTC3705

(MASTER)

VCC

SS/FLT

FB/IN+

FS/IN–

VIN

–

VIN

VIN NDRV VCC

PT+

PT–

RUN/SS

LTC3706

(MASTER)

ITH

3706 F05

VOUT

VBIAS

FS/SYNC

•

NDRV

SS/FLT

LTC3705

(SLAVE)

VCC

UVLO

FB/IN+

FS/IN–

VIN NDRV VCC

PT+

PT–

RUN/SS

LTC3706

(SLAVE)

ITH

PHASE

FS/SYNC

•

APPLICATIONS INFORMATION

PolyPhase Applications

Figure 4 shows the basic connections for using the LTC3705

and LTC3706 in PolyPhase applications. One of the phases

is always identiﬁed as the “master,” while all other phases

are “slaves.” For the LTC3705 (primary side), the master

monitors the VIN voltage for undervoltage, performs the

open-loop start-up and supplies the initial VCC voltage for

the master and all slaves. The LTC3705 slaves simply stand

by and wait for PWM signals from their respective pulse

transformers. Since the SS/FLT pins of master and slave

LTC3705’s are interconnected, a FAULT (overcurrent, etc.)

on any one of the phases will perform a shutdown/restart

on all phases together. The LTC3705 is put into slave mode

by omitting the resistor on FS/IN–. For the LTC3706, the

master performs soft-start and voltage-loop regulation by

driving all slaves to the same current as the master using

the ITH pins. Faults and shutdowns are communicated via

the interconnection of the RUN/SS pins. The LTC3706 is

put into slave mode by tying the FB pin to VCC.

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