LT3752 datasheet(18/52 Pages) AD

Part #	LT3752

Description	Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller

PDF	52 Pages

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Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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18 / 52 page

LT3752/LT3752-1

Rev. C

For more information www.analog.com

Figure 4. LT3752-1 Start-Up and Shutdown Timing Diagram

TIMING DIAGRAMS

TRIGGER

SOFT STOP

SYSTEM INPUT (MIN)

+VHYST

1.25V

SYSTEM INPUT (MIN)

SYSTEM INPUT

UVLO_VSEC PIN

(RESISTOR DIVIDER

FROM SYSTEM INPUT)

LT3752-1 VIN PIN

(RESISTOR FROM

SYSTEM INPUT)

INTVCC

SS1

COMP

SS2

fOSC

(SWITCHING

FREQUENCY)

VHK

(HOUSEKEEPING

SUPPLY OUTPUT)

16V CLAMP

VIN(ON)

VIN(OFF)

10V (REG)

150mV

FULL-SCALE fOSC

3752 F04

FULL-SCALE fOSC/2.13

1.25V

7V UVLO(+)

PGOOD(+)

(96% OF FULL-SCALE VHK)

BOOTSTRAP DIODE FROM VHK

OPTIONAL

BOOTSTRAP

DIODE

FROM VHK

SS1

SOFT

STARTS

fOSC AND

DVSEC

SS2

SOFT

STARTS

COMP

COMPLETED SOFT-STOP

SHUTDOWN:

0.6V < UVLO_VSEC < 1.25V

AND SS1 < 150mV

SS1

SOFT

STOPS

fOSC,DVSEC

AND COMP

COMP

SWITCHING

THRESHOLD

1.25V

AOUT, OUT, SOUT

SWITCHING

HOUT

SWITCHING

LT3752 Datasheet(PDF) 18 Page - Analog Devices

LT3752 Datasheet(HTML) 18 Page - Analog Devices

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