LT3752 datasheet(14/52 Pages) AD

14 / 52 page

LT3752/LT3752-1

Rev. C

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PGND (Pins 19, 38, 39): The Power Grounds for the IC.

The package has an exposed pad (Pin 39) underneath the

IC which is the best path for heat out of the package. Pin 39

should be soldered to a continuous copper ground plane

under the device to reduce die temperature and increase

the power capability of the LT3752/LT3752-1.

ISENSEN (Pin 20): Negative input for the current sense

comparator. Kelvin connect to the sense resistor in the

source of the power MOSFET.

ISENSEP (Pin 21): Positive input for the current sense

comparator. Kelvin connect to the sense resistor in the

source of the power MOSFET. A resistor in series with

ISENSEP programs slope compensation.

OC (Pin 22): An accurate 96mV threshold, independent

of duty cycle, for detection of primary side MOSFET over-

current and trigger of hiccup mode. Connect directly to

sense resistor in the source of the primary side MOSFET.

Missing Pins 23, 25, 27, 29, 31, 33, 35: Pins removed

for high voltage spacings and improved reliability.

OUT (Pin 24): Drives the gate of an N-channel MOSFET

between0VandINTVCC.Activepull-offexistsinshutdown.

INTVCC (Pin 26): A linear regulator supply generated from

VIN. LT3752 supplies 7V for AOUT, SOUT, OUT and HOUT

gate drivers. LT3752-1 supplies 10V for AOUT,SOUT, and

OUT gate drivers (HOUT supplied from VIN). INTVCC must

be bypassed with a 4.7µF capacitor to power ground. Can

beexternallydrivenbythehousekeepingsupplytoremove

power from within the IC.

VIN (Pin 28): Input Supply Pin. Bypass with 1µF to ground.

SOUT (Pin 30): Sync signal for secondary side synchro-

nous rectifier controller.

AOUT (Pin 32): Control signal for external active clamp

switch. (P-channel LT3752, N-channel LT3752-1).

HOUT (Pin 34): Drives the gate of an N-channel MOSFET

used for the housekeeping supply. Active pull-off exists

in shutdown.

HISENSE (Pin 36): Current sense input for the house keep-

ing supply. Connect to sense resistor in the source of the

power MOSFET. A resistor in series with HISENSEprograms

slope compensation.

PIN FUNCTIONS

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