LTM4650 datasheet(10/28 Pages) AD

10 / 28 page

LTM4660

Rev. 0

For more information www.analog.com

command. Connecting this pin to INTVCC will cause the

internal reference to be used for output voltage regulation.

COMPb (L10): Default Loop Compensation Network.

Connect COMPa to COMPb for default loop compensa-

tion—or otherwise, leave open circuit.

COMPa (M10): Current Control Threshold and Error

Amplifier Compensation Point. The current comparator

threshold increases with its COMPa control voltage. Connect

COMPa to COMPb for default loop compensation—or

alternatively, connect a series R-C network from COMPa

to SGND, to apply application-specific loop compensation.

FREQ (M11): Frequency Set Pin. There is a 10μA current

flowing out of this pin. A resistor to ground sets a volt-

age which in turn programs the switching frequency of

the module.

PIN FUNCTIONS

BLOCK DIAGRAM

RUN

>1.3VTYP = ON

100mVTYP HYSTERESIS

CFLY

10µF

×12

C+

C–

MID

2.2

MIDSNS

EXTVCC

VOUT

GND

4660 BD

CMID

10µF

×12

COUTH

22µF

×4

12V

UP TO 25A

CENTRALLY LOCATED

PNP TEMPERATURE

SENSOR

COUTL

150µF

CTRACK/SS

0.1µF

10k

VINSNS

VIN

CINH

4.7µF

×3

VIN

30V TO 60V

CINL

47µF

RVFB

4.32k

VFB

SGND

60.4k

1µF

TEMP+

TEMP–

POWER

CONTROL

4.7nF

0.1µF

10µF

22pF

10nF

4.7nF

1.5µH

2.2

1µF

TEST

EXT_REF

INTVCC

TEMP

PGOOD

FAULT

CLKOUT

MODE/PLLIN

HYS_PRGM

TIMER

TRACK/SS

FREQ

COMPa

COMPb

SGND

RFREQ

61.9k

RHYS_PRGM

100k

RFAULT

10k

RPGOOD

10k

CTIMER

1µF

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