LTM4680 datasheet(7/28 Pages) AD

7 / 28 page

LTM4660

Rev. 0

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

Start-Up Characteristics

Steady State Waveforms

VIN = 48V, VOUT = 12V, FCM

VOUT Ripple

Line Transient

VIN Slew Rate 10V/ms

Load Transient

12.5A to 25A to 12.5A

100ms/DIV

4660 G07

VIN

50V/DIV

TIMER

1V/DIV

VMID

20V/DIV

VOUT

10V/DIV

1s/DIV

4660 G08

C+

12V/DIV

C–

12V/DIV

48V

24V

5s/DIV

4660 G09

FCM

Burst

Mode

OPERATION

PULSE-

SKIPPING

MODE

VIN = 48V

VOUT = 12V

COUT = 150F ×2 + 10F ×3

COMPa TIED TO COMPb

10ms/DIV

4660 G10

VIN

10V/DIV

VMID

10V/DIV

VOUT

100mV/DIV

AC-COUPLED

VOUT = 12V

POUT = 300W

CMID AND CFLY = 10F ×12

1ms/DIV

4660 G11

VOUT

500mV/DIV

AC-COUPLED

ILOAD

10A/DIV

VIN = 48V

VOUT = 12V

COUT = 150F ×2 + 10F ×3

COMPa TIED TO COMPb

Radiated EMI Performance (CISPR22 Radiated

Emission Test with Class B 3m Limits)

VIN = 54V

VOUT = 12V

POUT = 300W, fSW = 350kHz

DC2879A, MEASURED IN A 3m CHAMBER, PEAK DETECT METHOD

CISPR CLASS B 3M

VERTICAL

HORIZONTAL

FREQUENCY (MHz)

130

230

330

430

530

630

730

830

930

–10

4660 G12

1000

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