LTC7813 datasheet(6/36 Pages) LINER

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LTC7821

Rev A

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

Efficiency and Power Loss

In Different Modes vs Load Current

LTC7821 Start-Up Characteristic

(Pre-Balancing Period)

LTC7821 Start-Up Characteristic

TA = 25°C, unless otherwise noted.

Shutdown Current vs Temperature

Quiescent Current vs Temperature

Shutdown (RUN) Threshold

vs Temperature

Input Voltage UVLO Threshold

vs Temperature

HYS_PRGM, TRACK/SS and FREQ

Pin Current vs Temperature

CCM

DCM

BURST

VIN = 48V

VOUT = 12V

fOSC = 500kHz

LOAD CURRENT (A)

PAGE 1

SCHEMATIC

0.1

100

7821 G01

100ms/DIV

VIN

50V/DIV

TIMER

1V/DIV

SW1 TO SW3

20V/DIV

MID

20V/DIV

7821 G02

100ms/DIV

VIN

50V/DIV

PGOOD

5V/DIV

FAULT

5V/DIV

VOUT

10V/DIV

7821 G03

TEMPERATURE (°C)

–50 –25

100 125

150

200

250

300

350

400

7821 G05

IVIN

IVIN_SENSE

TEMPERATURE (°C)

–50 –25

100 125

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

7821 G06

RISING

FALLING

TEMPERATURE (°C)

–50 –25

100 125

1.10

1.15

1.20

1.25

1.30

1.35

1.40

7821 G07

RISING

FALLING

TEMPERATURE (°C)

–50 –25

100 125

8.0

8.2

8.4

8.6

8.8

9.0

7821 G08

HYS_PRGM Pin

TRACK/SS Pin

FREQ Pin

TEMPERATURE (°C)

–50 –25

100 125

9.6

9.7

9.8

9.9

10.0

10.1

10.2

10.3

7821 G09

fSW = 500KHz

VOUT = 12V

CCM

IOUT = 20A

IOUT = 10A

INPUT VOLTAGE (V)

100

7821 G02

PAGE 1

SCHEMATIC

Efficiency at Various VIN

for VOUT = 12V

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