LTC7813 datasheet(8/36 Pages) LINER

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LTC7821

Rev A

For more information www.analog.com

TYPICAL PERFORMANCE CHARACTERISTICS

HYS_PRGM Voltage Window

vs Temperature

Voltage at Timer Pin to Start and

Stop Capacitor Balancing

vs Temperature

TEMP Pin Trip Voltage

vs Temperature

Line Transient 10V/ms

Steady-State Output Voltage

Ripple of Typical Application

Load Transient 2A–12A–2A of

Typical Application

Short-Circuit and Recovery

TEMP Fault Characteristic

TA = 25°C, unless otherwise noted.

VHYS_PRGM = INTVCC

VHYS_PRGM = 1.2V

TEMPERATURE (°C)

–50 –25

100 125

–1.5

–1.2

–0.9

–0.6

–0.3

0.0

0.3

0.6

0.9

1.2

1.5

7821 G20

Stop Balancing

Start Balancing

TEMPERATURE (°C)

–50 –25

100 125

0.3

0.5

0.7

0.9

1.1

1.3

1.5

7821 G21

FALLING

RISING

TEMPERATURE (°C)

–50 –25

100 125

1.00

1.05

1.10

1.15

1.20

1.25

1.30

7821 G22

1ms/DIV

VIN

10V/DIV

MID

10V/DIV

VOUT

100mV/DIV

AC-COUPLED

7821 G23

200ms/DIV

VOUT

10V/DIV

20A/DIV

PGOOD

5V/DIV

7821 G26

20ms/DIV

TEMP

2V/DIV

FAULT

10V/DIV

PGOOD

5V/DIV

SW3

20V/DIV

VOUT

20V/DIV

7821 G27

VIN = 48V

VOUT = 12V

ILOAD = 30mA

10µs/DIV

CONTINUOUS

MODE

100mV/DIV

AC-COUPLED

Burst Mode

OPERATION

100mV/DIV

AC-COUPLED

PULSE-

SKIPPING

MODE

100mV/DIV

AC-COUPLED

7821 G24

50µs/DIV

VOUT

500mV/DIV

AC-COUPLED

10A/DIV

7821 G25

VIN = 48V

VOUT = 12V

fSW = 500kHz

Maximum Current Sense Threshold

vs Common Mode Voltage

VSENSE COMMON MODE VOLTAGE (V)

45.0

47.5

50.0

52.5

55.0

7821 G19

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