LT7101 datasheet(8/38 Pages) AD

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LT7101

Rev. 0

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Output Current Programming

Current Loop Step Response

ICTRL Voltage to Inductor Current

Gain vs Frequency

TYPICAL PERFORMANCE CHARACTERISTICS T

A = 25°C, unless otherwise noted.

VICTRL = 0.76V TO 1.12V PULSE

VIN = 48V, VOUT = 4V

FIGURE 14 CIRCUIT

40µs/DIV

VICTRL

500mV/DIV

250mA/DIV

7101 G32

VIN = 24V

VOUT = 4V

RICTRL = 40.2k

IOUT(AVG) = 500mA

fSW = 300kHz

FIGURE 14 CIRCUIT

BW = 93kHz

FREQUENCY (kHz)

0.1

100 300

0.2

0.4

0.6

0.8

1.0

1.2

1.4

7101 G33

Synchronization to External Clock

SW Node Waveform at Full Load

Start-Up from Shutdown

Short-Circuit and Recovery

VIN = 48V

Burst Mode OPERATION

FIGURE 14 CIRCUIT

200µs/DIV

VOUT

2V/DIV

500mA/DIV

VRUN

5V/DIV

7101 G30

VIN = 48V

PULSE–SKIPPING MODE

FIGURE 14 CIRCUIT

100µs/DIV

VOUT

2V/DIV

500mA/DIV

7101 G31

VIN = 48V

ILOAD = 500mA

FIGURE 14 CIRCUIT

15µs/DIV

VSW

20V/DIV

EXTERNAL

CLOCK ON

PLLIN/MODE

1V/DIV

7101 G29

VIN = 48V

ILOAD = 1A

FIGURE 14 CIRCUIT

50ns/DIV

VSW

10V/DIV

7101 G28

Load Step Burst Mode Operation

Load Step Pulse-Skipping Mode

Load Step Forced Continuous

Mode

LOAD STEP = 50mA TO 500mA

VIN = 48V

FIGURE 14 CIRCUIT

40µs/DIV

VOUT

100mV/DIV

500mA/DIV

7101 G25

LOAD STEP = 50mA TO 500mA

VIN = 48V

FIGURE 14 CIRCUIT

40µs/DIV

VOUT

100mV/DIV

500mA/DIV

7101 G26

LOAD STEP = 50mA TO 500mA

VIN = 48V

FIGURE 14 CIRCUIT

40µs/DIV

VOUT

100mV/DIV

500mA/DIV

7101 G27

LT7101 Datasheet(PDF) 8 Page - Analog Devices

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