LT3756 datasheet(8/31 Pages) AD

8 / 31 page

LT8355-1

Rev. A

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TYPICAL PERFORMANCE CHARACTERISTICS T

A = 25°C, unless otherwise noted.

FB Open LED Threshold vs

Temperature

SENSEP − SENSEN Current Limit

vs Temperature

SENSEP − SENSEN Current Limit

vs Duty Ratio

PWMTG Duty vs PWM Pin Voltage

PWMTG Duty vs Temperature

PWMTG Frequency vs

Temperature

PWMTG Frequency vs

Temperature

Minimum Off-Time vs CH1

Switching Frequency

Minimum Off-Time vs

Temperature

fSW1 = 400kHz

fSW1 = 100kHz

fSW1 = 2MHz

TEMPERATURE (°C)

–50 –25

75 100 125 150

100

120

140

160

180

200

8355-1 G36

fSW1 = 400kHz

TEMPERATURE (°C)

–50 –25

75 100 125 150

360

370

380

390

400

410

420

430

440

8355-1 G33

GATE PIN DUTY CYCLE (%)

0 10 20 30 40 50 60 70 80 90 100

100

105

110

115

120

8355-1 G30

fSW1 = 400kHz

CH1 SWITCHING FREQUENCY (Hz)

100k

100

125

150

175

200

8355-1 G35

VPWM = 0.511VREF

fSW1 = 400kHz

fSW1 = 2MHz

TEMPERATURE (°C)

–50 –25

75 100 125 150

9.4

9.6

9.8

10.0

10.2

10.4

10.6

8355-1 G32

fSW1 = 400kHz

20% DUTY

50% DUTY

80% DUTY

TEMPERATURE (°C)

–50 –25

75 100 125 150

100

105

110

115

120

8355-1 G29

fSW1 = 2MHz

TEMPERATURE (°C)

–50 –25

75 100 125 150

1.80

1.85

1.90

1.95

2.00

2.05

2.10

2.15

2.20

8355-1 G34

PWM PIN VOLTAGE (V)

0.5

0.7

0.9

1.1

1.3

1.5

0.5

100

8355-1 G31

VISP – VISN = 0V

TEMPERATURE (°C)

–50 –25

75 100 125 150

1.08

1.10

1.12

1.14

1.16

1.18

1.20

8355-1 G28

FALLING THRESHOLD

RISING THRESHOLD

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