LT3752 datasheet(5/48 Pages) LINER

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LT8311

8311f

For more information www.linear.com/LT8311

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, VINTVCC = 8V, PMODE = 5V, CCG = CFG = 100pF, unless

otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Inverting DC Gain From COMP Pin to

OPTO Pin

(∆VOPTO/∆VCOMP), 1.290V ≤ COMP ≤ 1.310V

–5

V/V

(∆VOPTO/∆VCOMP), 1.490V ≤ COMP ≤ 1.510V

–5.9

V/V

(∆VOPTO/∆VCOMP), 1.890V ≤ COMP ≤ 1.910V

–6.2

V/V

Opto-Driver –3dB Bandwidth

No Load (Note 5)

400

kHz

Opto-Driver Output Swing Low

FB = 1V, COMP = SS = OPTO = Open

0.5

0.85

Opto-Driver Output Swing High

VIN = 3.7V, FB = 1.5V, COMP = SS = Open, IOPTO = 10mA

VIN – 1.7 VIN – 1.4

VIN = 30V, FB = 1.5V, COMP = SS = Open, IOPTO = 10mA

5.2

6.5

Opto-Driver Output Short-Circuit Current VIN = 30V, FB = 1.5V, COMP = SS = Open, OPTO = 0V (Note 6)

10.5

Opto-Driver Output Sink Current

FB = 1V, OPTO = 1.2V (Note 7)

200

300

420

µA

Internal Linear Regulator

INTVCC Regulation Voltage

No Load

6.5

7.5

INTVCC Load Regulation

(∆VINTVCC/∆IINTVCC), 0A ≤ IINTVCC ≤ 20mA

1.8

mV/mA

INTVCC UVLO Rising

4.6

4.8

INTVCC UVLO Falling

4.1

4.3

INTVCC OVLO Rising

16.5

17.5

INTVCC OVLO Falling

INTVCC Current Limit

INTVCC > IINTVCC_UVLO_RISING (= 4.6V)

INTVCC < IINTVCC_UVLO_FALLING (= 4.3V)

INTVCC Dropout Voltage

VIN = 6V, IINTVCC = 10mA, Not Switching

400

CG and FG Gate Drivers

Driver Output Rise Time

CCG = CFG = 3.3nF, INTVCC = 8V (Note 4)

Driver Output Fall Time

CCG = CFG = 3.3nF, INTVCC = 8V (Note 4)

Driver Output High Voltage

VINTVCC

– 0.2

Driver Output Low Voltage

0.7

PMODE Selection

PMODE Trip Voltage

PMODE Ramp Up

Hysteresis

1.2

1.4

PMODE Input Current

PMODE = 18V

µA

Preactive Mode (Tie PMODE to 0V)

Preactive Mode Operating

Frequency Range

100

300

kHz

CSW High Trip Voltage

CSW Ramp Up

1.2

1.4

CSW High Input Current

CSW = 150V (Note 7)

250

500

µA

CSW Low Trip Voltage

CSW Ramp Down

–250

–150

–50

FSW Trip Voltage

1.2

1.4

FSW High Input Current

FSW = 150V (Note 7)

250

500

µA

CG Falling Edge to CSW Rising Edge

Prediction Delay

CSW = 150kHz (Note 10), FSW = 0V, CSP = –500mV

100

300

CG Falling Edge Delay to FG Rising Edge CSW = 150kHz (Note 10), FSW = 0V, CSP = –500mV

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