LT1952IGN datasheet(3/24 Pages) LINER

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LT1952/LT1952-1

19521fd

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN ON (LT1952)

14.25

15.75

VIN OFF (LT1952)

8.75

9.25

VIN HYSTERESIS (LT1952)

3.75

5.5

6.75

VIN ON (LT1952-1)

7.75

8.13

VIN OFF (LT1952-1)

6.5

6.82

VIN HYSTERESIS (LT1952-1)

0.95

1.25

VREF

Output Voltage

I(VREF) = 0μA

2.425

2.5

2.575

Line Regulation

I(VREF) = 0μA, 10V < VIN < 25V

Load Regulation

0μA < I(VREF) < 2.5mA

OSCILLATOR

Frequency: fOSC

ROSC = 178k, FB = 1V, SS_MAXDC = 1.84V

165

200

240

kHz

Minimum Programmable fOSC

Maximum Programmable fOSC

ROSC = 365k, FB = 1V

ROSC = 64.9k, COMP = 2.5V, SD_VSEC = 2.64V

440

100

500

120

560

kHz

SYNC Input Resistance

kΩ

SYNC Switching Threshold

FB = 1V

1.5

2.2

SYNC Frequency/fOSC

FB = 1V (Note 7)

1.25

1.5

fOSC Line Reg

FB = 1V, ROSC = 178k; 10V < VIN < 25V,

SS_MAXDC = 1.84V

0.05

0.33

%/V

VROSC

ROSC Pin voltage

ERROR AMPLIFIER

FB Reference Voltage

10V < VIN < 25V, VOL + 0.2V < COMP < VOH – 0.2

1.201

1.226

1.250

FB Input Bias Current

FB = FB Reference Voltage

–75

–200

Open Loop Voltage Gain

VOL + 0.2V < COMP < VOH – 0.2

Unity Gain Bandwidth

(Note 6)

MHz

COMP Source Current

FB = 1V, COMP = 1.6V

–4

–9

COMP Sink Current

COMP = 1.6V

COMP Current (Disabled)

FB = VREF, COMP = 1.6V

μA

COMP High Level: VOH

FB = 1V, I(COMP) = –250μA

2.7

3.2

COMP Active Threshold

FB = 1V, SOUT Duty Cycle > 0 %

0.7

0.8

COMP Low Level: VOL

I(COMP) = 250μA

0.15

0.4

CURRENT SENSE

ISENSE Maximum Threshold

COMP = 2.5V, FB = 1V

197

220

243

ISENSE Input Current (Duty Cycle = 0%)

ISENSE Input Current (Duty Cycle = 80%)

COMP = 2.5V, FB = 1V (Note 4)

–8

–35

μA

OC Threshold

COMP = 2.5V, FB = 1V

107

116

OC Input Current

(OC = 100mV)

–50

–100

Default Blanking Time

COMP = 2.5V, FB = 1V, RBLANK = 40k (Note 10)

180

Adjustable Blanking Time

COMP = 2.5V, FB = 1V, RBLANK = 120k

540

VBLANK

The

l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. COMP = open, FB = 1.4V, ROSC = 178k, SYNC = 0V, SS_MAXDC = VREF, VREF

= 0.1μF, SD_VSEC = 2V, BLANK = 121k, DELAY = 121k, ISENSE = 0V, OC = 0V, OUT = 1nF, VIN = 15V, SOUT = open, unless otherwise speciﬁed.

ELECTRICAL CHARACTERISTICS

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