LT1952-1(RevD) 데이터 시트보기 (PDF) - Linear Technology

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LT1952-1
(Rev.:RevD)

Single Switch Synchronous Forward Controller

Linear Technology 

LT1952/LT1952-1

ELECTRICAL CHARACTERISTICS 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.

PARAMETER

VIN ON (LT1952)

VIN OFF (LT1952)

VIN HYSTERESIS (LT1952)

VIN ON (LT1952-1)

VIN OFF (LT1952-1)

VIN HYSTERESIS (LT1952-1)

VREF

Output Voltage

Line Regulation

Load Regulation

OSCILLATOR

Frequency: fOSC

Minimum Programmable fOSC

Maximum Programmable fOSC

SYNC Input Resistance

SYNC Switching Threshold

SYNC Frequency/fOSC

fOSC Line Reg

VROSC

ERROR AMPLIFIER

FB Reference Voltage

FB Input Bias Current

Open Loop Voltage Gain

Unity Gain Bandwidth

COMP Source Current

COMP Sink Current

COMP Current (Disabled)

COMP High Level: VOH

COMP Active Threshold

COMP Low Level: VOL

CURRENT SENSE

ISENSE Maximum Threshold

ISENSE Input Current (Duty Cycle = 0%)

ISENSE Input Current (Duty Cycle = 80%)

OC Threshold

OC Input Current

Default Blanking Time

Adjustable Blanking Time

VBLANK

CONDITIONS

MIN

l

l

l 3.75

l

l

l 0.95

TYP

14.25

8.75

5.5

7.75

6.5

1.25

MAX

15.75

9.25

6.75

8.13

6.82

UNITS

V

V

V

V

V

V

I(VREF) = 0μA

I(VREF) = 0μA, 10V < VIN < 25V

0μA < I(VREF) < 2.5mA

l 2.425 2.5 2.575

V

1

10

mV

1

10

mV

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

l 165

200

240

kHz

ROSC = 365k, FB = 1V

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

80

100 120

kHz

440

500

560

kHz

18

kΩ

FB = 1V

1.5

2.2

V

FB = 1V (Note 7)

1.25

1.5

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

SS_MAXDC = 1.84V

0.05 0.33

%/V

ROSC Pin voltage

1

V

10V < VIN < 25V, VOL + 0.2V < COMP < VOH – 0.2 l 1.201 1.226 1.250

V

FB = FB Reference Voltage

–75 –200

nA

VOL + 0.2V < COMP < VOH – 0.2

(Note 6)

65

85

dB

3

MHz

FB = 1V, COMP = 1.6V

–4

–9

mA

COMP = 1.6V

4

10

mA

FB = VREF, COMP = 1.6V

FB = 1V, I(COMP) = –250μA

FB = 1V, SOUT Duty Cycle > 0 %

18

23

28

μA

2.7

3.2

V

0.7

0.8

V

I(COMP) = 250μA

0.15

0.4

V

COMP = 2.5V, FB = 1V

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

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

COMP = 2.5V, FB = 1V

(OC = 100mV)

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

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

197

220

243

mV

–8

μA

– 35

μA

98

107 116

mV

–50 –100

nA

180

ns

540

ns

1

V

19521fd

3

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