LT1952 데이터 시트보기 (PDF) - Linear Technology
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LT1952 Datasheet PDF : 28 Pages
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LT1952/LT1952-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). 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
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
SOUT DRIVER
SOUT Clamp Voltage
SOUT Low Level
SOUT High Level
SOUT Active Pull-Off in Shutdown
SOUT to OUT (Rise) DELAY (tDELAY)
VDELAY
OUT DRIVER
OUT Rise Time
OUT Fall Time
OUT Clamp Voltage
OUT Low Level
OUT High Level
OUT Active Pull-Off in Shutdown
OUT Max Duty Cycle
OUT Max Duty Cycle Clamp
CONDITIONS
I(COMP) = 250µA
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
I(GATE) = 0µA, COMP = 2.5V, FB = 1V
I(GATE) = 25mA
I(GATE) = –25mA, VIN = 12V, COMP = 2.5V,
FB = 1V
VIN = 5V, SD_VSEC = 0V, SOUT = 1V
COMP = 2.5V, FB = 1V (Note 10)
RDELAY = 120k
FB = 1V, CL = 1nF (Notes 3, 6)
FB = 1V, CL = 1nF (Notes 3, 6)
I(GATE) = 0µA, COMP = 2.5V, FB = 1V
I(GATE) = 20mA
I(GATE) = 200mA
I(GATE) = –20mA, VIN = 12V, COMP = 2.5V,
FB = 1V
I(GATE) = –200mA, VIN = 12V, COMP = 2.5V,
FB = 1V
VIN = 5V, SD_VSEC = 0V, OUT = 1V
COMP = 2.5V, FB = 1V, RDELAY = 10k
(fOSC = 200kHz), VIN = 10V
SD_VSEC = 1.4V, SS_MAXDC = VREF
COMP = 2.5V, FB = 1V, RDELAY = 10k
(fOSC = 200kHz), VIN = 10V
SD_VSEC = 1.32V, SS_MAXDC = 1.84V
SD_VSEC = 2.64V, SS_MAXDC = 1.84V
MIN TYP MAX UNITS
0.15
0.4
V
197
220
243
mV
–8
µA
– 35
µA
98
107
116
mV
–50 –100
nA
180
ns
540
ns
1
V
10.5
12
13.5
V
0.5
0.75
V
10
V
1
mA
40
ns
120
ns
0.9
V
50
ns
30
ns
11.5
13
14.5
V
0.45 0.75
V
1.25
1.8
V
9.9
V
9.75
V
20
mA
83
90
%
63.5
72
80.5
%
25
33
41
%
19521fe
4
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