LT1952-1 데이터 시트보기 (PDF) - Linear Technology
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LT1952-1 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
CONDITIONS
MIN TYP MAX UNITS
PWM CONTROLLER
Operational Input Voltage
VIN Quiescent Current
VIN Start-up Current (LT1952)
VIN Start-up Current (LT1952-1)
VIN Shutdown Current
SD_VSEC Threshold
SD_VSEC (ON) Current
SD_VSEC (OFF) Current
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
I(VREF) = 0µA
I(VREF) = 0µA, ISENSE = OC = Open
FB = 0V, SS_MAXDC = 0V (Notes 4, 9)
FB = 0V, SS_MAXDC = 0V (Notes 4, 9)
SD_VSEC = 0V
10V < VIN < 25V
SD_VSEC = SD_VSEC Threshold + 100mV
SD_VSEC = SD_VSEC Threshold – 100mV
E-, I-Grades
MP-Grade
I(VREF) = 0µA
I(VREF) = 0µA, 10V < VIN < 25V
0µA < I(VREF) < 2.5mA
l VIN OFF
25
V
5.2
6.5
mA
l
460
700
µA
l
400
575
µA
240
350
µA
l 1.261 1.32 1.379
V
0
µA
8.3
10
11.7
µA
l
14.25 15.75
V
l
8.75 9.25
V
l 3.75
5.5
6.75
V
l
7.75 8.13
V
l
7.75
8.3
V
l
6.5
6.82
V
l 0.95 1.25
V
l 2.425 2.5 2.575
V
1
10
mV
1
10
mV
Frequency: fOSC
Minimum Programmable fOSC
Maximum Programmable fOSC
SYNC Input Resistance
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
SYNC Switching Threshold
FB = 1V
1.5
2.2
V
SYNC Frequency/fOSC
fOSC Line Reg
VROSC
ERROR AMPLIFIER
FB = 1V (Note 7)
FB = 1V, ROSC = 178k; 10V < VIN < 25V,
SS_MAXDC = 1.84V
ROSC Pin voltage
1.25
1.5
0.05 0.33
%/V
1
V
FB Reference Voltage
FB Input Bias Current
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
Open Loop Voltage Gain
Unity Gain Bandwidth
VOL + 0.2V < COMP < VOH – 0.2
(Note 6)
65
85
dB
3
MHz
COMP Source Current
FB = 1V, COMP = 1.6V
–4
–9
mA
COMP Sink Current
COMP = 1.6V
4
10
mA
COMP Current (Disabled)
COMP High Level: VOH
COMP Active Threshold
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
19521fe
3
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