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LT3757 Arkusz danych(PDF) 3 Page - Linear Technology

Numer części LT3757
Szczegółowy opis  Boost, Flyback, SEPIC and Inverting Controller
PDF  36 Pages
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Producent  LINER [Linear Technology]
Strona internetowa  http://www.linear.com
Logo LINER - Linear Technology

LT3757 Arkusz danych(HTML) 3 Page - Linear Technology

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LT3757

3757fb
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, SENSE = 0V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VINOperatingRange
2.9
40
V
VINShutdownIQ
SHDN/UVLO=0V
SHDN/UVLO=1.15V
0.1
1
6
µA
µA
VINOperatingIQ
VC=0.3V,RT=41.2k
1.6
2.2
mA
VINOperatingIQwithInternalLDODisabled
VC=0.3V,RT=41.2k,INTVCC=7.5V
280
400
µA
SENSECurrentLimitThreshold
l
100
110
120
mV
SENSEInputBiasCurrent
CurrentOutofPin
–65
µA
Error Amplifier
FBXRegulationVoltage(VFBX(REG))
VFBX>0V(Note3)
VFBX<0V(Note3)
l
l
1.569
–0.816
1.6
–0.80
1.631
–0.784
V
V
FBXOvervoltageLockout
VFBX>0V(Note4)
VFBX<0V(Note4)
6
7
8
11
10
14
%
%
FBXPinInputCurrent
VFBX=1.6V(Note3)
VFBX=–0.8V(Note3)
–10
70
100
10
nA
nA
Transconductancegm(∆IVC/∆VFBX)
(Note3)
230
µS
VCOutputImpedance
(Note3)
5
MΩ
VFBXLineRegulation[∆VFBX/(∆VIN•VFBX(REG))]
VFBX>0V,2.9V<VIN<40V(Notes3,7)
VFBX<0V,2.9V<VIN<40V(Notes3,7)
0.002
0.0025
0.056
0.05
%/V
%/V
VCCurrentModeGain(∆VVC/∆VSENSE)
5.5
V/V
VCSourceCurrent
VFBX=0V,VC=1.5V
–15
µA
VCSinkCurrent
VFBX=1.7V
VFBX=–0.85V
12
11
µA
µA
Oscillator
SwitchingFrequency
RT=41.2ktoGND,VFBX=1.6V
RT=140ktoGND,VFBX=1.6V
RT=10.5ktoGND,VFBX=1.6V
270
300
100
1000
330
kHz
kHz
kHz
RTVoltage
VFBX=1.6V
1.2
V
MinimumOff-Time
220
ns
MinimumOn-Time
220
ns
SYNCInputLow
0.4
V
SYNCInputHigh
1.5
V
SSPull-UpCurrent
SS=0V,CurrentOutofPin
–10
µA
Low Dropout Regulator
INTVCCRegulationVoltage
l
7
7.2
7.4
V
INTVCCUndervoltageLockoutThreshold
FallingINTVCC
UVLOHysteresis
2.6
2.7
0.1
2.8
V
V
INTVCCOvervoltageLockoutThreshold
16
17.5
V
INTVCCCurrentLimit
VIN=40V
VIN=15V
30
40
95
55
mA
mA
INTVCCLoadRegulation(∆VINTVCC/ VINTVCC)
0<IINTVCC<20mA,VIN=8V
–0.9
–0.5
%
INTVCCLineRegulation∆VINTVCC/(VINTVCC•∆VIN)
8V<VIN<40V
0.008
0.03
%/V
DropoutVoltage(VIN–VINTVCC)
VIN=6V,IINTVCC=20mA
400
mV



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