LT3782EUFD Просмотр технического описания (PDF) - Linear Technology
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LT3782EUFD Datasheet PDF : 20 Pages
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LT3782
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at TA = 25°C. VCC = 13V, RSET = 80k, no load on any outputs, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Overall
Supply Voltage (VCC)
Supply Current (IVCC)
Shutdown
l
6
40
V
VC ≤ 0.5V (Switching Off), VCC ≤ 40V
11
16
mA
RUN Threshold
l 2.3
2.45
2.6
V
RUN Threshold Hysteresis
80
mV
Supply Current in Shutdown
RUN Pin Input Current
Voltage Amplifier gm
Reference Voltage (VREF)
1V ≤ RUN ≤ VREF, VCC ≤ 30V
RUN ≤ 0.3V, VCC ≤ 30V
VRUN = 2.3V
0.4
0.65
mA
40
90
μA
l
–0.5
–2
μA
2.42 2.44 2.464
V
l 2.4
2.488
V
Transconductance
Input Current IFB
VC High
VC Low
Source Current IVC
Sink Current IVC
VC Threshold for Switching Off (BGATE1, BGATE2 Low)
Soft-Start Current ISS
Current Amplifier CA1, CA2
VVC = 1V, ΔIVC = ±2μA
VFB = VREF
IVC = 0
IVC = 0
VVC = 0.7V – 1V, VFB = VREF – 100mV
VVC = 0.7V – 1V, VFB = VREF + 100mV
VSS = 0.1V – 2.8V
l 200
260
370
μmho
l
0.2
0.6
μA
1.5
V
0.35
0.4
V
8
11
14
μA
13
20
28
μA
l 0.3
V
6
10
15
μA
Voltage Gain ΔVC /ΔVSENSE
Current Limit (VSENSE1+ – VSENSE1–) (VSENSE2+ – VSENSE2–)
Input Current (ISENSE1+, ISENSE1–, ISENSE2+, ISENSE2–)
Oscillator
ΔVSENSE = 0V
4
50
62
80
mV
60
μA
Switching Frequency
Synchronization Pulse Threshold on SYNC Pin
Synchronization Frequency Range
(Note: Operation Switching Frequency Equals
Half of the Synchronization Frequency)
VRSET
Maximum Duty Cycle
Duty Cycle Limit
DCL Pin Input Current
RSET = 130k
RSET = 80k
RSET = 40k
Rising Edge VSYNC
RSET = 130k
RSET = 80k
RSET = 40k
RSET = 80k
VFB = VREF – 25mV, RSET > 80k
RSET = 40k
RSET = 80k, VDCL ≤ 0.3V
VDCL = 1.2V
VDCL = VRSET
VDCL ≤ 0.3V
l 130
154
177
kHz
l 212
250
288
kHz
l 386
465
533
kHz
0.8
1.2
2
V
180
240
kHz
290
392
kHz
550
715
kHz
2.3
V
l 90
94
%
l 83
90
%
50
%
75
%
Max Duty Cycle
l
–0.1 –0.3
μA
3782fg
3
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