LT1082 データシートの表示（PDF） - Linear Technology
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LT1082 Datasheet PDF : 12 Pages
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LT1082
ELECTRICAL CHARACTERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, output pin open, unless otherwise specified.
SYMBOL
IQ
f
BV
VFB
VSAT
ILIM
∆IIN
∆ISW
DCMAX
PARAMETER
Supply Current
Control Pin Threshold
Normal/Flyback Threshold
on Feedback Pin
Switching Frequency
Output Switch Breakdown Voltage
Control Voltage to Switch
Current Transconductance
Flyback Reference Voltage
Change in Flyback Reference Voltage
Flyback Reference Voltage Line Regulation
Flyback Amplifier Transconductance (gm)
Flyback Amplifier Source
and Sink Current
Output Switch “On” Resistance (Note 1)
Switch Current Limit
(LT1082C)
Switch Current Limit
(LT1082I)
Switch Current Limit
(LT1082M)
Supply Current Increase
During Switch-On Time
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode Supply Current
Shutdown Mode
Threshold Voltage
CONDITIONS
3V ≤ VIN ≤ VMAX, VC = 0.6V
Duty Cycle = 0
q
q
800µA ≥ IFB ≥ 450µA
3V ≤ VIN ≤ VMAX, ISW = 1.5mA
q
IFB = 60µA
q
60µA ≤ IFB ≤ 200µA
IFB = 60µA, 3V ≤ VIN ≤ VMAX
∆IC = ±10µA
VC = 0.6V Source
q
IFB = 60µA Sink
q
ISW = 0.7A (LT1082C), ISW = 0.5A (LT1082M) q
Duty Cycle = 20%
q
Duty Cycle ≤ 50%
q
Duty Cycle = 80% (Note 2)
q
Duty Cycle = 20%
q
Duty Cycle ≤ 50%
q
Duty Cycle = 80% (Note 2)
q
Duty Cycle = 20%
q
Duty Cycle ≤ 50%
q
Duty Cycle = 80% (Note 2)
q
3V ≤ VIN ≤ VMAX, VC = 0.05V
3V ≤ VIN ≤ VMAX
q
MIN TYP MAX
4.5 7.0
0.7 0.9 1.1
0.5
1.25
0.58 0.67 0.8
50 60 70
45
75
12
100 115
1.5
17 18.6 20.5
16
21.5
3.5 4.6 6.5
0.01 0.03
150 300 500
15 32
70
30 50
90
0.8 1.2
1.07
2.6
1.0
2.6
0.8
2.4
0.85
2.8
0.8
2.8
0.65
2.6
0.75
3.0
0.7
3.0
0.6
2.8
35
45
85 92
97
1.5
120 350
70 150 250
50
300
UNITS
mA
V
V
V
kHz
kHz
kHz
V
A/V
V
V
V
%/V
µmho
µA
µA
Ω
A
A
A
A
A
A
A
A
A
mA /A
%
µs
µA
mV
mV
The q denotes the specifications which apply over the operating
temperature range.
Note 1: Measured with VC in hi clamp, VFB = 0.8V.
Note 2: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current decreases linearly.
3
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