LT1170 View Datasheet(PDF) - Linear Technology
Part Name
Description
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LT1170 Datasheet PDF : 20 Pages
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LT1170/LT1171/LT1172
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating tem-
perature range, otherwise specifications are at TA = 25°C. VIN = 15V, VC = 0.5V, VFB = VREF, output pin open, unless otherwise noted.
SYMBOL PARAMETER
VREF
Reference Voltage
IB
Feedback Input Current
gm
Error Amplifier
Transconductance
Error Amplifier Source or
Sink Current
Error Amplifier Clamp
Voltage
Reference Voltage Line
Regulation
AV
Error Amplifier Voltage Gain
Minimum Input Voltage (Note 5)
IQ
Supply Current
Control Pin Threshold
Normal/Flyback Threshold
on Feedback Pin
VFB
Flyback Reference Voltage
(Note 5)
Change in Flyback Reference
Voltage
Flyback Reference Voltage
Line Regulation (Note 5)
Flyback Amplifier
Transconductance (gm)
Flyback Amplifier Source
and Sink Current
BV
Output Switch Breakdown
Voltage
VSAT
Output Switch
“On” Resistance (Note 3)
Control Voltage to Switch
Current Transconductance
ILIM
Switch Current Limit (LT1170)
(LT1171)
(LT1172)
CONDITIONS
Measured at Feedback Pin
VC = 0.8V
q
VFB = VREF
q
∆IC = ±25µA
q
VC = 1.5V
q
Hi Clamp, VFB = 1V
Lo Clamp, VFB = 1.5V
3V ≤ VIN ≤ VMAX
q
VC = 0.8V
0.9V ≤ VC ≤ 1.4V
q
3V ≤ VIN ≤ VMAX, VC = 0.6V
Duty Cycle = 0
q
IFB = 50µA
q
0.05 ≤ IFB ≤ 1mA
IFB = 50µA
7V ≤ VIN ≤ VMAX
∆IC = ±10µA
VC = 0.6V
Source
q
IFB = 50µA
Sink
q
3V ≤ VIN ≤ VMAX, LT1170/LT1171/LT1172
q
ISW = 1.5mA
LT1170HV/LT1171HV/LT1172HV q
LT1172S8
q
LT1170
q
LT1171
q
LT1172
q
LT1170
LT1171
LT1172
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
TJ ≥ 25°C q
TJ < 25°C q
q
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
TJ ≥ 25°C q
TJ < 25°C q
q
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
TJ ≥ 25°C q
TJ < 25°C q
q
MIN
1.224
1.214
3000
2400
150
120
1.80
0.25
TYP
1.244
1.244
350
4400
200
0.38
MAX
1.264
1.274
750
1100
6000
7000
350
400
2.30
0.52
0.03
500 800
2.6 3.0
6
9
0.8 0.9 1.08
0.6
1.25
0.4 0.45 0.54
15.0 16.3 17.6
14.0
18.0
4.5 6.8 9
0.01 0.03
150 300 650
15 32 70
25 40 70
65 90
75 90
60 80
0.15 0.24
0.30 0.50
0.60 1.00
8
4
2
5
10
5
11
4
10
2.5
5.0
2.5
5.5
2.0
5.0
1.25
3.0
1.25
3.5
1.00
2.5
UNITS
V
V
nA
nA
µmho
µmho
µA
µA
V
V
%/V
V/V
V
mA
V
V
V
V
V
V
%/V
µmho
µA
µA
V
V
V
Ω
Ω
Ω
A/V
A/V
A/V
A
A
A
A
A
A
A
A
A
3
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