LT1269 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1269 Datasheet PDF : 8 Pages
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LT1271/LT1269
ELECTRICAL CHARACTERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, switch pin open, unless otherwise noted.
SYMBOL
VFB
VFB
BV
VSAT
ILIM
∆IIN
∆ISW
f
DC (max)
PARAMETER
Control Pin Threshold
Normal/Flyback Threshold
on Feedback Pin
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 Breakdown
Voltage
Output Switch (Note 1)
“On” Resistance
Control Voltage to Switch
Current Transconductance
Switch Current Limit (Note 2)
Supply Current Increase
During Switch On-Time
Switching Frequency
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode
Supply Current
Shutdown Mode
Threshold Voltage
CONDITIONS
Duty Cycle = 0
MIN
0.7
q
0.5
0.4
IFB = 50µA
0.05 ≤ IFB ≤ 1mA
15
q
14
4.5
IFB = 50µA
3V ≤ VIN ≤ VMAX
∆IC = ±10µA
150
VC = 0.6V
IFB = 50µA
Source
q
15
Sink
q
25
3V ≤ VIN ≤ VMAX
ISW = 1.5mA
q
60
q
Duty Cycle = 50%
Duty Cycle = 80%
q
4
q
3.2
LT1271
LT1269
LT1271
LT1269
q
50
q
85
85
80
3V ≤ VIN ≤ VMAX, VC = 0.05V
3V ≤ VIN ≤ VMAX
100
q
50
TYP
MAX
0.9
1.08
1.25
0.45
0.54
16.3
17.6
18
6.8
8.5
0.01
0.03
300
650
32
70
40
70
75
0.2
0.33
6.4
8
8
25
40
60
70
100
115
92
95
90
95
1.5
100
400
150
250
300
UNITS
V
V
V
V
V
V
%/V
µmho
µA
µA
V
Ω
A/V
A
A
mA/A
kHz
kHz
%
%
µs
µA
mV
mV
The q denotes the specifications which apply over the full operating
temperature range.
Note 1: Measured with VC in hi clamp, VFB = 0.8V.
Note 2: For duty cycles (DC) between 50% and 85%, minimum
guaranteed switch current is given by ILIM = 2.67 (2 – DC).
Note 3: Minimum input voltage.
3
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