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LT1269CS データシート(PDF) 3 Page - Linear Technology

部品番号 LT1269CS
部品情報  4A High Efficiency Switching Regulators
PDF  8 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LT1269CS データシート(HTML) 3 Page - Linear Technology

  LT1269CS Datasheet HTML 1Page - Linear Technology LT1269CS Datasheet HTML 2Page - Linear Technology LT1269CS Datasheet HTML 3Page - Linear Technology LT1269CS Datasheet HTML 4Page - Linear Technology LT1269CS Datasheet HTML 5Page - Linear Technology LT1269CS Datasheet HTML 6Page - Linear Technology LT1269CS Datasheet HTML 7Page - Linear Technology LT1269CS Datasheet HTML 8Page - Linear Technology  
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3
LT1271/LT1269
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Control Pin Threshold
Duty Cycle = 0
0.7
0.9
1.08
V
q
0.5
1.25
V
Normal/Flyback Threshold
0.4
0.45
0.54
V
on Feedback Pin
VFB
Flyback Reference Voltage
IFB = 50µA
15
16.3
17.6
V
q
14
18
V
VFB
Change in Flyback
0.05
≤ IFB ≤ 1mA
4.5
6.8
8.5
V
Reference Voltage
Flyback Reference Voltage
IFB = 50µA
0.01
0.03
%/V
Line Regulation
3V
≤ VIN ≤ VMAX
Flyback Amplifier
∆IC = ±10µA
150
300
650
µmho
Transconductance (gm)
Flyback Amplifier Source
VC = 0.6V
Source
q
15
32
70
µA
and Sink Current
IFB = 50µA
Sink
q
25
40
70
µA
BV
Output Switch Breakdown
3V
≤ VIN ≤ VMAX
q
60
75
V
Voltage
ISW = 1.5mA
VSAT
Output Switch (Note 1)
q
0.2
0.33
Ω
“On” Resistance
Control Voltage to Switch
6.4
A/V
Current Transconductance
ILIM
Switch Current Limit (Note 2)
Duty Cycle = 50%
q
48
A
Duty Cycle = 80%
q
3.2
8
A
∆IIN
Supply Current Increase
25
40
mA/A
∆ISW
During Switch On-Time
f
Switching Frequency
LT1271
q
50
60
70
kHz
LT1269
q
85
100
115
kHz
DC (max)
Maximum Switch Duty Cycle
LT1271
85
92
95
%
LT1269
80
90
95
%
Flyback Sense Delay Time
1.5
µs
Shutdown Mode
3V
≤ VIN ≤ VMAX, VC = 0.05V
100
400
µA
Supply Current
Shutdown Mode
3V
≤ VIN ≤ VMAX
100
150
250
mV
Threshold Voltage
q
50
300
mV
ELECTRICAL C
C
HARA TERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, switch pin open, unless otherwise noted.
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.



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