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LT1725IGN 数据表(PDF) 3 Page - Linear Technology

部件名 LT1725IGN
功能描述  General Purpose Isolated Flyback Controller
PDF  28 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1725IGN 数据表(HTML) 3 Page - Linear Technology

  LT1725IGN Datasheet HTML 1Page - Linear Technology LT1725IGN Datasheet HTML 2Page - Linear Technology LT1725IGN Datasheet HTML 3Page - Linear Technology LT1725IGN Datasheet HTML 4Page - Linear Technology LT1725IGN Datasheet HTML 5Page - Linear Technology LT1725IGN Datasheet HTML 6Page - Linear Technology LT1725IGN Datasheet HTML 7Page - Linear Technology LT1725IGN Datasheet HTML 8Page - Linear Technology LT1725IGN Datasheet HTML 9Page - Linear Technology Next Button
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3
LT1725
1725f
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: Component value range guaranteed by design.
Note 3: The VCC turn-on/turn-off voltages and hysteresis voltage are
proportional in magnitude to each other-guaranteed by design.
The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 14V, GATE open, VC = 1.4V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Current Amplifier
VC
Control Pin Threshold
Duty Cycle = Min
0.90
1.12
1.25
V
q
0.80
1.35
V
VISENSE
Switch Current Limit
Duty Cycle
≤ 30%
220
250
270
mV
Duty Cycle
≤ 30%
q
200
280
mV
Duty Cycle = 80%
220
mV
∆VISENSE/∆VC
0.30
mV
Timing
f
Switching Frequency
COSCAP = 100pF
90
100
115
kHz
q
80
125
kHz
COSCAP
Oscillator Capacitor Value
(Note 2)
33
200
pF
tON
Minimum Switch On Time
RtON = 50k
200
ns
tED
Flyback Enable Delay Time
RENDLY = 50k
200
ns
tEN
Minimum Flyback Enable Time
RMENAB = 50k
200
ns
Rt
Timing Resistor Value
(Note 2)
24
200
k
Ω
Maximum Switch Duty Cycle
q
85
90
%
Load Compensation
Sense Offset Voltage
25
mV
Current Gain Factor
0.80
0.95
1.05
mV
UVLO Function
VUVLO
UVLO Pin Threshold
q
1.21
1.25
1.29
V
IUVLO
UVLO Pin Bias Current
VUVLO = 1.2V
– 0.25
+ 0.1
+ 0.25
µA
VUVLO = 1.3V
– 4.50
– 3.5
– 2.50
µA
3V Output Function
VREF
Reference Output Voltage
ILOAD = 1mA
q
2.8
3.0
3.2
V
Output Impedance
10
Ω
Current Limit
q
815
mA



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