LT1725IS Просмотр технического описания (PDF) - Linear Technology
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LT1725IS Datasheet PDF : 28 Pages
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LT1725
ELECTRICAL CHARACTERISTICS The ● 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.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
Gate Output
VGATE
Output High Level
Output Low Level
IGATE
Output Sink Current in Shutdown, VUVLO = 0V
tr
Rise Time
tf
Fall Time
Current Amplifier
IGATE = 100mA
IGATE = 500mA
IGATE = 100mA
IGATE = 500mA
VGATE = 2V
CL = 1000pF
CL = 1000pF
● 11.5
12.1
● 11.0
11.8
●
0.3
0.45
●
0.6
1.0
● 1.2
2.5
30
30
VC
VISENSE
Control Pin Threshold
Switch Current Limit
Duty Cycle = Min
Duty Cycle ≤ 30%
Duty Cycle ≤ 30%
Duty Cycle = 80%
0.90
1.12
1.25
● 0.80
1.35
220
250
270
● 200
280
220
∆VISENSE/∆VC
0.30
Timing
f
Switching Frequency
COSCAP
tON
tED
tEN
Rt
Oscillator Capacitor Value
Minimum Switch On Time
Flyback Enable Delay Time
Minimum Flyback Enable Time
Timing Resistor Value
Maximum Switch Duty Cycle
Load Compensation
COSCAP = 100pF
(Note 2)
RtON = 50k
RENDLY = 50k
RMENAB = 50k
(Note 2)
90
● 80
33
24
● 85
100
115
125
200
200
200
200
200
90
Sense Offset Voltage
2
5
Current Gain Factor
0.80
0.95
1.05
UVLO Function
VUVLO
IUVLO
UVLO Pin Threshold
UVLO Pin Bias Current
3V Output Function
VUVLO = 1.2V
VUVLO = 1.3V
● 1.21
1.25
1.29
– 0.25
+ 0.1
+ 0.25
– 4.50
– 3.5
– 2.50
VREF
Reference Output Voltage
Output Impedance
ILOAD = 1mA
● 2.8
3.0
3.2
10
Current Limit
●8
15
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.
UNITS
V
V
V
V
mA
ns
ns
V
V
mV
mV
mV
mV
kHz
kHz
pF
ns
ns
ns
kΩ
%
mV
mV
V
µA
µA
V
Ω
mA
1725fa
3
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