LT1572CS Ver la hoja de datos (PDF) - Linear Technology
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LT1572CS Datasheet PDF : 12 Pages
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LT1572
ELECTRICAL CHARACTERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, output pin open, unless otherwise noted.
SYMBOL PARAMETER
Control Pin Threshold
CONDITIONS
Duty Cycle = 0
Normal/Flyback Threshold
on Feedback Pin
VFB
Flyback Reference Voltage
(Note 3)
Change in Flyback Reference
Voltage
Flyback Reference Voltage
Line Regulation (Note 3)
Flyback Amplifier
Transconductance (gm)
Flyback Amplifier Source
and Sink Current
BV
Output Switch Breakdown
Voltage (Note 4)
VSAT
Output Switch
“On” Resistance (Note 1)
Control Voltage to Switch
Current Transconductance
ILIM
Switch Current Limit
∆IIN
Supply Current Increase
∆ISW During Switch On-Time
f
Switching Frequency
IFB = 50µA
0.05 ≤ IFB ≤ 1mA
IFB = 50µA
7V ≤ VIN ≤ VMAX
∆IC = ±10µA
VC = 0.6V, Source
IFB = 50µA, Sink
3V ≤ VIN ≤ 40V, ISW = 1.5mA
Duty Cycle = 50%, TJ ≥ 25°C
Duty Cycle = 50%, TJ < 25°C
Duty Cycle = 80% (Note 2)
DCMAX
Maximum Switch Duty Cycle
Shutdown Mode
Supply Current
Shutdown Mode
Threshold Voltage
Flyback Sense Delay Time (Note 3)
3V ≤ VIN ≤ 40V
VC = 0.05V
3V ≤ VIN ≤ 40V
MIN TYP MAX UNITS
0.8 0.9 1.08
V
q
0.6
1.25
V
0.4 0.45 0.54
V
15.0 16.3 17.6
V
q 14.0
18.0
V
4.5 6.8 9
V
0.01 0.03
%/ V
150 300 500
µmho
q
15 32 70
µA
q
25 40 70
µA
q
60 80
V
q
0.60 1.00
Ω
2
A/ V
q 1.25
3.0
q 1.25
3.5
q 1.00
2.5
25 35
A
A
A
mA/A
88 100 112
kHz
q
85
115
kHz
q
80 90 95
%
100 250
µA
100 150 250
mV
q
50
300
mV
1.5
µs
DIODE
PARAMETER
Forward Voltage (Note 5)
Reverse Leakage (Note 5)
Diode Thermal Resistance
CONDITIONS
If = 200mA
If = 500mA
If = 1A
VR = 5V, TJ = 25°C
VR = 5V, TJ = 75°C
VR = 20V, TJ = 25°C
VR = 20V, TJ = 75°C
(Note 6)
MIN TYP MAX UNITS
q
0.45 0.57
V
q
0.52 0.65
V
q
0.55 0.70
V
1
5
µA
25 100
µA
3
15
µA
70 300
µA
90
°C/W
3
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