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LT1572CS Datasheet(PDF) 3 Page - Linear Technology

No. de pieza LT1572CS
Descripción Electrónicos  100kHz, 1.25A Switching Regulator with Catch Diode
PDF  12 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
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LT1572CS Datasheet(HTML) 3 Page - Linear Technology

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LT1572
ELECTRICAL C
C
HARA TERISTICS V
IN = 15V, VC = 0.5V, VFB = VREF, output pin open, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Control Pin Threshold
Duty Cycle = 0
0.8
0.9
1.08
V
q
0.6
1.25
V
Normal/Flyback Threshold
0.4
0.45
0.54
V
on Feedback Pin
VFB
Flyback Reference Voltage
IFB = 50µA
15.0
16.3
17.6
V
(Note 3)
q
14.0
18.0
V
Change in Flyback Reference
0.05
≤ IFB ≤ 1mA
4.5
6.8
9
V
Voltage
Flyback Reference Voltage
IFB = 50µA
0.01
0.03
%/V
Line Regulation (Note 3)
7V
≤ VIN ≤ VMAX
Flyback Amplifier
∆IC = ±10µA
150
300
500
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 ≤ 40V, ISW = 1.5mA
q
60
80
V
Voltage (Note 4)
VSAT
Output Switch
q
0.60
1.00
Ω
“On” Resistance (Note 1)
Control Voltage to Switch
2A/V
Current Transconductance
ILIM
Switch Current Limit
Duty Cycle = 50%, TJ ≥ 25°C
q
1.25
3.0
A
Duty Cycle = 50%, TJ < 25°C
q
1.25
3.5
A
Duty Cycle = 80% (Note 2)
q
1.00
2.5
A
∆IIN
Supply Current Increase
25
35
mA/A
∆ISW
During Switch On-Time
f
Switching Frequency
88
100
112
kHz
q
85
115
kHz
DCMAX
Maximum Switch Duty Cycle
q
80
90
95
%
Shutdown Mode
3V
≤ VIN ≤ 40V
100
250
µA
Supply Current
VC = 0.05V
Shutdown Mode
3V
≤ VIN ≤ 40V
100
150
250
mV
Threshold Voltage
q
50
300
mV
Flyback Sense Delay Time (Note 3)
1.5
µs
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Forward Voltage (Note 5)
If = 200mA
q
0.45
0.57
V
If = 500mA
q
0.52
0.65
V
If = 1A
q
0.55
0.70
V
Reverse Leakage (Note 5)
VR = 5V, TJ = 25°C1
5
µA
VR = 5V, TJ = 75°C
25
100
µA
VR = 20V, TJ = 25°C3
15
µA
VR = 20V, TJ = 75°C
70
300
µA
Diode Thermal Resistance
(Note 6)
90
°C/W
DIODE



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