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LT1172CK 数据表(PDF) 4 Page - Linear Technology

部件名 LT1172CK
功能描述  100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1172CK 数据表(HTML) 4 Page - Linear Technology

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4
LT1170/LT1171/LT1172
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
∆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
85
92
97
%
Shutdown Mode
3V
≤ VIN ≤ VMAX
100
250
µA
Supply Current
VC = 0.05V
Shutdown Mode
3V
≤ VIN ≤ VMAX
100
150
250
mV
Threshold Voltage
q
50
300
mV
Flyback Sense Delay Time (Note 5)
1.5
µs
Transformer designs will tolerate much higher input voltages because
leakage inductance limits rate of rise of current in the switch. These
designs must be evaluated individually to assure that current limit is well
controlled up to maximum input voltage.
Boost mode designs are never protected against output shorts because
the external catch diode and inductor connect input to output.
Note 3: Measured with VC in hi clamp, VFB = 0.8V. ISW = 4A for LT1170,
2A for LT1171, and 1A for LT1172.
Note 4: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by ILIM = 3.33 (2 – DC) for the LT1170,
ILIM = 1.67 (2 – DC) for the LT1171, and ILIM = 0.833 (2 – DC) for the
LT1172.
Note 5: Minimum input voltage for isolated flyback mode is 7V. VMAX =
55V for HV grade in fully isolated mode to avoid switch breakdown.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Minimum effective switch “on” time for the LT1170/71/72 (in current
limit only) is
≈ 0.6µs. This limits the maximum safe input voltage during an
output shorted condition. Buck mode and inverting mode input voltage during
an output shorted condition is limited to:
VIN (max, output shorted) = 15V +
buck and inverting mode
R = Inductor DC resistance
IL = 10A for LT1170, 5A for LT1171, and 2.5A for LT1172
Vf = Output catch diode forward voltage at IL
t = 0.6
µs, f = 100kHz switching frequency
Maximum input voltage can be increased by increasing R or Vf.
External current limiting such as that shown in AN19, Figure 39, will
provide protection up to the full supply voltage rating. C1 in Figure 39
should be reduced to 200pF.
Switch Current Limit vs Duty Cycle*
TEMPERATURE (
°C)
–75
–25
25
50
150
1170/1/2 G02
–50
0
75 100 125
2.9
2.8
2.7
2.6
2.5
2.4
2.3
SWITCH CURRENT = 0A
SWITCH CURRENT = IMAX
Minimum Input Voltage
Switch Saturation Voltage
DUTY CYCLE (%)
0
16
12
8
4
0
40
1170/1/2 G01
20 30
50
60 70 80
90 100
25
°C
125
°C
–55
°C
10
* DIVIDE VERTICAL SCALE BY TWO FOR
LT1171, BY FOUR FOR LT1172.
SWITCH CURRENT (A)*
0
8
1170/1/2 G03
1
2
3
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
45
6
7
25
°C
150
°C
–55
°C
100
°C
* DIVIDE CURRENT BY TWO FOR
LT1171, BY FOUR FOR LT1172.
(R)(IL) + Vf
(t)(f)
The q denotes the specifications which apply over the full operating tem-
perature range, otherwise specifications are at TA = 25°C. VIN = 15V, VC = 0.5V, VFB = VREF, output pin open, unless otherwise noted.
TYPICAL PERFOR A CE CHARACTERISTICS
ELECTRICAL CHARACTERISTICS


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