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參數(shù)資料
| 型號： | LT1171ITTR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封裝： | PLASTIC, TO-220, 5 PIN |
| 文件頁數(shù)： | 15/20頁 |
| 文件大小： | 278K |
| 代理商： | LT1171ITTR |
4
LT1170/LT1171/LT1172
117012ff
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Flyback Amplifier Source
VC = 0.6V
Source
q
15
32
70
A
and Sink Current
IFB = 50ASink
q
25
40
70
A
BV
Output Switch Breakdown
3V
≤ VIN ≤ VMAX,
LT1170/LT1171/LT1172
q
65
90
V
Voltage
ISW = 1.5mA
LT1170HV/LT1171HV/LT1172HV
q
75
90
V
LT1172S8
q
60
80
V
VSAT
Output Switch
LT1170
q
0.15
0.24
“On” Resistance (Note 3)
LT1171
q
0.30
0.50
LT1172
q
0.60
1.00
Control Voltage to Switch
LT1170
8
A/V
Current Transconductance
LT1171
4
A/V
LT1172
2
A/V
ILIM
Switch Current Limit
(LT1170)
Duty Cycle = 50%
TJ ≥ 25°C
q
510
A
Duty Cycle = 50%
TJ < 25°C
q
511
A
Duty Cycle = 80% (Note 4)
q
410
A
(LT1171)
Duty Cycle = 50%
TJ ≥ 25°C
q
2.5
5.0
A
Duty Cycle = 50%
TJ < 25°C
q
2.5
5.5
A
Duty Cycle = 80% (Note 4)
q
2.0
5.0
A
(LT1172)
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 4)
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
85
92
97
%
Shutdown Mode
3V
≤ VIN ≤ VMAX
100
250
A
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
s
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.
ELECTRICAL CHARACTERISTICS
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
≈ 0.6s. 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
s, 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.
(R)(IL) + Vf
(t)(f)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1171M | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
| LT1171MK | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
| LT1171MK/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
| LT1172 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
| LT1172C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators |
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