參數(shù)資料
型號： LT1070HVCT#PBF06
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 11 A SWITCHING REGULATOR, 47 kHz SWITCHING FREQ-MAX, PZFM5
封裝： PLASTIC, TO-220, 5 PIN
文件頁數(shù)： 6/12頁
文件大小： 208K
代理商： LT1070HVCT#PBF06
10701fe
3
LT1070/LT1071
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VFB
Flyback Reference Voltage
IFB = 50A
15
16.3
17.6
V
q
14
18.0
V
Change in Flyback Reference Voltage
0.05
≤ IFB ≤ 1mA
4.5
6.8
8.5
V
Flyback Reference Voltage Line Regulation
IFB = 50A, 3V ≤ VIN ≤ VMAX (Note 3)
0.01
0.03
%/V
Flyback Amplifier Transconductance (gm)
IC = ±10A
150
300
650
mho
Flyback Amplifier Source and Sink Current
VC = 0.6V, IFB = 50A (Source)
q
15
32
70
A
VC = 0.6V, IFB = 50A (Sink)
q
25
40
70
A
BV
Output Switch Breakdown Voltage
3V
≤ VIN ≤ VMAX, ISW = 1.5mA
(LT1070/LT1071)
q
65
90
V
(LT1070HV/LT1071HV)
q
75
90
V
VSAT
Output Switch “On” Resistance (Note 4)
LT1070
q
0.15
0.24
LT1071
q
0.30
0.50
Control Voltage to Switch Current
LT1070
8
A/V
Transconductance
LT1071
4
A/V
ILIM
Switch Current Limit (LT1070)
Duty Cycle
≤ 50%, TJ ≥ 25°C
q
510
A
Duty Cycle
≤ 50%, TJ < 25°C
q
511
A
Duty Cycle = 80% (Note 5)
q
410
A
Switch Current Limit (LT1071)
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 5)
q
2.0
5.0
A
IIN
Supply Current Increase During
25
35
mA/A
ISW
Switch “On” Time
f
Switching Frequency
35
40
45
kHz
q
33
47
kHz
DC (Max)
Maximum Switch Duty Cycle
90
92
97
%
Flyback Sense Delay Time
1.5
s
Shutdown Mode Supply Current
3V
≤ VIN ≤ VMAX, VC = 0.05V
100
250
A
Shutdown Mode Threshold Voltage
3V
≤ VIN ≤ VMAX
100
150
250
mV
q
50
300
mV
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: Minimum switch “on” time for the LT1070/LT1071 in current limit is
≈1s. This limits the maximum input voltage during short-circuit conditions,
in the buck and inverting modes only, to
≈35V.Normal(unshorted)conditions
are not affected. Mask changes are being implemented which will reduce
minimum “on” time to
≤1s, increasing maximum short-circuit input voltage
above 40V. If the present LT1070/LT1071 (contact factory for package date
code) is being operated in the buck or inverting mode at high input voltages
and short-circuit conditions are expected, a resistor must be placed in series
with the inductor, as follows:
The value of the resistor is given by:
R =
– RL
t f VIN – VF
ILIMIT
t = Minimum “on” time of LT1070/LT1071 in current limit,
≈1s
f = Operating frequency (40kHz)
VF = Forward voltage of external catch diode at ILIMIT
ILIMIT = Current limit of LT1070 (≈8A), LT1071 (≈ 4A)
RL = Internal series resistance of inductor
Note 3: VMAX = 55V for LT1070HV and LT1071HV to avoid switch
breakdown.
Note 4: Measured with VC in hi clamp, VFB = 0.8V. ISW = 4A for LT1070
and 2A for LT1071.
Note 5: For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by ILIM = 3.33 (2 – DC) for the
LT1070 and ILIM = 1.67 (2 – DC) for the LT1071.
The q denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN = 15V, VC = 0.5V, VFB = VREF, output pin open unless otherwise specified.
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相關代理商/技術參數(shù)
參數(shù)描述
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