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參數(shù)資料
| 型號： | LT1071 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 射頻放大器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 265K |
| 代理商： | LT1071 |
3
LT1070/LT1071
ELECTRICAL CHARACTERISTICS
SYMBOL
V
FB
PARAMETER
Flyback Reference Voltage
CONDITIONS
I
FB
= 50
μ
A
MIN
15
14
4.5
TYP
16.3
MAX
17.6
18.0
8.5
0.03
650
70
70
UNITS
V
V
V
G
Change in Flyback Reference Voltage
Flyback Reference Voltage Line Regulation
Flyback Amplifier Transconductance (g
m
)
Flyback Amplifier Source and Sink Current
0.05
≤
I
FB
≤
1mA
I
FB
= 50
μ
A, 3V
≤
V
IN
≤
V
MAX
(Note 3)
I
C
=
±
10
μ
A
V
C
= 0.6V, I
FB
= 50
μ
A (Source)
V
C
= 0.6V, I
FB
= 50
μ
A (Sink)
3V
≤
V
IN
≤
V
MAX
,
I
SW
= 1.5mA
(LT1070/LT1071)
(LT1070HV/LT1071HV)
LT1070
LT1071
LT1070
LT1071
Duty Cycle
≤
50%, T
J
≥
25
°
C
Duty Cycle
≤
50%, T
J
< 25
°
C
Duty Cycle = 80% (Note 5)
Duty Cycle
≤
50%, T
J
≥
25
°
C
Duty Cycle
≤
50%, T
J
< 25
°
C
Duty Cycle = 80% (Note 5)
6.8
0.01
300
32
40
%/V
μ
mho
150
15
25
G
G
μ
A
μ
A
B
V
Output Switch Breakdown Voltage
G
G
65
75
90
90
0.15
0.30
8
4
V
V
V
SAT
Output Switch “On” Resistance (Note 4)
G
G
0.24
0.50
Control Voltage to Switch Current
Transconductance
Switch Current Limit (LT1070)
A/V
A/V
I
LIM
G
G
G
5
5
4
10
11
10
5.0
5.5
5.0
35
A
A
A
A
A
A
Switch Current Limit (LT1071)
G
G
G
2.5
2.5
2.0
I
IN
I
SW
f
Supply Current Increase During
Switch “On” Time
Switching Frequency
25
mA/A
35
33
90
40
45
47
97
kHz
kHz
%
μ
s
μ
A
mV
mV
G
DC (Max)
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode Supply Current
Shutdown Mode Threshold Voltage
92
1.5
100
150
3V
≤
V
IN
≤
V
MAX
, V
C
= 0.05V
3V
≤
V
IN
≤
V
MAX
250
250
300
100
50
G
V
IN
= 15V, V
C
= 0.5V, V
FB
= V
REF
, output pin open unless otherwise specified.
The
G
denotes the specifications which apply over the full operating
temperature range.
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
≈
1
μ
s. This limits the maximum input voltage during short-circuit conditions,
in he buck and nverting modes only to
≈
35V. Normal (unshorted) conditions
are not affected. Mask changes are being implemented which will reduce
minimum “on” time to
≤
1
μ
s, 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 =
– R
L
t f V
IN
– V
F
I
LIMIT
t = Minimum “on” time of LT1070/LT1071 in current limit,
≈
1
μ
s
f = Operating frequency (40kHz)
V
F
= Forward voltage of external catch diode at I
LIMIT
I
LIMIT
= Current limit of LT1070 (
≈
8A), LT1071 (
≈
4A)
R
L
= Internal series resistance of inductor
Note 3:
V
MAX
= 55V for LT1070HV and LT1071HV to avoid switch
breakdown.
Note 4:
Measured with V
C
in hi clamp, V
FB
= 0.8V. I
SW
= 4A for LT1070
and 2A for LT1071.
Note 5:
For duty cycles (DC) between 50% and 80%, minimum
guaranteed switch current is given by I
LIM
= 3.33 (2 – DC) for the
LT1070 and I
LIM
= 1.67 (2 – DC) for the LT1071.
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