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参数资料
| 型号： | LT1071CT |
| 厂商： | Linear Technology |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ TO220-5 |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相，Cuk，回扫，正向转换器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 60 V |
| 输入电压： | 3 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 40kHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 100°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 成形引线 |
| 包装： | 管件 |
| 供应商设备封装： | TO-220-5 |
LT1070/LT1071
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T A = 25 ° C. V IN = 15V, V C = 0.5V, V FB = V REF , output pin open unless otherwise specified.
SYMBOL
V FB
PARAMETER
Flyback Reference Voltage
CONDITIONS
I FB = 50 μ A
MIN
15
TYP
16.3
MAX
17.6
UNITS
V
q
14
18.0
V
Change in Flyback Reference Voltage
Flyback Reference Voltage Line Regulation
Flyback Amplifier Transconductance (g m )
0.05 ≤ I FB ≤ 1mA
I FB = 50 μ A, 3V ≤ V IN ≤ V MAX (Note 3)
? I C = ± 10 μ A
4.5
150
6.8
0.01
300
8.5
0.03
650
V
%/V
μ mho
Flyback Amplifier Source and Sink Current
V C = 0.6V, I FB = 50 μ A (Source)
V C = 0.6V, I FB = 50 μ A (Sink)
q
q
15
25
32
40
70
70
μ A
μ A
B V
Output Switch Breakdown Voltage
3V ≤ V IN ≤ V MAX , I SW = 1.5mA
(LT1070/LT1071)
(LT1070HV/LT1071HV)
q
q
65
75
90
90
V
V
V SAT
Output Switch “On” Resistance (Note 4)
LT1070
LT1071
q
q
0.15
0.30
0.24
0.50
?
?
Control Voltage to Switch Current
Transconductance
LT1070
LT1071
8
4
A/V
A/V
I LIM
? I IN
? I SW
f
Switch Current Limit (LT1070)
Switch Current Limit (LT1071)
Supply Current Increase During
Switch “On” Time
Switching Frequency
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)
q
q
q
q
q
q
5
5
4
2.5
2.5
2.0
35
25
40
10
11
10
5.0
5.5
5.0
35
45
A
A
A
A
A
A
mA/A
kHz
q
33
47
kHz
DC (Max)
Maximum Switch Duty Cycle
90
92
97
%
Flyback Sense Delay Time
1.5
μ s
Shutdown Mode Supply Current
3V ≤ V IN ≤ V MAX , V C = 0.05V
100
250
μ A
Shutdown Mode Threshold Voltage
3V ≤ V IN ≤ V MAX
q
100
50
150
250
300
mV
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
≈ 1 μ s. 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 ≤ 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:
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.
R=
t ? f ? V IN – V F
I LIMIT
– R L
10701fe
3
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