参数资料
| 型号： | LT1172MJ8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 8CERDIP |
| 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 ~ 40 V |
| 输入电压： | 3 V ~ 40 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 1.25A |
| 同步整流器： | 无 |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-CDIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-CERDIP |
LT1170/LT1171/LT1172
ELECTRICAL CHARACTERISTICS The l 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 noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V REF
I B
g m
Reference Voltage
Feedback Input Current
Error Amplifier Transconductance
Error Amplifier Source or Sink Current
Measured at Feedback Pin
V C = 0.8V
V FB = V REF
ΔI C = ±25μA
V C = 1.5V
l
l
l
l
1.224
1.214
3000
2400
150
120
1.244
1.244
350
4400
200
1.264
1.274
750
1100
6000
7000
350
400
V
V
nA
nA
μmho
μmho
μA
μA
Error Amplifier Clamp Voltage
Hi Clamp, V FB = 1V
1.80
2.30
V
Lo Clamp, V FB = 1.5V
0.25
0.38
0.52
V
Reference Voltage Line Regulation
3V ≤ V IN ≤ V MAX
l
0.03
%/V
V C = 0.8V
A V
Error Amplifier Voltage Gain
Minimum Input Voltage (Note 5)
0.9V ≤ V C ≤ 1.4V
l
500
800
2.6
3.0
V/V
V
I Q
Supply Current
3V ≤ V IN ≤ V MAX , V C = 0.6V
6
9
mA
Control Pin Threshold
Normal/Flyback Threshold on Feedback Pin
Duty Cycle = 0
l
0.8
0.6
0.4
0.9
0.45
1.08
1.25
0.54
V
V
V
V FB
Flyback Reference Voltage (Note 5)
Change in Flyback Reference Voltage
I FB = 50μA
0.05 ≤ I FB ≤ 1mA
l
15.0
14.0
4.5
16.3
6.8
17.6
18.0
9
V
V
V
Flyback Reference Voltage Line Regulation
I FB = 50μA
0.01
0.03
%/V
(Note 5)
7V ≤ V IN ≤ V MAX
Flyback Amplifier Transconductance (g m )
ΔI C = ±10μA
150
300
650
μmho
Flyback Amplifier Source and Sink Current
V C = 0.6V
I FB = 50μA
Source
Sink
l
l
15
25
32
40
70
70
mA
mA
BV
V SAT
Output Switch Breakdown Voltage
Output Switch “On” Resistance (Note 3)
3V ≤ V IN ≤ V MAX ,
I SW = 1.5mA
LT1170
LT1171
LT1172
LT1170/LT1171/LT1172
LT1170HV/LT1171HV/LT1172HV
LT1172S8
l
l
l
l
l
l
65
75
60
90
90
80
0.15
0.30
0.60
0.24
0.50
1.00
V
V
V
Ω
Ω
Ω
Control Voltage to Switch Current
Transconductance
LT1170
LT1171
LT1172
8
4
2
A/V
A/V
A/V
I LIM
Switch Current Limit (LT1170)
(LT1171)
(LT1172)
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
Duty Cycle = 50%
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
T J ≥ 25°C
T J < 25°C
T J ≥ 25°C
T J < 25°C
T J ≥ 25°C
T J < 25°C
l
l
l
l
l
l
l
l
l
5
5
4
2.5
2.5
2.0
1.25
1.25
1.00
10
11
10
5.0
5.5
5.0
3.0
3.5
2.5
A
A
A
A
A
A
A
A
A
ΔI IN
Supply Current Increase During Switch
25
35
mA/A
ΔI SW
On-Time
f
Switching Frequency
l
88
85
100
112
115
kHz
kHz
117012fg
4
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