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参数资料
| 型号： | LT1508ISW#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | POWER FACTOR CONTROLLER WITH POST REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | 0.300 INCH, PLASTIC, SO-20 |
| 文件页数： | 10/16页 |
| 文件大小： | 300K |
| 代理商： | LT1508ISW#TR |
3
LT1508
ELECTRICAL C
C
HARA TERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Current Amplifier (PFC Section)
Current Amp Offset Voltage
q
±1
±4mV
ISENSE Bias Current
q
– 25
– 250
nA
Current Amp Voltage Gain
80
110
dB
Current Amp Unity-Gain Bandwidth
3
MHz
Current Amp Output High
q
7.2
8.5
V
Current Amp Output Low
q
1.1
2
V
Current Amp Short-Circuit Current
CAOUT = 0V
q
38
17
mA
Input Range, ISENSE, MOUT (Linear Operation)
q
–0.3
1
V
Reference
Reference Output Voltage
IREF = 0mA, TA = 25°C
7.39
7.50
7.60
V
VREF Load Regulation
– 5mA < IREF < 0mA
5
mV
VREF Line Regulation
11.5V < VCC < VMAX
q
–20
5
20
mV
VREF Short-Circuit Current
VREF = 0V
q
12
28
50
mA
VREF Worst Case
Load, Line, Temperature
q
7.32
7.5
7.68
V
Current Limit
PKLIM Offset Voltage
q
–25
25
mV
PKLIM Input Current
PKLIM = – 0.1V
q
– 50
– 100
A
PKLIM to GTDR Propagation Delay
PKLIM Falling from 50mV to – 50mV
400
ns
Multiplier
Multiplier Output Current
IAC = 100A, RSET = 15k
35
A
Multiplier Output Current Offset
RAC = 1M from IAC to GND
q
– 0.05
– 0.5
A
Multiplier Maximum Output Current
IAC = 450A, RSET = 15k, VAOUT = 7V, MOUT = 0V
q
– 286
– 260
– 235
A
Multiplier Gain Constant (Note 1)
0.035
V–2
IAC Input Resistance
IAC from 50A to 1mA
15
25
35
k
Oscillator
Oscillator Frequency
RSET = 15k, CSET = 1000pF
q
85
100
115
kHz
RSET = 15k, CSET = 1500pF
q
58
68
78
kHz
CSET Ramp Peak-to-Peak Amplitude
4.35
4.7
5.0
V
CSET Ramp Valley Voltage
1.15
1.3
1.55
V
Overvoltage Comparator (PFC Section)
Comparator Trip Voltage Ratio (VTRIP/VREF)
q
1.04
1.05
1.06
Hysteresis
0.35
V
OVP Bias Current
OVP = 7.5V
q
0.2
1
A
OVP Propagation Delay
100
ns
Gate Drivers (GTDR1 and GTDR2)
Max Output Voltage
0mA Load, 18V < VCC
q
12
15
17.5
V
Output High
– 200mA Load, 11.5V
≤ VCC ≤ 15V
q
VCC – 3.0
V
Output Low (Device Unpowered)
VCC = 0V, 50mA Load (Sinking)
q
0.9
1.5
V
Output Low (Device Active)
200mA Load (Sinking)
q
0.5
1
V
10mA Load
q
0.2
0.4
V
Peak Output Current
10nF from GTDR to GND
2
A
Rise and Fall Time
1nF from GTDR to GND
25
ns
Max Duty Cycle (PFC)
90
96
%
Max Duty Cycle (PWM) (Note 2)
44
50
%
Maximum operating voltage (VMAX) = 25V, VCC = 18V, RSET = 15k to GND, CSET = 1nF to GND, IAC = 100A, ISENSE = 0V, CAOUT = 3.5V,
VAOUT = 5V, OVP = VREF. No load on any outputs unless otherwise noted.
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