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LT1508I Datasheet

  • LT1508I

  • Linear Technology [Power Factor and PWM Controller(Voltage ...

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LT1508
ELECTRICAL CHARACTERISTICS
Maximum operating voltage (V
MAX
) = 25V, V
CC
= 18V, R
SET
= 15k to GND, C
SET
= 1nF to GND, I
AC
= 100碌A, I
SENSE
= 0V, CA
OUT
= 3.5V,
VA
OUT
= 5V, OVP = V
REF
. No load on any outputs unless otherwise noted.
PARAMETER
Current Amplifier (PFC Section)
Current Amp Offset Voltage
I
SENSE
Bias Current
Current Amp Voltage Gain
Current Amp Unity-Gain Bandwidth
Current Amp Output High
Current Amp Output Low
Current Amp Short-Circuit Current
Input Range, I
SENSE
, M
OUT
(Linear Operation)
Reference
Reference Output Voltage
V
REF
Load Regulation
V
REF
Line Regulation
V
REF
Short-Circuit Current
V
REF
Worst Case
Current Limit
PK
LIM
Offset Voltage
PK
LIM
Input Current
PK
LIM
to GTDR Propagation Delay
Multiplier
Multiplier Output Current
Multiplier Output Current Offset
Multiplier Maximum Output Current
Multiplier Gain Constant (Note 1)
I
AC
Input Resistance
Oscillator
Oscillator Frequency
C
SET
Ramp Peak-to-Peak Amplitude
C
SET
Ramp Valley Voltage
Overvoltage Comparator (PFC Section)
Comparator Trip Voltage Ratio (V
TRIP
/ V
REF
)
Hysteresis
OVP Bias Current
OVP Propagation Delay
Gate Drivers (GTDR1 and GTDR2)
Max Output Voltage
Output High
Output Low (Device Unpowered)
Output Low (Device Active)
Peak Output Current
Rise and Fall Time
Max Duty Cycle (PFC)
Max Duty Cycle (PWM) (Note 2)
CONDITIONS
q
q
MIN
TYP
鹵1
鈥?25
110
3
8.5
1.1
8
MAX
鹵4
鈥?250
UNITS
mV
nA
dB
MHz
V
V
mA
V
V
mV
mV
mA
V
mV
碌A
ns
碌A
碌A
碌A
V
鈥?
k鈩?/div>
kHz
kHz
V
V
80
q
q
7.2
3
鈥?0.3
7.39
CA
OUT
= 0V
q
q
2
17
1
7.60
20
50
7.68
25
鈥?100
I
REF
= 0mA, T
A
= 25擄C
鈥?5mA < I
REF
< 0mA
11.5V < V
CC
< V
MAX
V
REF
= 0V
Load, Line, Temperature
q
q
q
q
鈥?20
12
7.32
鈥?25
7.50
5
5
28
7.5
PK
LIM
= 鈥?0.1V
PK
LIM
Falling from 50mV to 鈥?50mV
I
AC
= 100碌A, R
SET
= 15k
R
AC
= 1M from I
AC
to GND
I
AC
= 450碌A, R
SET
= 15k, VA
OUT
= 7V, M
OUT
= 0V
I
AC
from 50碌A to 1mA
R
SET
= 15k, C
SET
= 1000pF
R
SET
= 15k, C
SET
= 1500pF
q
鈥?50
400
35
鈥?0.05
鈥?260
0.035
25
100
68
4.7
1.3
1.05
0.35
0.2
100
15
0.9
0.5
0.2
2
25
96
q
q
鈥?286
15
鈥?0.5
鈥?235
35
115
78
5.0
1.55
1.06
1
q
q
85
58
4.35
1.15
1.04
q
OVP = 7.5V
q
V
碌A
ns
V
V
V
V
V
A
ns
%
%
0mA Load, 18V < V
CC
鈥?200mA Load, 11.5V
鈮?/div>
V
CC
鈮?/div>
15V
V
CC
= 0V, 50mA Load (Sinking)
200mA Load (Sinking)
10mA Load
10nF from GTDR to GND
1nF from GTDR to GND
q
q
q
q
q
12
V
CC
鈥?3.0
17.5
1.5
1
0.4
90
44
50
3

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