Datasheet

LT3511
3
3511fc
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3511E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3511I is guaranteed to meet performance specifications from –40°C to
125°C operating junction temperature range. The LT3511H is guaranteed
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Switching Frequency 40 kHz
T
C
Current into R
REF
R
TC
= 53.6k 9.5 µA
BIAS Pin Voltage Internally Regulated 3 3.1 3.2 V
to meet performance specifications from –40°C to 150°C operating
junction temperature range. The LT3511MP is guaranteed over the full
–55°C to 150°C operating junction range. High junction temperatures
degrade operating lifetimes. Operating lifetime is derated at junction
temperatures greater than 125°C.
Note 3: Current flows out of the R
REF
pin.
Note 4: The SW pin is rated to 150V for transients. Operating waveforms
of the SW pin should keep the pedestal of the flyback waveform below
100V as shown in Figure 5.
TYPICAL PERFORMANCE CHARACTERISTICS
Switch V
CESAT
Switch Current Limit Quiescent Current vs V
IN
Output Voltage Quiescent Current BIAS Pin Voltage
TEMPERATURE (°C)
–50
4.75
V
OUT
(V)
4.80
4.90
4.95
5.00
5.25
5.10
0
50
75
3511 G01
4.85
5.15
5.20
5.05
–25 25
100
125
150
V
IN
= 48V
TEMPERATURE (°C)
–50 –25
0
I
Q
(mA)
2
5
0
50
75
3511 G02
1
4
3
25
100
125 150
V
IN
= 24V
V
IN
= 48V
V
IN
= 100V
TEMPERATURE (°C)
–50
2.0
BIAS VOLTAGE (V)
2.5
3.0
3.5
4.0
–25 0 25 50
3511 G03
52105100157
V
IN
= 24V, 10mA
V
IN
= 24V, NO LOAD
SWITCH CURRENT (mA)
050
0
SWITCH V
CESAT
VOLTAGE (mV)
400
1000
100
200
250
3511 G04
200
800
600
150
300
350
TEMPERATURE (°C)
–50
CURRENT LIMIT (mA)
350
25
3511 G05
200
100
–25 0 50
50
0
400
300
250
150
52105100157
MINIMUM CURRENT LIMIT
MAXIMUM CURRENT LIMIT
VOLTAGE (V)
0
I
Q
(mA)
2
3
80
3511 G06
1
0
20
40
60
100
4
T
A
= 25°C, unless otherwise noted.