LT3517
ELECTRICAL CHARACTERISTICS
PARAMETER
TGEN Input High Voltage
TGEN Input Low Voltage
TGEN Pin Bias Current
V
REF
Pin Voltage
V
REF
Pin Voltage Line Regulation
Gate Turn-On Delay
Gate Turn-Off Delay
Top Gate Drive V
GS
(V
ISP
– V
TG
)
TGEN = 5V
I
REF
= –100μA
3V < V
IN
< 40V
C
LOAD
= 1nF Between ISP and TG
C
LOAD
= 1nF Between ISP and TG
V
ISP
= 24V, TGEN = 5V
PWM = 0V
200
200
7
0
0.3
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2) V
IN
= 5V,
SHDN
= 5V, PWM = 5V unless otherwise noted.
CONDITIONS
MIN
1.5
0.4
100
1.96
2
200
2.04
0.03
TYP
MAX
UNITS
V
V
μA
V
%/V
ns
ns
V
V
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 LT3517E 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
LT3517I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3517H is guaranteed over the full –40ºC to
150ºC operating junction temperature range. Operating lifetime is derated
at junction temperatures greater than 125ºC.
Note 3:
Absolute maximum voltage at V
IN
,
SHDN,
PWM and TGEN pins
is 40V for nonrepetitive 1 second transients and 30V for continuous
operation.
Note 4:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
reliability.
TYPICAL PERFORMANCE CHARACTERISTICS
V
ISP
– V
ISN
Threshold vs V
CTRL
120
2.0
V
IN
= 5V
V
ISP
= 24V
100 V
C
= 1V
T
A
= 25°C
80
60
40
20
0
0
0.2
0.4
0
0.6 0.8 1.0
V
CTRL
(V)
1.2
1.4
1.6
0
T
A
= 25°C
20
40
60
DUTY CYCLE (%)
80
100
3517 G02
Switch Current Limit
vs Duty Cycle
10000
OSCILLATOR FREQUENCY (kHz)
Oscillator Frequency vs R
T
T
A
= 25°C
V
ISP
– V
ISN
THRESHOLD (mV)
SWITCH CURRENT LIMIT (A)
1.5
1.0
1000
0.5
100
1
10
R
T
(kΩ)
100
3518 G03
3518 G01
3517fa
4
LINER [ LINEAR TECHNOLOGY ]
