Datasheet

LT3761
5
3761f
Typical perFormance characTerisTics
FB Regulation Voltage (V
FB
)
vs Temperature V
ISP-ISN
Threshold vs FB Voltage
V
REF
Source Current
vs Temperature
V
REF
Voltage vs Temperature
Switching Frequency vs R
T
Switching Frequency
vs Temperature
V
ISP-ISN
Threshold
vs CTRL Voltage
V
ISP-ISN
Threshold
vs ISP Voltage
Full-Scale V
ISP-ISN
Threshold
vs Temperature
T
A
= 25°C, unless otherwise noted.
CTRL VOLTAGE (V)
0
–50
V
ISP-ISN
THRESHOLD (mV)
50
150
250
0.5 1 1.5
300
0
100
200
2
3761 G01
244
246
250
260
256
254
258
248
252
3761 G03
V
ISP-ISN
(mV)
TEMPERATURE (°C)
–50 0
50
75
–25
25
100
150125
CTRL = 2V
ISP = 48V
ISN = 0
3761 G04
V
FB
(V)
TEMPERATURE (°C)
1.240
1.250
1.265
1.260
1.270
1.245
1.255
–50 0
50
75
–25
25
100
150125
3761 G06
V
REF
SOURCE CURRENT (µA)
TEMPERATURE (°C)
150
160
190
180
200
170
–50 0 50 75–25 25 100 150125
3761 G07
V
REF
(V)
TEMPERATURE (°C)
1.98
2.00
2.02
2.06
2.05
2.04
1.99
2.01
2.03
–50 0
50
75
–25
25
100
150125
3761 G09
FREQUENCY (kHz)
TEMPERATURE (°C)
380
390
400
420
415
410
385
395
405
–50 0
50
75
–25
25
100
150125
R
T
= 25.5k
R
T
(kΩ)
SWITCHING FREQUENCY (kHz)
3761 G08
10 100
100
200
400
600
1000
900
800
300
500
700
ISP VOLTAGE (V)
240
V
ISP-ISN
THRESHOLD (mV)
250
260
245
255
3761 G02
0 20 40 60 80
3761 G05
V
ISP-ISN
(mV)
FB VOLTAGE (V)
0
100
250
200
300
50
150
1.20 1.22 1.231.21 1.24 1.261.25
CTRL = 2V
CTRL = 0.5V