Datasheet

LT3958
6
3958f
INTV
CC
Line Regulation
INTV
CC
Dropout Voltage
vs Current, Temperature
INTV
CC
vs Temperature INTV
CC
Load Regulation
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–50
7.0
INTV
CC
(V)
7.1
7.2
7.3
7.4
0
50
75
–25
25
100
125
3958 G13
INTV
CC
LOAD (mA)
0
6.8
7
7.1
7.2
7.3
10
20 25
6.9
5
15
3958 G14
INTV
CC
VOLTAGE (V)
V
IN
= 8V
V
IN
(V)
0
INTV
CC
VOLTAGE (V)
7.25
7.20
20 30
50
10
40
60 70 80
7.15
7.10
7.30
3958 G15
INTV
CC
LOAD (mA)
0
DROPOUT VOLTAGE (mV)
700
600
800
400
500
200
300
4
2
6810
100
0
900
3958 G16
125°C
25°C
0°C
–40°C
75°C
Internal Switch On-Resistance
vs Temperature
TEMPERATURE (°C)
–50
ON-RESISTANCE (mΩ)
120
140
160
100
80
–25 250 50 75 100 125
20
0
60
180
40
3958 G17
Internal Switch On-Resistance
vs INTV
CC
SEPIC Typical Start-Up
Waveforms
SEPIC FBX Frequency Foldback
Waveforms During Overcurrent
INTV
CC
(V)
4
ON-RESISTANCE (mΩ)
98
100
96
94
6789
5
1110 12
92
90
88
102
3958 G18
5ms/DIV
SEE TYPICAL APPLICATION: 10V TO 60V INPUT,
12V OUTPUT SEPIC CONVERTER
V
OUT
5V/DIV
I
L1A
+ I
L1B
2A/DIV
3958 G19
V
IN
= 24V
50µs/DIV
V
OUT
10V/DIV
V
SW
20V/DIV
I
L1A
+ I
L1B
2A/DIV
3958 G20
V
IN
= 24V
SEE TYPICAL APPLICATION: 10V TO 60V INPUT,
12V OUTPUT SEPIC CONVERTER