Datasheet

16
LT1619
1619fa
Figure 17a. 5V to –48V Cuk Converter
LOAD CURRENT (mA)
10
79
EFFICIENCY (%)
81
83
85
87
100 1000
1619 F17b
90
89
80
82
84
86
88
V
IN
= 5.25V
V
IN
= 4.75V
V
IN
= 5V
Figure 17b. Efficiency of the 5V to –48V Cuk
TYPICAL APPLICATIO S
U
10µF
SUD45N05-20L
50V, 0.018Ω
43nC
1µF
T1
•
4.7µF
FILM
22nF
T1: COILTRONICS CTX02-14261, EFD20-3F3, 6 WINDINGS EACH, 12µH
2.2nF
15Ω
1619 F17a
30Ω
220pF
2N5210
36k
1.1k
+
470µF
35V
SANYO MV-GX
–48V/0.5A
+
470µF
35V
SANYO MV-GX
S/S
FB
V
C
GND
8
7
6
5
1
2
3
4
V
IN
DRV
GATE
SENSE
• •
•
•
•
4.7µF
FILM
MBRS340T3
MBRS340T3
1500µF
6.3V
SANYO MV-GX
1N749
4.3V
V
IN
4.75V TO
5.25V
2N5210
10.5k
1%
12k1M
0.007Ω
432k
1%
LT1619
+