LT8580
26
8580fa
For more information www.linear.com/LT8580
Typical applicaTions
1.2MHz Inverting Converter Generates –48V Output From 12V Input
Switching Waveforms
Efficiency and Power Loss
Start-Up Waveforms
C
OUT
2.2µF
V
OUT
–48V
70mA
L1
150µH
L2
330µH
C1
1µF
D1
576k
V
IN
12V
V
IN
SW
8580 TA04a
LT8580
619k
20.5k
69.8k
SHDN
GND
FBX
VCSYNC
SSRT
4.7nF
47pF
0.33µF
C
IN
1µF
C2
2.2µF
L1: COOPER 150µH DR74-151
L2: COOPER 330µH DR74-331
D1: DIODES, INC. DFLS1100
C
IN
: 1µF, 50V, 0805, X7R
C
OUT
: 2.2µF, 100V, 1206, X7R
C1: 1µF, 100V, 0805, X7S
C2: 2.2µF, 100V, 1206, X7S
49.9Ω
LOAD CURRENT (mA)
0
20
EFFICIENCY (%)
POWER LOSS (mW)
30
40
50
50
90
8580 TA04b
40 602010 30 70
60
70
80
200
560
800
1040
680
320
440
920
EFFICIENCY
POWER LOSS
V
OUT
20mV/DIV
AC-COUPLED
V
SW
20V/DIV
I
L1
+ I
L2
200mA/DIV
8580 TA04c
V
OUT
10V/DIV
V
SW
20V/DIV
I
L1
+ I
L2
200mA/DIV
8580 TA04d
