LT8580
27
8580fa
For more information www.linear.com/LT8580
Typical applicaTions
Start-Up Waveforms
VFD (Vacuum Fluorescent Display) Power Supply Switches at 1MHz
Danger High Voltage! Operation by High Voltage Trained Personnel Only
Efficiency and Power Loss
(V
IN
= 12V with Load on V
OUT3
)
C1
1µF
V
OUT1
60V
60mA*
V
OUT3
180V
20mA*
V
OUT2
120V
30mA*
L1
68µH
C2
1µF
D1
698k
V
IN
9V TO 16V
V
IN
SW
8580 TA05a
LT8580
487k
22.1k
84.5k
SHDN
GND
FBX
VCSYNC
SSRT
4.7nF
330pF
0.47µF
C
IN
1µF
C4
1µF
C3
1µF
C5
1µF
D3
D2
L1: WÜRTH 68µH WE-LQS 74404084680
D1-D5: DIODES, INC. DFLS1100
C
IN
: 1µF, 100V, 1206, X7R
C1-C5: 1µF, 100V, 1206, X7S
*MAX TOTAL OUTPUT POWER 3.5W
22Ω
D4
22Ω
D5
OUTPUT POWER (W)
0
20
EFFICIENCY (%)
POWER LOSS (mW)
30
40
50
2.5
90
2 310.5 1.5 3.5
60
70
80
400
640
800
960
720
480
560
880
EFFICIENCY
POWER LOSS
V
OUT3
50V/DIV
V
OUT2
50V/DIV
V
OUT1
50V/DIV
I
L1
200mA/DIV
2ms/DIV
8580 TA05c
