Datasheet

LT3579/LT3579-1
35
35791fa
For more information www.linear.com/LT3579
V
IN
9V TO 16V
V
OUT2
100V
330mA*
V
OUT1
67V
500mA*
L1
10µH
C4
2.2µF
× 2
C3
2.2µF
× 2
C5
2.2µF
× 2
C6
2.2µF
× 2
C2
2.2µF
× 3
C1
2.2µF
× 3
C
IN
: 10µF, 25V, X7R, 1210
C1-C6: 2.2µF, 50V, X7R, 1210
D1-D6: DIODES INC SBR2A40P1
D7: CENTRAL SEMI CMDSH-3TR
D8: CENTRAL SEMI CMDZ5237B-LTZ
D9: DIODES INC MBRM360
L1: WÜRTH WE-PD 7447710
M1: SILICONIX SI7461DP
M1**
100k
C
IN
10µF
SW1 SW2
V
IN
FB
CLKOUT
V
C
SSGND
GATEFAULT
SYNC
RT
SHDN
LT3579
35791 TA17
383k 6.5k**
34k
470pF2.2µF
27pF
86.6k
536k
V
IN
D2
D8**
8.2V
D3
D5
D4
D6
D1
D9**
*MAX TOTAL
OUTPUT POWER
22W (V
IN
= 9V)
27W (V
IN
= 12V)
33W (V
IN
= 16V)
**OPTIONAL FOR OUTPUT
SHORT CIRCUIT PROTECTION
D7**
TYPICAL APPLICATION
VFD (Vacuum Fluorescent Display) Power Supply Switches at 1MHz
Efficiency and Power Loss (V
IN
= 12V) Cycle-to-Cycle
TOTAL OUTPUT POWER (W)
0
65
EFFICIENCY (%)
POWER LOSS (W)
80
85
75
70
90
0
3
4
2
1
5
5 20 25 3010
35791 TA18
15
1µs/DIV
V
OUT1
2V/DIV
AC COUPLED
SW1
20V/DIV
V
OUT2
2V/DIV
AC COUPLED
I
L
1A/DIV
35791
TA19
Danger High Voltage! Operation by High Voltage Trained Personnel Only